Статті в журналах з теми "Salinity New South Wales Murray-Darling Basin"

A 427-cm sediment core was extracted from Tareena Billabong, a Murray River floodplain wetland in the extreme south-west of New South Wales, Australia. Analysis of fossil diatoms and pollen, sediment 210Pb and 137Cs profiles and radiocarbon and luminescence dating reveal that Tareena Billabong has undergone substantial environmental change in its ~5000-year history. Shortly after its formation, the billabong was a freshwater lagoon with a diatom flora dominated by Synedra ulna and Planothidium lanceolatum. An increase in Aulacoseira granulata, a river plankton dominant today, reflects two phases of increased connectivity with the Murray River in the mid to late Holocene. A shift to lagoonal taxa after ~3000 years BP is attributed to water balance and river-flow changes, possibly associated with regional climate change. Importantly, it appears to have undergone an extended phase of increasing turbidity, and possibly wetland salinity, commencing ~3000 years BP. Sedimentation increased at least 15-fold in the European phase. Billabong salinity increased markedly soon after European settlement, reaching a peak in the late 1800s AD. While regulation then increased the degree of connection between the billabong with the River in the 1920s AD, salinity levels remained high. Increased salinity is revealed by increases in the diatom taxa Amphora spp., Cyclotella meneghiniana, Gyrosigma acuminatum, Planothidium delicatulum and Tryblionella hungarica and by declines in Casuarinaceae, Eucalyptus, Myriophyllum and Cyperaceae pollen. Tareena Billabong was subjected to considerable environmental pressures from the early stages of European settlement in terms of sediment load, hydrological change and salinity.

Due to a combination of river regulation, dryland salinity and irrigation return, lower River Murray floodplains (Australia) and associated wetlands are undergoing salinisation. It was hypothesised that salinisation would provide suitable conditions for the accumulation of sulfidic materials (soils and sediments enriched in sulfides, such as pyrite) in these wetlands. A survey of nine floodplain wetlands representing a salinity gradient from fresh to hypersaline determined that surface sediment sulfide concentrations varied from <0.05% to ~1%. Saline and permanently flooded wetlands tended to have greater sulfide concentrations than freshwater ones or those with more regular wetting–drying regimes. The acidification risk associated with the sulfidic materials was evaluated using field peroxide oxidations tests and laboratory measurements of net acid generation potential. Although sulfide concentration was elevated in many wetlands, the acidification risk was low because of elevated carbonate concentration (up to 30% as CaCO3) in the sediments. One exception was Bottle Bend Lagoon (New South Wales), which had acidified during a draw-down event in 2002 and was found to have both actual and potential acid sulfate soils at the time of the survey (2003). Potential acid sulfate soils also occurred locally in the hypersaline Loveday Disposal Basin. The other environmental risks associated with sulfidic materials could not be reliably evaluated because no guideline exists to assess them. These include the deoxygenation risk following sediment resuspension and the generation of foul odours during drying events. The remediation of wetland salinity in the Murray–Darling Basin will require that the risks associated with disturbing sulfidic materials during management actions be evaluated.

Accurate data on the distribution of the various types of sodic soils in New South Wales are not available. However, general observations suggest that large areas are affected by structural instability as a result of sodicity, particularly on grey clays and red-brown earths of the Murray-Darling Basin. There is a strong need for new sodicity surveys because the production of crops and pasture often is well below potential on these lands. Exchangeable sodium data on their own do not adequately describe sodic soil behaviour, so information is also required about related factors such as electrical conductivity, exchangeable magnesium, clay mineralogy, pH, calcium carbonate content, degree of remoulding, and the frequency of continuous stable macropores. Critical limits for sodicity that are used by soil management advisory services need to be redefined. Considerable research into the reclamation and management of sodic soils has occurred in the irrigation areas and rainfed cropping districts of the Murray-Darling Basin in New South Wales. Mined and by-product gypsum, and to a lesser extent lime, have been shown to greatly improve the physical condition and profitability of production from soils with a dispersive surface. However, the responses to these treatments are less likely to be economical when sodicity is confined to the subsoil. Adequate supplies of gypsum and lime are available in New South Wales, but further research is required to determine economically optimal and environmentally acceptable rates and frequencies of application, particle sizes and chemical compositions for different farming systems that utilize the various types of sodic soil.

The geologically complex eastern Australian coastal margin supports the highest taxonomic diversity of freshwater fishes on the continent. However, mechanisms leading to coastal biogeographic patterns are poorly understood. A 399-bp fragment of the hypervariable mtDNA control region was sequenced from populations of eel-tailed catfish (Tandanus tandanus) to determine their phylogeographic structure and to relate this to proposed biogeographic mechanisms and landform evolution. Genetic structure in Tandanus is complex, with haplotypes clustering into three lineages: a phylogenetically distant, northern Queensland clade that is probably a new species; a mid-northern New South Wales clade corresponding to the recently discovered ‘Bellinger’ Tandanus cryptic species; and a third ‘derived’ clade T. tandanus. Phylogenetic analyses suggest that eastern Australian Tandanus originally invaded freshwaters from the coast where volcanic activity in the north and increasing aridity from the Paleocene reduced inter-fluvial connections, causing genetic divergence of northern Queensland and mid-northern New South Wales populations. The haplotypes represented by Murray–Darling drainage T. tandanus were the most derived, indicating that this species originally evolved on the coast and subsequently colonised the Murray–Darling basin. Tandanus in eastern Australia is phylogenetically structured and possibly comprises three species in this region; a pattern potentially shared by other eastern Australian freshwater fishes.

The U-Pb ages of fine-grained zircon separated from 2 dust-dominated soils in the eastern highlands of south-eastern Australia and measured by ion microprobe (SHRIMP) revealed a characteristic age ‘fingerprint’ from which the source of the dust has been determined and by which it will be possible to assess the contribution of dust to other soil profiles. The 2 soils are dominated by zircon 400–600 and 1000–1200 Ma old, derived from Palaeozoic granites and sediments of the Lachlan Fold Belt, but also contain significant components 100–300 Ma old, characteristic of igneous rocks in the New England Fold Belt in northern New South Wales and Queensland. This pattern closely matches that of sediments of the Murray-Darling Basin, especially the Mallee dunefield, suggesting that weathering of rocks in the eastern highlands has contributed large quantities of sediment to the arid and semi-arid inland basins via internally draining rivers of the present and past Murray–Darling River systems, where it has formed a major source of dust subsequently blown eastwards and deposited in the highland soils of eastern Australia.

Nitre goosefoot (Chenopodium nitrariaceum (F.Muell.) is a woody shrub that occurs at the edges of floodplains and other intermittently flooded areas across the Murray–Darling Basin. No studies have been conducted on the hydrological requirements of nitre goosefoot, and the species is not considered in watering requirements of floodplain species of the Murray–Darling Basin. This study investigated the effects of simulated rainfall and depth and duration of experimental flooding on mortality, leaf production, biomass and seed production of nitre goosefoot. Nitre goosefoot plants were grown from seeds collected near Hillston, New South Wales, Australia. The plants were subjected to the following 14 hydrological treatments: dry (no water applied), rainfall (simulating rainfall conditions at Hillston) and 12 combinations of three water depths (10cm, 50cm, 75cm) with four durations of inundation (5 days, 10 days, 20 days, 40 days). The study found that nitre goosefoot plants survived flooding, providing plants were not totally submerged, leaf production increased during flooding and after drawdown, and leaf production, biomass and seeding were highest under shallow flooding for approximately 1 month. The results of the study allow the hydrological requirements of nitre goosefoot to be considered in environmental watering programs.

Changes in the phytoplankton population at Burtundy are described, based on data (1980-92) from the algal, water quality and flow monitoring programmes of the Murray-Darling Basin Commission; cell densities and community composition are discussed in relation to flow, turbidity, temperature and nutrients. Of 102 taxa from seven classes recorded in the 628 phytoplankton samples, only seven taxa occurred in >30% of samples and 55 taxa occurred in <I% of samples. Total cell densities remained below 10 000 cells mL-1 for around 70% of the study period. The population was characterized by the presence of Bacillariophyceae and Chlorophyceae and the irregular development of cyanobacterial blooms. Eight genera of cyanobacteria contributed to 17 population peaks exceeding 10 000 cells mL-1. Ten of these peaks occurred during a low-flow period from April 1985 to June 1988 when turbidity was usually less than 50 NTU, and two were recorded at river temperatures of less than 14°C. Total cell density and community composition had no apparent seasonal pattern but had five distinct phases related to flow and turbidity. Seasonal temperature cycles and availability of nutrients appear to be less important than flow and turbidity in determining the longer-term variations observed in the algal population.

Regional climactic variability coupled with an increasing demand on water has placed an even greater pressure on managers to understand the complex relationships between surface water and groundwater in the Murray–Darling Basin. Based on limited soil sampling combined with geophysical observations, past research has suggested that relic subsurface drainage features (also known as palæochannels) have a higher risk of deep drainage and lateral flow, particularly where water is impounded or applied as irrigation. The aim of this study was to investigate the hydrological behaviour of an irrigated 25-ha site in North-western New South Wales in more detail to predict deep drainage risk in the presence of palæochannel systems. Several years of direct and indirect observations, including soil sampling and groundwater measures, were collected. Coupling the field data with one- and two-dimensional water balance models revealed a more complex behaviour where a palæochannel functions like a large underground drain. In contrast to other studies, this study suggests that the actual palæochannel does not pose a higher drainage risk, but the combination of the palæochannels with the surroundings soils does have a higher deep drainage risk.

Banking water in aquifers during wet years for long-term storage then recovering it in drought is an application of managed aquifer recharge (MAR) that minimises evaporation losses. This requires a suitable aquifer for long-term storage of banked water and occasional periods when entitlements to surface water are available and affordable. This has been widely practised in Arizona and California but thus far not in Australia, in spite of severe impacts on agriculture, society, and the environment during recent droughts in the Murray–Darling Basin. This preliminary study based on a simple area exclusion analysis using six variables, some on a 90 m grid, over the 1 million km2 basin produced a first estimate of the order of 2–4 × 109 m3 of additional aquifer storage potential in surficial aquifers close to rivers. For 6 of the 23 catchments evaluated, banking capacity exceeded an average water depth of 0.3 m for the irrigated area. At one prospective site in the Macquarie River catchment in New South Wales, water banking operations at various scales were simulated using 55 years of historical monthly hydrologic data, with recharge and recovery triggered by dam storage levels. This showed that the estimated 300 × 106 m3 additional local aquifer capacity could be fully utilised with a recharge and recovery capacity of 6 × 106 m3/month, and recharge occurred in 67% of months and recovery in 7% of months. A novel simulation of water banking with recharge and recovery triggered by water trading prices using 11 years of data gave a benefit cost ratio of ≈ 2. Data showed that water availability for recharge was a tighter constraint on water banking than aquifer storage capacity at this location. The analysis reveals that water banking merits further consideration in the Murray–Darling Basin. Firstly, management across hydrologically connected systems requires accounting for surface water and groundwater entitlements and allocations at the appropriate scale, as well as developing equitable economic and regulatory arrangements. Of course, site-specific assessment of water availability and hydrogeological suitability would be needed prior to construction of demonstration projects to support full-scale implementation.

Hypotheses to explain the source of the 1011 tons of salt in groundwaters of the Murray Basin, south-eastern Australia, are evaluated; these are (a) mixing with original sea water, (b) dissolution of salt deposits, (c) weathering of aquifer minerals and (d) acquisition of solutes via rainfall. The total salinity and chemistry of many groundwater samples are similar to sea-water composition. However, their stable isotopic compositions (δ18O= –6.5 ‰; δ2H = –35) are typical of mean winter rainfall, indicating that all the original sea water has been flushed out of the aquifer. Br/Cl mass ratios are approximately the same as sea water (3.57 x 10-3) indicating that NaCl evaporites (which have Br/Cl<10-4) are not a significant contributor to Cl in the groundwater. Similarly, very low abundances of Cl in aquifer minerals preclude rock weathering as a significant source of Cl. About 1.5 million tons of new salt is deposited in the Murray–Darling Basin each year by rainfall.The groundwater chemistry has evolved by a combination of atmospheric fallout of marine and continentally derived solutes and removal of water by evapo-transpiration over tens of thousands of years of relative aridity. Carbonate dissolution/precipitation, cation exchange and reconstitution of secondary clay minerals in the aquifers results in a groundwater chemistry that retains a ‘sea-water-like’ character.

Drawing on experiences in New South Wales from 1950 to 1980 in modeling and re-use techniques in the development of desalination technology and its application in fresh water production for potable use, the paper describes how Australia realized its responsibilities in developing participative and sustainable approaches to land use and water resources management. An analysis of the lessons from the operation of the Bayswater zero-discharge power station significantly contributed to the debate on sustainable approaches, highlighting that no management policy of a water basin can be implemented without a model based on reliable data from all sectors (including the environment), and no management model can be implemented without the participation of all stakeholders. These ideals were reflected in the conception and establishment of the Murray-Darling Basin Commission. The Commission succeeded in bringing together all major stakeholders in this huge basin, though it took more than 15 years to do so. While widely recognized as one of the most advanced and successful experiences in integrated management of a drainage basin, it has still not achieved the reversal of many unsustainable agricultural practices, giving a clear indication of the difficulties and time required for producing sustainable solutions.

The first empirical application of an established framework for evaluating the adaptive efficiency of policy and project options — the Institutional Cost-Effectiveness Analysis (ICEA) framework — is documented in this paper. The application involves cost-effectiveness comparison of six projects for environmental water recovery in the Murray-Darling Basin, Australia, managed by the New South Wales (NSW) Government under three programs: The Living Murray Initiative; the NSW Wetland Recovery Program; and the NSW Rivers Environmental Restoration Program. Focussing primarily on one of the projects — the Darling Anabranch Pipeline Project (DAPP) — allows an in-depth account to be presented of the ICEA framework’s application. Abatement and transaction costs, and public and private subsets of these costs, were accounted for in the applications. The adaptive efficiency of the DAPP (a “water-saving project”) is found provisionally — i.e., without accounting quantitatively for institutional lock-in costs — to exceed that of the five other environmental water recovery projects (including two “market-purchase projects”) evaluated. This finding is significant given a tendency for economists to presume that environmental water recovery is generally achieved more efficiently through market-purchase projects. With water management, and environmental management more broadly, exposed to increasing uncertainty, adaptive efficiency will grow in importance as a metric for economic evaluation. The application of the ICEA framework documented in this paper can guide researchers in applying this metric to evaluations of projects and policies implemented in, or proposed for, this domain.

Irrigation farmers in the Murray–Darling Basin of Australia are under considerable pressure to reduce the amount of water they use for irrigation, while sustaining production and profitability. Changing from surface to pressurised irrigation systems may provide some or all of these outcomes; however, little is known about the performance of alternative irrigation methods for broadacre annual crops in this region. Therefore, a demonstration site for comparing furrow, subsurface drip and sprinkler irrigation was established on a representative clay soil in the Coleambally Irrigation Area, NSW. The performance of maize (Zea mays L.) under the three irrigation systems was compared during the 2004–05 season. Subsurface drip irrigated maize out-performed sprinkler and furrow irrigated maize in terms of grain yield (drip 11.8 t/ha, sprinkler 10.5 t/ha, furrow 10.1 t/ha at 14% moisture), net irrigation water application (drip 5.1 ML/ha, sprinkler 6.2 ML/ha, furrow 5.3 ML/ha), net irrigation water productivity (drip 2.3 t/ML, sprinkler 1.7 t/ML, furrow 1.9 t/ML) and total water productivity (drip 1.7 t/ML, sprinkler 1.4 t/ML, furrow 1.3 t/ML). Thus, subsurface drip irrigation saved ~30% of the total amount of water (irrigation, rain, soil water) needed to produce the same quantity of grain using furrow irrigation, while sprinkler irrigation saved ~8% of the water used. The higher net irrigation with sprinkler irrigation was largely due to the lower soil water content in the sprinkler block at the time of sowing. An EM31 survey indicated considerable spatial soil variability within each irrigation block, and all irrigation systems had spatially variable water distribution. Yield variability was very high within all irrigation systems, and appeared to be more strongly associated with irrigation variability than soil variability. All irrigation blocks had large patches of early senescence and poor cob fill, which appeared to be due to nitrogen and/or water deficit stress. We expect that crop performance under all irrigation systems can be improved by improving irrigation, soil and N management.

Experiments conducted from November 1996 to June 2002 in adjacent small catchments near Wagga Wagga, New South Wales, compared the productivity and hydrology of a heavily fertilised (about 30 kg phosphorus/ha.year) Phalaris aquatica (phalaris) pasture with that of a lightly fertilised (about 14 kg phosphorus/ha every second year) native grassland that contained a mixture of C3 and C4 perennial grasses, dominantly C4 Bothriochloa macra (redgrass).In summer, the native catchment was dominated by C4 perennial grasses while the phalaris catchment was dominated by annual C4 weedy species. During the cooler months, the phalaris pasture contained higher proportions of Vulpia spp., and other less-desirable annual grasses. Throughout the experiment, the native catchment was dominated by redgrass, whereas in the phalaris catchment the persistence of phalaris declined. Redgrass became prominent on the more arid aspects of the phalaris catchment as the experiment progressed.Pasture production in the phalaris catchment was higher in most seasons than the native catchment, which resulted in an overall stocking rate advantage of about 80%. The productivity gain per unit of P input was 0.4 for the phalaris catchment compared with 1 for the native catchment, implying that phosphorus was applied to the phalaris catchment at an excessive rate.During wet periods the native catchment produced substantially more runoff than the phalaris catchment, while in dry times it developed substantially larger soil water deficits. Runoff from the phalaris catchment was higher in suspended and dissolved nitrogen and phosphorus than for the native catchment. Higher runoff from the native catchment combined with its drier soil profile in summer indicated that its deep drainage potential was less than in the phalaris catchment.

Epizootic haematopoietic necrosis virus (EHNV) was originally detected in Victoria, Australia in 1984. It spread rapidly over two decades with epidemic mortality events in wild redfin perch (Perca fluviatilis) and mild disease in farmed rainbow trout (Oncorhynchus mykiss) being documented across southeastern Australia in New South Wales (NSW), the Australian Capital Territory (ACT), Victoria, and South Australia. We conducted a survey for EHNV between July 2007 and June 2011. The disease occurred in juvenile redfin perch in ACT in December 2008, and in NSW in December 2009 and December 2010. Based on testing 3622 tissue and 492 blood samples collected from fish across southeastern Australia, it was concluded that EHNV was most likely absent from redfin perch outside the endemic area in the upper Murrumbidgee River catchment in the Murray–Darling Basin (MDB), and it was not detected in other fish species. The frequency of outbreaks in redfin perch has diminished over time, and there have been no reports since 2012. As the disease is notifiable and a range of fish species are known to be susceptible to EHNV, existing policies to reduce the likelihood of spreading out of the endemic area are justified.

Groundwater dependent ecosystems (GDEs) require access to groundwater to meet all or some of their water requirements to maintain community structure and function. The increasing demand of surface and groundwater resources has seen the NSW Government put in place management mechanisms to enable the sharing of water between irrigators, the environment, industry, towns and communities via water sharing plans. The groundwater sharing plans aim to provide adaptive management of GDEs by prioritising for protection those that are considered the most ecologically valuable within each plan area. The High Ecological Value Aquatic Ecosystems (HEVAE) framework has already been adopted to prioritise riverine ecosystems for management in surface water sharing plans. Here, we provide a method developed using the HEVAE framework to prioritise vegetation GDEs for management. The GDE HEVAE methods provide a derived ecological value dataset for identified groundwater dependent vegetation that is used to inform the planning and policy decisions in NSW. These decisions are required to manage and mitigate current and future risks caused by groundwater extraction. This is achieved via the identification of ecologically valuable assets to then use as the consequence component in a risk assessment for the groundwater sources, to provide vegetation GDE locations for setback distances for new groundwater production bores, and for the assessment of impacts due to current and potential future groundwater extraction. The GDE HEVAE method uses recorded and predicted spatial data to provide weighted scores for each attribute associated with the four HEVAE criteria (distinctiveness, diversity, vital habitat and naturalness). The combined scores categorise the ecological value of each groundwater dependent vegetation community (depicted as geographic information system (GIS) polygon features) from very high to very low. We apply the GDE HEVAE method to three catchments in order to demonstrate the method’s applicability across the Murray–Darling Basin with varying elevation and climate characteristics. The ecological value outcomes derived from the methods have been used to inform planning and policy decisions by NSW Government processes to allow for protection in not only areas that are currently at risk but to also manage for potential future risks from groundwater extraction.

This research is the extension of a project studying the impact of 19th century severe weather events in Australia and their relation to similar events during the 20th and 21st century. Two floods with the worst known impacts in the Murray–Darling Basin (MDB) are studied. One of these events which occurred during 1956 is relativelywell known and the Bureau of Meteorology archives contain good rainfall data covering the period. Additionally, information on the weather systems causing this rainfall can be obtained. Rainfall, flood and weather system data for this event are presented here and compared with a devastating event during 1870. Although archived Australian rainfall data is negligible during 1870 and there is no record of weather systems affecting Australia during that year, a realistic history of the floods and weather systems in the MDB during 1870 is created. This follows an extensive search through newspaper archives contained in the National Library of Australia’s web site. Examples are presented showing how the meteorological data in 19th century newspapers can be used to create weather charts. Six such events in 1870 are demonstrated and three of these had a phenomenal effect on the Murray–Darling system. The 1870 floods followed drought type conditions and it is remarkable that it was worse in many ways than the 1956 event which followed flood conditions in the MDB during the previous year. The events in 1870 caused much loss of life from drowning in the MDB in particular froman east coast low (ECL) in April 1870 and two Victorian weather systems in September and October 1870. In 1956, there were also record-breaking events especially during March when all-time record monthly rainfall were reported in New South Wales. Overall the greatest impact from flooding across the whole MDB was associated with the 1870 flooding. Analyses of heavy rainfall areas in the MDB showed a linear trend increase from 1900 to 2018. Analysing the same data using an 8-year moving average highlighted three peaks around the five highest annual rainfall years. The largest peak occurred around 1950 and 1956, the second largest around 1973 and 1974 and the third around 2010. Each of these 5 years occurred during negative phases of the Interdecadal Pacific Oscillation (IPO) and positive phases of the Southern Oscillation Index (SOI). Studies have shown that the SOI is a climate driver in the MDB along with a persistent blocking high-pressure systems south of Australia along longitude 140°E with a low to its north. Three major blocking events with record rainfall and flooding in the MDB occurred in 1983, 1984 and 1990. Thiswas during the period 1977–1990 when blocking was conducive to heavy rain in the MDB and was coincidentwith a positive phase of the IPO, thus helping conflictwith the IPO–MDB heavy rainfall relationship. Persistent and unexplained middle level westerly winds kept subtropical Queensland clear of tropical cyclones during the negative phases of the IPO from 1999 to 2009 and during the 1960s, influencing low rainfall in the MDB during those periods.

Abstract. The values and distribution patterns of the strontium (Sr) isotope ratio 87Sr/86Sr in Earth surface materials are of use in the geological, environmental, and social sciences. Ultimately, the 87Sr/86Sr ratios of soils and everything that lives in and on them are inherited from the rocks that are the parent materials of the soil's components. In Australia, there are few large-scale surveys of 87Sr/86Sr available, and here we report on a new, low-density dataset using 112 catchment outlet (floodplain) sediment samples covering 529 000 km2 of inland southeastern Australia (South Australia, New South Wales, Victoria). The coarse (<2 mm) fraction of bottom sediment samples (depth ∼ 0.6–0.8 m) from the National Geochemical Survey of Australia were milled and fully digested before Sr separation by chromatography and 87Sr/86Sr determination by multicollector-inductively coupled plasma mass spectrometry. The results show a wide range of 87Sr/86Sr values from a minimum of 0.7089 to a maximum of 0.7511 (range 0.0422). The median 87Sr/86Sr (± median absolute deviation) is 0.7199 (± 0.0071), and the mean (± standard deviation) is 0.7220 (± 0.0106). The spatial patterns of the Sr isoscape observed are described and attributed to various geological sources and processes. Of note are the elevated (radiogenic) values (≥∼ 0.7270; top quartile) contributed by (1) the Palaeozoic sedimentary country rock and (mostly felsic) igneous intrusions of the Lachlan geological region to the east of the study area; (2) the Palaeoproterozoic metamorphic rocks of the central Broken Hill region; both these sources contribute radiogenic material mainly by fluvial processes; and (3) the Proterozoic to Palaeozoic rocks of the Kanmantoo, Adelaide, Gawler, and Painter geological regions to the west of the area; these sources contribute radiogenic material mainly by aeolian processes. Regions of low 87Sr/86Sr (≤∼ 0.7130; bottom quartile) belong mainly to (1) a few central Murray Basin catchments; (2) some Darling Basin catchments in the northeast; and (3) a few Eromanga geological region-influenced catchments in the northwest of the study area; these sources contribute unradiogenic material mainly by fluvial processes. The new spatial Sr isotope dataset for the DCD (Darling–Curnamona–Delamerian) region is publicly available (de Caritat et al., 2022; https://dx.doi.org/10.26186/146397)​​​​​​​.

AbstractNative and exotic fishes were collected from 29 sites across coastal and inland New South Wales, Queensland and Victoria, using a range of techniques, to infer the distribution of Bothriocephalus acheilognathi (Cestoda: Pseudophyllidea) and the host species in which it occurs. The distribution of B. acheilognathi was determined by that of its principal host, carp, Cyprinuscarpio; it did not occur at sites where carp were not present. The parasite was recorded from all native fish species where the sample size exceeded 30 and which were collected sympatrically with carp: Hypseleotris klunzingeri, Hypseleotris sp. 4, Hypseleotris sp. 5, Phylipnodon grandiceps and Retropinna semoni. Bothriocephalus acheilognathi was also recorded from the exotic fishes Gambusia holbrooki and Carassiusauratus. Hypseleotris sp. 4, Hypseleotris sp. 5, P. grandiceps, R. semoni and C. auratus are new host records. The parasite was not recorded from any sites in coastal drainages. The only carp population examined from a coastal drainage (Albert River, south-east Queensland) was also free of infection; those fish had a parasite fauna distinct from that of carp in inland drainages and may represent a separate introduction event. Bothriocephalus acheilognathi has apparently spread along with its carp hosts and is so far restricted to the Murray-Darling Basin. The low host specificity of this parasite is cause for concern given the threatened or endangered nature of some Australian native freshwater fish species. A revised list of definitive hosts of B. acheilognathiis presented.

The Murray–Darling Basin is a Social-Ecological System (SES) of major importance to Australia and includes extensive wetland areas in the north-western parts of New South Wales. The Gwydir Wetlands and the Macquarie Marshes are the particular focus of this paper. These two wetland SES have undergone five successive adaptive cycles (phases) since they were first visited by Europeans in the early 19th century and the ecological, economic and social drivers initiating each transformation to a new cycle are described and analysed. The arrival of the European settlers with their domestic livestock rapidly displaced the Indigenous SES and the wetlands were extensively grazed; during wet periods the livestock were moved out of the wetlands and moved back in as the water receded. More recent land-use changes resulted from the building of major dams to enable storage of water for use in irrigated agriculture. A consequence of dam construction and water use has been a reduction in the frequency and extent of flooding, which has allowed many parts of the wetlands to be continually grazed. Furthermore, as machinery capable of cultivating the very heavy textured soils became available, dryland cropping became a major enterprise in areas of the floodplain where the likelihood of flooding was reduced. With the reduction in flooding, these wetland sites have been seriously degraded. The final phase has seen the invasion by an exotic weed, lippia [Phyla canescens (Kunth) Greene], which is a perennial that grows mat-like between other species of plants and spreads to produce a virtually mono-specific stand. The domestic livestock carrying capacity of the land becomes more or less zero and the conservation value of the wetlands is also dramatically decreased. Therefore, we suggest that lippia should be classed as an ecosystem engineer that has caused the latest transformation of these wetland SES and suggest research directions to investigate how they can be managed to revert to a state in which lippia is no longer dominant.

Purpose This study aims to explore how health informatics can underpin the successful delivery of recovery-orientated healthcare, in rural and remote regions, to achieve better mental health outcomes. Recovery is an extremely social process that involves being with others and reconnecting with the world. Design/methodology/approach An interpretivist study involving 27 clinicians and 13 clients sought to determine how future expenditure on ehealth could improve mental health treatment and service provision in the western Murray Darling Basin of New South Wales, Australia. Findings Through the use of targeted ehealth strategies, it is possible to increase both the accessibility of information and the quality of service provision. In small communities, the challenges of distance, access to healthcare and the ease of isolating oneself are best overcome through a combination of technology and communal social responsibility. Technology supplements but cannot completely replace face-to-face interaction in the mental health recovery process. Originality/value The recovery model provides a conceptual framework for health informatics in rural and remote regions that is socially responsible. Service providers can affect better recovery for clients through infrastructure that enables timely and responsive remote access whilst driving between appointments. This could include interactive referral services, telehealth access to specialist clinicians, GPS for locating clients in remote areas and mobile coverage for counselling sessions in “real time”. Thus, the technology not only provides better connections but also adds to the responsiveness (and success) of any treatment available.

In south-eastern Australia, the pelodryadid Litoria aurea Group (sensu Tyler & Davies 1978) comprises three species: Litoria aurea (Lesson, 1829), Litoria raniformis (Keferstein, 1867), and Litoria castanea (Steindachner, 1867). All three species have been subject to declines over recent decades and taxonomic uncertainty persists among populations on the tablelands in New South Wales. We address the systematics of the Group by analysing mitochondrial and nuclear DNA sequences to assess divergence in the Litoria raniformis from across its current range in New South Wales (NSW), Victoria, South Australia (SA) and Tasmania. We also included samples of Litoria castanea from a recently rediscovered population in the southern tablelands of NSW. Our phylogenetic and population genetic analyses show that Litoria raniformis comprises northern and southern lineages, showing deep mitochondrial DNA sequence divergence (7% net average sequence divergence) and can be diagnosed by fixed allelic differences at more than 4,000 SNP loci. Samples of the northern lineage were collected from the Murray-Darling Basin while those of the southern lineage were collected from south-eastern South Australia, southern and south-eastern Victoria and Tasmania. Analysis of the morphology and bioacoustics did not unequivocally delineate the two lineages. The presence of a hybrid backcross individual in western Victoria at the northern margin of the southern lineage, leads us to assign sub-species status to the two lineages, L. r. raniformis for the northern lineage and L. r. major for the southern lineage. Our data do not unequivocally resolve the taxonomic status of L. castanea which will require molecular genetic analyses of museum vouchers from those parts of the range where L. castanea and L. raniformis are no longer extant. Our data also suggest that human mediated movement of frogs may have occurred over the past 50 years. Our genotyping of vouchers collected in the 1970s from the Mount Lofty Ranges in South Australia detected mitochondrial haplotypes of both sub-species and SNP analysis showed that a single Tasmanian specimen was a backcross with L. r. raniformis ancestry. Movement of L. r. raniformis into Tasmania and both sub-species into the Mount Lofty Ranges are not likely due to passive movements of animals through agricultural commerce, but due to the attractiveness of the species as pets and subsequent escapes or releases, potentially of the larval life stage.

Abstract. Streamflow variability and trends in Australia were investigated for 222 high-quality stream gauging stations having 30 years or more continuous unregulated streamflow records. Trend analysis identified seasonal, inter-annual and decadal variability, long-term monotonic trends and step changes in streamflow. Trends were determined for annual total flow, baseflow, seasonal flows, daily maximum flow and three quantiles of daily flow. A distinct pattern of spatial and temporal variation in streamflow was evident across different hydroclimatic regions in Australia. Most of the stations in southeastern Australia spread across New South Wales and Victoria showed a significant decreasing trend in annual streamflow, while increasing trends were retained within the northern part of the continent. No strong evidence of significant trend was observed for stations in the central region of Australia and northern Queensland. The findings from step change analysis demonstrated evidence of changes in hydrologic responses consistent with observed changes in climate over the past decades. For example, in the Murray–Darling Basin, 51 out of 75 stations were identified with step changes of significant reduction in annual streamflow during the middle to late 1990s, when relatively dry years were recorded across the area. Overall, the hydrologic reference stations (HRSs) serve as critically important gauges for streamflow monitoring and changes in long-term water availability inferred from observed datasets. A wealth of freely downloadable hydrologic data is provided at the HRS web portal including annual, seasonal, monthly and daily streamflow data, as well as trend analysis products and relevant site information.

Irrigation proposals to divert water from the Paroo and Warrego Rivers in arid Australia will affect their aquatic ecosystems. These two are the last of 26 major rivers in the Murray-Darling Basin without large dams and diversions. Knowledge of the extent of their biodiversity value is critical to assessing likely impacts. During the 1990 flood, 1.73 million ha of wetlands, or 12.5% of the land surface of the Paroo and Warrego River catchments, were flooded. Flooded wetland area in the respective catchments was 781 330 ha and 890 534 ha. Most of the wetland area (97%) was floodplain, with 37 freshwater lakes (>50 ha) occupying 2.5% of the wetland area and 177 salt lakes covering 0.8%. A high diversity and abundance of biota depend on these wetlands. Only 7% of the wetland area, all in the Paroo catchment, is in conservation reserves. New South Wales has a high proportion of the wetland area on the Paroo (60%) and a substantial proportion of the wetland area on the Warrego River (23%). Queensland, the upstream state, will influence the ecology of the entire catchment areas of both river systems through its proposed water management plan. Any resulting extraction practices will have detrimental ecological consequences within a decade. Conservation of wetlands is usually site-focused and reflects a paradigm of conservation based on reservation of parcels of land. However, wetlands are dependent on water that is seldom adequately protected. Intergovernment co-operation should protect the entire catchment of the Paroo River from major diversions and stop further development on the Warrego River. This would do more for the conservation of wetlands than the formal reservation of small parts of their catchments.

Abstract. The Hydrologic Reference Stations is a network of 467 high-quality streamflow gauging stations across Australia that is developed and maintained by the Bureau of Meteorology as part of an ongoing responsibility under the Water Act 2007. The main objectives of the service are to observe and detect climate-driven changes in observed streamflow and to provide a quality-controlled dataset for research. We investigate trends and step changes in streamflow across Australia in data from all 467 streamflow gauging stations. Data from 30 to 69 years in duration ending in February 2019 were examined. We analysed data in terms of water-year totals and for the four seasons. The commencement of the water year varies across the country – mainly from February–March in the south to September–October in the north. We summarized our findings for each of the 12 drainage divisions defined by Australian Hydrological Geospatial Fabric (Geofabric) and for continental Australia as a whole. We used statistical tests to detect and analyse linear and step changes in seasonal and annual streamflow. Monotonic trends were detected using modified Mann–Kendall (MK) tests, including a variance correction approach (MK3), a block bootstrap approach (MK3bs) and a long-term persistence approach (MK4). A nonparametric Pettitt test was used for step-change detection and identification. The regional significance of these changes at the drainage division scale was analysed and synthesized using a Walker test. The Murray–Darling Basin, home to Australia's largest river system, showed statistically significant decreasing trends for the region with respect to the annual total and all four seasons. Drainage divisions in New South Wales, Victoria and Tasmania showed significant annual and seasonal decreasing trends. Similar results were found in south-western Western Australia, South Australia and north-eastern Queensland. There was no significant spatial pattern observed in central nor mid-west Western Australia, with one possible explanation for this being the sparse density of streamflow stations and/or the length of the datasets available. Only the Tanami–Timor Sea Coast drainage division in northern Australia showed increasing trends and step changes in annual and seasonal streamflow that were regionally significant. Most of the step changes occurred during 1970–1999. In the south-eastern part of Australia, the majority of the step changes occurred in the 1990s, before the onset of the “Millennium Drought”. Long-term monotonic trends in observed streamflow and its regional significance are consistent with observed changes in climate experienced across Australia. The findings of this study will assist water managers with long-term infrastructure planning and management of water resources under climate variability and change across Australia.

In the Murray–Darling Basin, irrigated agriculture, which produces rice, dairy, cotton and citrus, is a large consumer of water resources. Effective management of the water resource is therefore important to ensure sustainability of irrigated agriculture. In the lower Gwydir and Macquarie valleys, respectively located in northern and central New South Wales of Australia, extensive irrigated-cotton production is an important contributor to the nation’s export earnings. However, there are problems of excessive deep drainage (DD) in these regions. To address them requires soil and water quality information, but there is little quantitative information to plan for and implement improved water use efficiency. In this paper, we explore methods that could efficiently generate data on natural resources. First, we carried out an electromagnetic induction (EM38) survey to characterise broad soil profile types in the Ashley (lower Gwydir valley) and Trangie (lower Macquarie valley) districts. From the resulting apparent electrical conductivity (ECa, mS/m) data collected using an EM 38 (vertical mode of operation), soil profile sites were selected and sampled, followed by laboratory analysis carried to determine exchangeable cations and clay content. The soil data collected were analysed with a salt and leaching fraction (SaLF) model, based on specific water quality and quantity parameters, such as electrical conductivity of irrigation water (ECiw, dS/m) and rainfall (R, mm/year). Various water application rates (I) were also considered, to simulate irrigated cotton (I = 600 mm/year) and rice production (I = 1200 mm/year) as well as shallow water reservoirs (I = 1800 mm/year). For each irrigation scenario, DD values (mm/year) were estimated. An exponential function was used to describe the relationships between ECa values obtained with the EM38 and estimated DD. These relationships were then used to estimate DD at each of the EM38 survey sites, whereupon cut-off (zc) values were used for indicator transforms of the data. Using indicator kriging (IK) and various irrigation scenarios, we demonstrate the usefulness of this approach in identifying areas of high risk of DD exceeding various cut-off values (zc = 50, 75, 100 and 200 mm/year). Thus, we show where improvements in water-use efficiency could be achieved in the irrigated cotton growing districts of Ashley and Trangie.

The Murray Darling Basin contains 40% of Australia’s farms and is subject to multi-year droughts that put severe pressure on southeast Australia’s freshwater resources. Yet the long-term frequency, timing and potential severity of these droughts is unknown, as there are few high-resolution paleoclimate records from the basin that extend past the instrumental era. In this study, we investigate the potential of stalagmites from Careys Cave, Wee Jasper, in the Murray-Darling Basin to record past droughts. We use a multiproxy approach of stalagmite stable isotopes, trace element data, and climate reanalysis. We show that (a) stalagmite δ18O at this site likely records either local or regional precipitation amount and (b) stalagmite δ18O shows reasonable coherence with decadal-scale wet and dry changes in regional rainfall over the last 150 years, including the Federation Drought (1895–1902). Therefore, stalagmites from Wee Jasper can be used to draw regional inferences about past rainfall and have potential to extend the record of past droughts in the Murray Darling Basin beyond the limits of historical data. Extracting such a record will enable a better understanding of the causes of multi-year droughts in the region and consequently better planning, mitigation, and resilience in the basin.

Scholarship on the hydrosocial cycle has tended to overlook the atmospheric phase of the cycle. This paper identifies and conceptualises a politics of evaporation in Australia’s Murray-Darling Basin. Evaporation is not a neutral hydrological concept to be understood, measured or acted on without an appreciation of the networks in which it originates, the geo-political circumstances that continue to shape its circulation, and its socio-spatial effects. The politics of evaporation is conceptualised here as a process of hydrosocial territorialisation in which atmospheric water came to be known as a force acting within a balanced hydrologic cycle, and ‘atmospheric territory’ was created. The scientific origins of evaporation show (i) how modernist hydrologic technologies and conventions that relied on containment and territorialisation to account for and control water led to the negative depiction of evaporation as a loss, and (ii) the historical depth of processes of abstraction and commensuration that are so influential in today’s regimes of water accounting and marketisation. The politics of evaporation is identified empirically in the controversy surrounding the management of the Menindee Lakes and the lower Darling River in New South Wales, where efforts to ‘save’ water according to the logic of efficiency have enrolled atmospheric water into a Basin-wide program to redistribute surface water. The lens of evaporation theorises a neglected aspect of the materiality of water that is particularly important to the dry, hot parts of the world. It challenges us to rethink the ‘cycle’ as well as the ‘hydro’, while providing further evidence of the value of thinking about territory in a material register as volumetric and not areal.

Conventional agriculture currently relies on the intensive and expansive growth of a small number of monocultures, this is both risky for food security and is causing substantial environmental degradation. Crops are typically grown far from their native origins, enduring climates, pests, and diseases that they have little evolutionary adaptation to. As a result, farming practices involve modifying the environment to suit the crop, often via practices including vegetation clearing, drainage, irrigation, tilling, and the application of fertilizers, pesticides, and herbicides. One avenue for improvement, however, is the diversification of monoculture agricultural systems with traditional foods native to the area. Native foods benefit from evolutionary history, enabling adaptation to local environmental conditions, reducing the need for environmental modifications and external inputs. Traditional use of native foods in Australia has a rich history, yet the commercial production of native foods remains small compared with conventional crops, such as wheat, barley and sugarcane. Identifying what native crops can grow where would be a first step in scoping potential native food industries and supporting farmers seeking to diversify their cropping. In this study, I modeled the potentially suitable distributions of 177 native food and forage species across Australia, given their climate and soil preferences. The coastal areas of Queensland's wet tropics, south-east Queensland, New South Wales, and Victoria were predicted to support the greatest diversity of native food and forage species (as high 80–120 species). These areas also correspond to the nation's most agriculturally intensive areas, including much of the Murray-Darling Basin, suggesting high potential for the diversification of existing intensive monocultures. Native crops with the most expansive potential distribution include Acacia trees, Maloga bean, bush plum, Emu apple, native millet, and bush tomatoes, with these crops largely being tolerant of vast areas of semi-arid conditions. In addition to greater food security, if diverse native cropping results in greater ecosystem service provisioning, through carbon storage, reduced water usage, reduced nutrient runoff, or greater habitat provision, then payment for ecosystem service schemes could also provide supplemental farm income.

Unconventional energy sources have become increasingly important to the global energy mix. These include coal seam gas, shale gas and shale oil. The unconventional gas industry was pioneered in the United States and embraced following the first oil shock in 1973 (Rogers). As has been the case with many global resources (Hiscock), many of the same companies that worked in the USA carried their experience in this industry to early Australian explorations. Recently the USA has secured significant energy security with the development of unconventional energy deposits such as the Marcellus shale gas and the Bakken shale oil (Dobb; McGraw). But this has not come without environmental impact, including contamination to underground water supply (Osborn, Vengosh, Warner, Jackson) and potential greenhouse gas contributions (Howarth, Santoro, Ingraffea; McKenna). The environmental impact of unconventional gas extraction has raised serious public concern about the introduction and growth of the industry in Australia. In coal rich Australia coal seam gas is currently the major source of unconventional gas. Large gas deposits have been found in prime agricultural land along eastern Australia, such as the Liverpool Plains in New South Wales and the Darling Downs in Queensland. Competing land-uses and a series of environmental incidents from the coal seam gas industry have warranted major protest from a coalition of environmentalists and farmers (Berry; McLeish). Conflict between energy companies wanting development and environmentalists warning precaution is an easy script to cast for frontline media coverage. But historical perspectives are often missing in these contemporary debates. While coal mining and natural gas have often received “boosting” historical coverage (Diamond; Wilkinson), and although historical themes of “development” and “rushes” remain predominant when observing the span of the industry (AGA; Blainey), the history of unconventional gas, particularly the history of its environmental impact, has been little studied. Few people are aware, for example, that the first shale gas exploratory well was completed in late 2010 in the Cooper Basin in Central Australia (Molan) and is considered as a “new” frontier in Australian unconventional gas. Moreover many people are unaware that the first coal seam gas wells were completed in 1976 in Queensland. The first four wells offer an important moment for reflection in light of the industry’s recent move into Central Australia. By locating and analysing the first four coal seam gas wells, this essay identifies the roots of the unconventional gas industry in Australia and explores the early environmental impact of these wells. By analysing exploration reports that have been placed online by the Queensland Department of Natural Resources and Mines through the lens of environmental history, the dominant developmental narrative of this industry can also be scrutinised. These narratives often place more significance on economic and national benefits while displacing the environmental and social impacts of the industry (Connor, Higginbotham, Freeman, Albrecht; Duus; McEachern; Trigger). This essay therefore seeks to bring an environmental insight into early unconventional gas mining in Australia. As the author, I am concerned that nearly four decades on and it seems that no one has heeded the warning gleaned from these early wells and early exploration reports, as gas exploration in Australia continues under little scrutiny. Arrival The first four unconventional gas wells in Australia appear at the beginning of the industry world-wide (Schraufnagel, McBane, and Kuuskraa; McClanahan). The wells were explored by Houston Oils and Minerals—a company that entered the Australian mining scene by sharing a mining prospect with International Australian Energy Company (Wiltshire). The International Australian Energy Company was owned by Black Giant Oil Company in the US, which in turn was owned by International Royalty and Oil Company also based in the US. The Texan oilman Robert Kanton held a sixteen percent share in the latter. Kanton had an idea that the Mimosa Syncline in the south-eastern Bowen Basin was a gas trap waiting to be exploited. To test the theory he needed capital. Kanton presented the idea to Houston Oil and Minerals which had the financial backing to take the risk. Shotover No. 1 was drilled by Houston Oil and Minerals thirty miles south-east of the coal mining town of Blackwater. By late August 1975 it was drilled to 2,717 metres, discovered to have little gas, spudded, and, after a spend of $610,000, abandoned. The data from the Shotover well showed that the porosity of the rocks in the area was not a trap, and the Mimosa Syncline was therefore downgraded as a possible hydrocarbon location. There was, however, a small amount of gas found in the coal seams (Benbow 16). The well had passed through the huge coal seams of both the Bowen and Surat basins—important basins for the future of both the coal and gas industries. Mining Concepts In 1975, while Houston Oil and Minerals was drilling the Shotover well, US Steel and the US Bureau of Mines used hydraulic fracture, a technique already used in the petroleum industry, to drill vertical surface wells to drain gas from a coal seam (Methane Drainage Taskforce 102). They were able to remove gas from the coal seam before it was mined and sold enough to make a profit. With the well data from the Shotover well in Australia compiled, Houston returned to the US to research the possibility of harvesting methane in Australia. As the company saw it, methane drainage was “a novel exploitation concept” and the methane in the Bowen Basin was an “enormous hydrocarbon resource” (Wiltshire 7). The Shotover well passed through a section of the German Creek Coal measures and this became their next target. In September 1976 the Shotover well was re-opened and plugged at 1499 meters to become Australia’s first exploratory unconventional gas well. By the end of the month the rig was released and gas production tested. At one point an employee on the drilling operation observed a gas flame “the size of a 44 gal drum” (HOMA, “Shotover # 1” 9). But apart from the brief show, no gas flowed. And yet, Houston Oil and Minerals was not deterred, as they had already taken out other leases for further prospecting (Wiltshire 4). Only a week after the Shotover well had failed, Houston moved the methane search south-east to an area five miles north of the Moura township. Houston Oil and Minerals had researched the coal exploration seismic surveys of the area that were conducted in 1969, 1972, and 1973 to choose the location. Over the next two months in late 1976, two new wells—Kinma No.1 and Carra No.1—were drilled within a mile from each other and completed as gas wells. Houston Oil and Minerals also purchased the old oil exploration well Moura No. 1 from the Queensland Government and completed it as a suspended gas well. The company must have mined the Department of Mines archive to find Moura No.1, as the previous exploration report from 1969 noted methane given off from the coal seams (Sell). By December 1976 Houston Oil and Minerals had three gas wells in the vicinity of each other and by early 1977 testing had occurred. The results were disappointing with minimal gas flow at Kinma and Carra, but Moura showed a little more promise. Here, the drillers were able to convert their Fairbanks-Morse engine driving the pump from an engine run on LPG to one run on methane produced from the well (Porter, “Moura # 1”). Drink This? Although there was not much gas to find in the test production phase, there was a lot of water. The exploration reports produced by the company are incomplete (indeed no report was available for the Shotover well), but the information available shows that a large amount of water was extracted before gas started to flow (Porter, “Carra # 1”; Porter, “Moura # 1”; Porter, “Kinma # 1”). As Porter’s reports outline, prior to gas flowing, the water produced at Carra, Kinma and Moura totalled 37,600 litres, 11,900 and 2,900 respectively. It should be noted that the method used to test the amount of water was not continuous and these amounts were not the full amount of water produced; also, upon gas coming to the surface some of the wells continued to produce water. In short, before any gas flowed at the first unconventional gas wells in Australia at least 50,000 litres of water were taken from underground. Results show that the water was not ready to drink (Mathers, “Moura # 1”; Mathers, “Appendix 1”; HOMA, “Miscellaneous Pages” 21-24). The water had total dissolved solids (minerals) well over the average set by the authorities (WHO; Apps Laboratories; NHMRC; QDAFF). The well at Kinma recorded the highest levels, almost two and a half times the unacceptable standard. On average the water from the Moura well was of reasonable standard, possibly because some water was extracted from the well when it was originally sunk in 1969; but the water from Kinma and Carra was very poor quality, not good enough for crops, stock or to be let run into creeks. The biggest issue was the sodium concentration; all wells had very high salt levels. Kinma and Carra were four and two times the maximum standard respectively. In short, there was a substantial amount of poor quality water produced from drilling and testing the three wells. Fracking Australia Hydraulic fracturing is an artificial process that can encourage more gas to flow to the surface (McGraw; Fischetti; Senate). Prior to the testing phase at the Moura field, well data was sent to the Chemical Research and Development Department at Halliburton in Oklahoma, to examine the ability to fracture the coal and shale in the Australian wells. Halliburton was the founding father of hydraulic fracture. In Oklahoma on 17 March 1949, operating under an exclusive license from Standard Oil, this company conducted the first ever hydraulic fracture of an oil well (Montgomery and Smith). To come up with a program of hydraulic fracturing for the Australian field, Halliburton went back to the laboratory. They bonded together small slabs of coal and shale similar to Australian samples, drilled one-inch holes into the sample, then pressurised the holes and completed a “hydro-frac” in miniature. “These samples were difficult to prepare,” they wrote in their report to Houston Oil and Minerals (HOMA, “Miscellaneous Pages” 10). Their program for fracturing was informed by a field of science that had been evolving since the first hydraulic fracture but had rapidly progressed since the first oil shock. Halliburton’s laboratory test had confirmed that the model of Perkins and Kern developed for widths of hydraulic fracture—in an article that defined the field—should also apply to Australian coals (Perkins and Kern). By late January 1977 Halliburton had issued Houston Oil and Minerals with a program of hydraulic fracture to use on the central Queensland wells. On the final page of their report they warned: “There are many unknowns in a vertical fracture design procedure” (HOMA, “Miscellaneous Pages” 17). In July 1977, Moura No. 1 became the first coal seam gas well hydraulically fractured in Australia. The exploration report states: “During July 1977 the well was killed with 1% KCL solution and the tubing and packer were pulled from the well … and pumping commenced” (Porter 2-3). The use of the word “kill” is interesting—potassium chloride (KCl) is the third and final drug administered in the lethal injection of humans on death row in the USA. Potassium chloride was used to minimise the effect on parts of the coal seam that were water-sensitive and was the recommended solution prior to adding other chemicals (Montgomery and Smith 28); but a word such as “kill” also implies that the well and the larger environment were alive before fracking commenced (Giblett; Trigger). Pumping recommenced after the fracturing fluid was unloaded. Initially gas supply was very good. It increased from an average estimate of 7,000 cubic feet per day to 30,000, but this only lasted two days before coal and sand started flowing back up to the surface. In effect, the cleats were propped open but the coal did not close and hold onto them which meant coal particles and sand flowed back up the pipe with diminishing amounts of gas (Walters 12). Although there were some interesting results, the program was considered a failure. In April 1978, Houston Oil and Minerals finally abandoned the methane concept. Following the failure, they reflected on the possibilities for a coal seam gas industry given the gas prices in Queensland: “Methane drainage wells appear to offer no economic potential” (Wooldridge 2). At the wells they let the tubing drop into the hole, put a fifteen foot cement plug at the top of the hole, covered it with a steel plate and by their own description restored the area to its “original state” (Wiltshire 8). Houston Oil and Minerals now turned to “conventional targets” which included coal exploration (Wiltshire 7). A Thousand Memories The first four wells show some of the critical environmental issues that were present from the outset of the industry in Australia. The process of hydraulic fracture was not just a failure, but conducted on a science that had never been tested in Australia, was ponderous at best, and by Halliburton’s own admission had “many unknowns”. There was also the role of large multinationals providing “experience” (Briody; Hiscock) and conducting these tests while having limited knowledge of the Australian landscape. Before any gas came to the surface, a large amount of water was produced that was loaded with a mixture of salt and other heavy minerals. The source of water for both the mud drilling of Carra and Kinma, as well as the hydraulic fracture job on Moura, was extracted from Kianga Creek three miles from the site (HOMA, “Carra # 1” 5; HOMA, “Kinma # 1” 5; Porter, “Moura # 1”). No location was listed for the disposal of the water from the wells, including the hydraulic fracture liquid. Considering the poor quality of water, if the water was disposed on site or let drain into a creek, this would have had significant environmental impact. Nobody has yet answered the question of where all this water went. The environmental issues of water extraction, saline water and hydraulic fracture were present at the first four wells. At the first four wells environmental concern was not a priority. The complexity of inter-company relations, as witnessed at the Shotover well, shows there was little time. The re-use of old wells, such as the Moura well, also shows that economic priorities were more important. Even if environmental information was considered important at the time, no one would have had access to it because, as handwritten notes on some of the reports show, many of the reports were “confidential” (Sell). Even though coal mines commenced filing Environmental Impact Statements in the early 1970s, there is no such documentation for gas exploration conducted by Houston Oil and Minerals. A lack of broader awareness for the surrounding environment, from floral and faunal health to the impact on habitat quality, can be gleaned when reading across all the exploration reports. Nearly four decades on and we now have thousands of wells throughout the world. Yet, the challenges of unconventional gas still persist. The implications of the environmental history of the first four wells in Australia for contemporary unconventional gas exploration and development in this country and beyond are significant. Many environmental issues were present from the beginning of the coal seam gas industry in Australia. Owning up to this history would place policy makers and regulators in a position to strengthen current regulation. The industry continues to face the same challenges today as it did at the start of development—including water extraction, hydraulic fracturing and problems associated with drilling through underground aquifers. Looking more broadly at the unconventional gas industry, shale gas has appeared as the next target for energy resources in Australia. Reflecting on the first exploratory shale gas wells drilled in Central Australia, the chief executive of the company responsible for the shale gas wells noted their deliberate decision to locate their activities in semi-desert country away from “an area of prime agricultural land” and conflict with environmentalists (quoted in Molan). Moreover, the journalist Paul Cleary recently complained about the coal seam gas industry polluting Australia’s food-bowl but concluded that the “next frontier” should be in “remote” Central Australia with shale gas (Cleary 195). It appears that preference is to move the industry to the arid centre of Australia, to the ecologically and culturally unique Lake Eyre Basin region (Robin and Smith). Claims to move the industry away from areas that might have close public scrutiny disregard many groups in the Lake Eyre Basin, such as Aboriginal rights to land, and appear similar to other industrial projects that disregard local inhabitants, such as mega-dams and nuclear testing (Nixon). References AGA (Australian Gas Association). “Coal Seam Methane in Australia: An Overview.” AGA Research Paper 2 (1996). Apps Laboratories. “What Do Your Water Test Results Mean?” Apps Laboratories 7 Sept. 2012. 1 May 2013 ‹http://appslabs.com.au/downloads.htm›. Benbow, Dennis B. “Shotover No. 1: Lithology Report for Houston Oil and Minerals Corporation.” November 1975. Queensland Digital Exploration Reports. Company Report 5457_2. Brisbane: Queensland Department of Resources and Mines 4 June 2012. 1 May 2013 ‹https://qdexguest.deedi.qld.gov.au/portal/site/qdex/search?REPORT_ID=5457&COLLECTION_ID=999›. Berry, Petrina. “Qld Minister Refuses to Drink CSG Water.” news.com.au, 22 Apr. 2013. 1 May 2013 ‹http://www.news.com.au/breaking-news/national/qld-minister-refuses-to-drink-csg-water/story-e6frfku9-1226626115742›. Blainey, Geofrey. The Rush That Never Ended: A History of Australian Mining. Carlton: Melbourne University Publishing, 2003. Briody, Dan. The Halliburton Agenda: The Politics of Oil and Money. Singapore: Wiley, 2004. Cleary, Paul. Mine-Field: The Dark Side of Australia’s Resource Rush. Collingwood: Black Inc., 2012. Connor, Linda, Nick Higginbotham, Sonia Freeman, and Glenn Albrecht. “Watercourses and Discourses: Coalmining in the Upper Hunter Valley, New South Wales.” Oceania 78.1 (2008): 76-90. Diamond, Marion. “Coal in Australian History.” Coal and the Commonwealth: The Greatness of an Australian Resource. Eds. Peter Knights and Michael Hood. St Lucia: University of Queensland, 2009. 23-45. 20 Apr. 2013 ‹http://www.peabodyenergy.com/mm/files/News/Publications/Special%20Reports/coal_and_commonwealth%5B1%5D.pdf›. Dobb, Edwin. “The New Oil Landscape.” National Geographic (Mar. 2013): 29-59. Duus, Sonia. “Coal Contestations: Learning from a Long, Broad View.” Rural Society Journal 22.2 (2013): 96-110. Fischetti, Mark. “The Drillers Are Coming.” Scientific American (July 2010): 82-85. Giblett, Rod. “Terrifying Prospects and Resources of Hope: Minescapes, Timescapes and the Aesthetics of the Future.” Continuum: Journal of Media and Cultural Studies 23.6 (2009): 781-789. Hiscock, Geoff. Earth Wars: The Battle for Global Resources. Singapore: Wiley, 2012. HOMA (Houston Oil and Minerals of Australia). “Carra # 1: Well Completion Report.” July 1977. Queensland Digital Exploration Reports. Company Report 6054_1. Brisbane: Queensland Department of Resources and Mines. 21 Feb. 2012 ‹https://qdexguest.deedi.qld.gov.au/portal/site/qdex/search?REPORT_ID=6054&COLLECTION_ID=999›. ———. “Kinma # 1: Well Completion Report.” August 1977. Queensland Digital Exploration Reports. Company Report 6190_2. Brisbane: Queensland Department of Resources and Mines. 21 Feb. 2012 ‹https://qdexguest.deedi.qld.gov.au/portal/site/qdex/search?REPORT_ID=6190&COLLECTION_ID=999›. ———. “Miscellaneous Pages. Including Hydro-Frac Report.” August 1977. Queensland Digital Exploration Reports. Company Report 6190_17. Brisbane: Queensland Department of Resources and Mines. 31 May 2012 ‹https://qdexguest.deedi.qld.gov.au/portal/site/qdex/search?REPORT_ID=6190&COLLECTION_ID=999›. ———. “Shotover # 1: Well Completion Report.” March 1977. Queensland Digital Exploration Reports. Company Report 5457_1. Brisbane: Queensland Department of Resources and Mines. 22 Feb. 2012 ‹https://qdexguest.deedi.qld.gov.au/portal/site/qdex/search?REPORT_ID=5457&COLLECTION_ID=999›. Howarth, Robert W., Renee Santoro, and Anthony Ingraffea. “Methane and the Greenhouse-Gas Footprint of Natural Gas from Shale Formations: A Letter.” Climatic Change 106.4 (2011): 679-690. Mathers, D. “Appendix 1: Water Analysis.” 1-2 August 1977. Brisbane: Government Chemical Laboratory. Queensland Digital Exploration Reports. Company Report 6054_4. Brisbane: Queensland Department of Resources and Mines. 21 Feb. 2012 ‹https://qdexguest.deedi.qld.gov.au/portal/site/qdex/search?REPORT_ID=6054&COLLECTION_ID=999›. ———. “Moura # 1: Testing Report Appendix D Fluid Analyses.” 2 Aug. 1977. Brisbane: Government Chemical Laboratory. Queensland Digital Exploration Reports. Company Report 5991_5. Brisbane: Queensland Department of Resources and Mines. 22 Feb. 2012 ‹https://qdexguest.deedi.qld.gov.au/portal/site/qdex/search?REPORT_ID=5991&COLLECTION_ID=999›. McClanahan, Elizabeth A. “Coalbed Methane: Myths, Facts, and Legends of Its History and the Legislative and Regulatory Climate into the 21st Century.” Oklahoma Law Review 48.3 (1995): 471-562. McEachern, Doug. “Mining Meaning from the Rhetoric of Nature—Australian Mining Companies and Their Attitudes to the Environment at Home and Abroad.” Policy Organisation and Society (1995): 48-69. McGraw, Seamus. The End of Country. New York: Random House, 2011. McKenna, Phil. “Uprising.” Matter 21 Feb. 2013. 1 Mar. 2013 ‹https://www.readmatter.com/a/uprising/›.McLeish, Kathy. “Farmers to March against Coal Seam Gas.” ABC News 27 Apr. 2012. 22 Apr. 2013 ‹http://www.abc.net.au/news/2012-04-27/farmers-to-march-against-coal-seam-gas/3977394›. Methane Drainage Taskforce. Coal Seam Methane. Sydney: N.S.W. Department of Mineral Resources and Office of Energy, 1992. Molan, Lauren. “A New Shift in the Global Energy Scene: Australian Shale.” Gas Today Online. 4 Nov. 2011. 3 May 2012 ‹http://gastoday.com.au/news/a_new_shift_in_the_global_energy_scene_australian_shale/064568/›. Montgomery, Carl T., and Michael B. Smith. “Hydraulic Fracturing: History of an Enduring Technology.” Journal of Petroleum Technology (2010): 26-32. 30 May 2012 ‹http://www.spe.org/jpt/print/archives/2010/12/10Hydraulic.pdf›. NHMRC (National Health and Medical Research Council). National Water Quality Management Strategy: Australian Drinking Water Guidelines 6. Canberra: Australian Government, 2004. 7 Sept. 2012 ‹http://www.nhmrc.gov.au/guidelines/publications/eh52›. Nixon, Rob. “Unimagined Communities: Developmental Refugees, Megadams and Monumental Modernity.” New Formations 69 (2010): 62-80. Osborn, Stephen G., Avner Vengosh, Nathaniel R. Warner, and Robert B. Jackson. “Methane Contamination of Drinking Water Accompanying Gas-Well Drilling and Hydraulic Fracturing.” Proceedings of the National Academy of Sciences 108.20 (2011): 8172-8176. Perkins, T.K., and L.R. Kern. “Widths of Hydraulic Fractures.” Journal of Petroleum Technology 13.9 (1961): 937-949. Porter, Seton M. “Carra # 1:Testing Report, Methane Drainage of the Baralaba Coal Measures, A.T.P. 226P, Central Queensland, Australia.” Oct. 1977. Queensland Digital Exploration Reports. Company Report 6054_7. Brisbane: Queensland Department of Resources and Mines. 21 Feb. 2012 ‹https://qdexguest.deedi.qld.gov.au/portal/site/qdex/search?REPORT_ID=6054&COLLECTION_ID=999›. ———. “Kinma # 1: Testing Report, Methane Drainage of the Baralaba Coal Measures, A.T.P. 226P, Central Queensland, Australia.” Oct. 1977. Queensland Digital Exploration Reports. Company Report 6190_16. Brisbane: Queensland Department of Resources and Mines. 21 Feb. 2012 ‹https://qdexguest.deedi.qld.gov.au/portal/site/qdex/search?REPORT_ID=6190&COLLECTION_ID=999›. ———. “Moura # 1: Testing Report: Methane Drainage of the Baralaba Coal Measures: A.T.P. 226P, Central Queensland, Australia.” Oct. 1977. Queensland Digital Exploration Reports. Company Report 6190_15. Brisbane: Queensland Department of Resources and Mines. 21 Feb. 2012 ‹https://qdexguest.deedi.qld.gov.au/portal/site/qdex/search?REPORT_ID=6190&COLLECTION_ID=999›. QDAFF (Queensland Department of Agriculture, Fisheries and Forestry). “Interpreting Water Analysis for Crop and Pasture.” 1 Aug. 2012. 1 May 2013 ‹http://www.daff.qld.gov.au/ 26_4347.htm›. Robin, Libby, and Mike Smith. “Prologue.” Desert Channels: The Impulse To Conserve. Eds. Libby Robin, Chris Dickman and Mandy Martin. Collingwood: CSIRO Publishing, 2010. XIII-XVII. Rogers, Rudy E. Coalbed Methane: Principles and Practice. Englewood Cliffs: Prentice Hill, 1994. Sell, B.H. “T.E.P.L. Moura No.1 Well Completion Report.” October 1969. Queensland Digital Exploration Reports. Company Report 2899_1. Brisbane: Queensland Department of Resources and Mines. 26 Feb. 2013 ‹https://qdexguest.deedi.qld.gov.au/portal/site/qdex/search?REPORT_ID=2899&COLLECTION_ID=999›. Senate. Management of the Murray Darling Basin: Interim Report: The Impact of Coal Seam Gas on the Management of the Murray Darling Basin. Canberra: Rural Affairs and Transport References Committee, 2011. Schraufnagel, Richard, Richard McBane, and Vello Kuuskraa. “Coalbed Methane Development Faces Technology Gaps.” Oil & Gas Journal 88.6 (1990): 48-54. Trigger, David. “Mining, Landscape and the Culture of Development Ideology in Australia.” Ecumene 4 (1997): 161-180. Walters, Ronald L. Letter to Dennis Benbow. 29 August 1977. In Seton M. Porter, “Moura # 1: Testing Report: Methane Drainage of the Baralaba Coal Measures: A.T.P. 226P, Central Queensland, Australia.” October 1977, 11-14. Queensland Digital Exploration Reports. Company Report 6190_15. Brisbane: Queensland Department of Resources and Mines. 21 Feb. 2012 ‹https://qdexguest.deedi.qld.gov.au/portal/site/qdex/search?REPORT_ID=6190&COLLECTION_ID=999›. WHO (World Health Organization). International Standards for Drinking-Water. 3rd Ed. Geneva, 1971. Wilkinson, Rick. A Thirst for Burning: The Story of Australia's Oil Industry. Sydney: David Ell Press, 1983. Wiltshire, M.J. “A Review to ATP 233P, 231P (210P) – Bowen/Surat Basins, Queensland for Houston Oil Minerals Australia, Inc.” 19 Jan. 1979. Queensland Digital Exploration Reports Database. Company Report 6816. Brisbane: Queensland Department of Resources and Mines. 21 Feb. 2012 ‹https://qdexguest.deedi.qld.gov.au/portal/site/qdex/search?REPORT_ID=6816&COLLECTION_ID=999›. Wooldridge, L.C.P. “Methane Drainage in the Bowen Basin – Queensland.” 25 Aug. 1978. Queensland Digital Exploration Reports Database. Company Report 6626_1. Brisbane: Queensland Department of Resources and Mines. 31 May 2012 ‹https://qdexguest.deedi.qld.gov.au/portal/site/qdex/search?REPORT_ID=6626&COLLECTION_ID=999›.

In 2013, the Capricornia Arts Mob (CAM), an Indigenous collective of artists situated in Rockhampton, central Queensland, Australia, successfully tendered for one of three public art projects that were grouped under the title Flood Markers (Roberts; Roberts and Mackay; Robinson and Mackay). Commissioned as part of the Queensland Government's Community Development and Engagement Initiative, Flood Markers aims to increase awareness of Rockhampton’s history, with particular focus on the Fitzroy River and the phenomena of flooding. Honouring Land Connections is CAM’s contribution to the project and consists of several “memory poles” that stand alongside the Fitzroy River in Toonooba Park. Rockhampton lies on Dharumbal Country with Toonooba being the Dharumbal name for the Fitzroy River and the inspiration for the work due to its cultural significance to the Aboriginal people of that region. The name Toonooba, as well as other images and icons including boomerangs, spears, nets, water lily, and frogs, amongst others, are carved, burnt, painted and embedded into the large ironbark poles. These stand with the river on one side and the colonial infrastructure of Rockhampton on the other (see fig. 1, 2 and 3).Figure 1 Figure 2Figure 3Within this article, we discuss Honouring Land Connections as having two main functions which contribute to its significance as Indigenous cultural expression and identity affirmation. Firstly, the memory poles (as well as the process of sourcing materials and producing the final product) are a manifestation of Country and a representation of its stories and lived memories. Honouring Land Connections provides a means for Aboriginal people to revel in Country and maintain connections to a vital component of their being as Indigenous. Secondly, by revealing Indigenous stories, experiences, and memories, Honouring Land Connections emphasises Indigenous voices and perspectives within a place dominated by Eurocentric outlooks and knowledges. Toonooba provides the backdrop on which the complexities of cultural and identity formation within settler-colonial spaces are highlighted whilst revelling in continuous Indigenous presence.Flood Markers as ArtArtists throughout the world have used flood markers as a means of visual expression through which to explore and reveal local histories, events, environments, and socio-cultural understandings of the relationships between persons, places, and the phenomena of flooding. Geertz describes art as a social text embedded within wider socio-cultural systems; providing insight into cultural, social, political, economic, gendered, religious, ethnic, environmental, and biographical contexts. Flood markers are not merely metric tools used for measuring the height of a river, but rather serve as culture artefacts or indexes (Gell Art and Agency; Gell "Technology of Enchantment") that are products and producers of socio-culture contexts and the memories and experiences embedded within them. Through different methods, mediums, and images, artists have created experiential and intellectual spaces where those who encounter their work are encouraged to engage their surroundings in thought provoking and often-new ways.In some cases, flood markers have brought attention to the “character and natural history” of a particular place, where artists such as Louise Lavarack have sought to provoke consciousness of the movement of water across flood plains (Lavarack). In other works, flood markers have served as memorials to individuals such as Gilbert White whose daughter honoured his life and research through installing a glass spire at Boulder Creek, Colorado in 2011 (White). Tragedies such as Hurricane Katrina in New Orleans in 2005 have also been commemorated through flood markers. Artist Christopher Saucedo carved 1,836 waves into a freestanding granite block; each wave representing a life lost (University of New Orleans). The weight of the granite symbolises the endurance and resilience of those who faced, and will continue to face, similar forces of nature. The Pillar of Courage erected in 2011 in Ipswich, Queensland, similarly contains the words “resilience, community, strength, heroes, caring and unity” with each word printed on six separate sections of the pillar, representing the six major floods that have hit the region (Chudleigh).Whilst these flood markers provide valuable insights into local histories, specific to each environmental and socio-cultural context, works such as the Pillar of Courage fail to address Indigenous relationships to Country. By framing flooding as a “natural disaster” to be overcome, rather than an expression of Country to be listened to and understood, Euro and human-centric perspectives are prioritised over Indigenous ways of knowing and being. Indigenous knowledges however encourages a reorientation of Eurocentric responses and relationships to Country, and in doing so challenge compartmentalised views of “nature” where flooding is separated from land and Country (Ingold Perception; Seton and Bradley; Singer). Honouring Land Connections symbolises the voice and eternal presence of Toonooba and counters presentations of flooding that depict it as historian Heather Goodall (36) once saw “as unusual events of disorder in which the river leaves its proper place with catastrophic results.”Country To understand flooding from Indigenous perspectives it is first necessary to discuss Country and apprehend what it means for Indigenous peoples. Country refers to the physical, cosmological, geographical, relational, and emotional setting upon which Indigenous identities and connections to place and kin are embedded. Far from a passive geographic location upon which interactions take place, Country is an active and responsive agent that shapes and contextualises social interactions between and amongst all living beings. Bob Morgan writes of how “Country is more than issues of land and geography; it is about spirituality and identity, knowing who we are and who we are connected to; and it helps us understand how all living things are connected.” Country is also an epistemological frame that is filled with knowledge that may be known and familiarised whilst being knowledge itself (Langton "Sacred"; Rose Dingo; Yunupingu).Central to understanding Country is the fact that it refers to a living being’s spiritual homeland which is the ontological place where relationships are formed and maintained (Yunupingu). As Country nurtures and provides the necessities for survival and prosperity, Indigenous people (but also non-Indigenous populations) have moral obligations to care for Country as kin (Rose Nourishing Terrains). Country is epistemic, relational, and ontological and refers to both physical locations as well as modes of “being” (Heidegger), meaning it is carried from place to place as an embodiment within a person’s consciousness. Sally Morgan (263) describes how “our country is alive, and no matter where we go, our country never leaves us.” Country therefore is fluid and mobile for it is ontologically inseparable to one’s personhood, reflected through phrases such as “I am country” (B. Morgan 204).Country is in continuous dialogue with its surroundings and provides the setting upon which human and non-human beings; topographical features such as mountains and rivers; ancestral beings and spirits such as the Rainbow Snake; and ecological phenomena such as winds, tides, and floods, interact and mutually inform each other’s existence (Rose Nourishing Terrains). For Aboriginal people, understanding Country requires “deep listening” (Atkinson; Ungunmerr), a responsive awareness that moves beyond monological and human-centric understandings of the world and calls for deeper understandings of the mutual and co-dependant relationships that exist within it. The awareness of such mutuality has been discussed through terms such as “kincentrism” (Salmón), “meshworks” (Ingold Lines), “webs of connection” (Hokari), “nesting” (Malpas), and “native science” (Cajete). Such concepts are ways of theorising “place” as relational, physical, and mental locations made up of numerous smaller interactions, each of which contribute to the identity and meaning of place. Whilst each individual agent or object retains its own autonomy, such autonomy is dependent on its wider relation to others, meaning that place is a location where “objectivity, subjectivity and inter-subjectivity converge” (Malpas 35) and where the very essence of place is revealed.Flooding as DialogueWhen positioned within Indigenous frameworks, flooding is both an agent and expression of Toonooba and Country. For the phenomenon to occur however, numerous elements come into play such as the fall of rain; the layout of the surrounding terrain; human interference through built weirs and dams; and the actions and intervention of ancestral beings and spirits. Furthermore, flooding has a direct impact on Country and all life within it. This is highlighted by Dharumbal Elder Uncle Billy Mann (Fitzroy Basin Association "Billy Mann") who speaks of the importance of flooding in bringing water to inland lagoons which provide food sources for Dharumbal people, especially at times when the water in Toonooba is low. Such lagoons remain important places for fishing, hunting, recreational activities, and cultural practices but are reliant on the flow of water caused by the flowing, and at times flooding river, which Uncle Mann describes as the “lifeblood” of Dharumbal people and Country (Fitzroy Basin Association "Billy Mann"). Through her research in the Murray-Darling region of New South Wales, Weir writes of how flooding sustains life though cycles that contribute to ecological balance, providing nourishment and food sources for all beings (see also Cullen and Cullen 98). Water’s movement across land provokes the movement of animals such as mice and lizards, providing food for snakes. Frogs emerge from dry clay plains, finding newly made waterholes. Small aquatic organisms flourish and provide food sources for birds. Golden and silver perch spawn, and receding waters promote germination and growth. Aboriginal artist Ron Hurley depicts a similar cycle in a screen-print titled Waterlily–Darambal Totem. In this work Hurley shows floodwaters washing away old water lily roots that have been cooked in ant bed ovens as part of Dharumbal ceremonies (UQ Anthropology Museum). The cooking of the water lily exposes new seeds, which rains carry to nearby creeks and lagoons. The seeds take root and provide food sources for the following year. Cooking water lily during Dharumbal ceremonies contributes to securing and maintaining a sustainable food source as well as being part of Dharumbal cultural practice. Culture, ecological management, and everyday activity are mutually connected, along with being revealed and revelled in. Aboriginal Elder and ranger Uncle Fred Conway explains how Country teaches Aboriginal people to live in balance with their surroundings (Fitzroy Basin Association "Fred Conway"). As Country is in constant communication, numerous signifiers can be observed on land and waterscapes, indicating the most productive and sustainable time to pursue certain actions, source particular foods, or move to particular locations. The best time for fishing in central Queensland for example is when Wattles are in bloom, indicating a time when fish are “fatter and sweeter” (Fitzroy Basin Association "Fred Conway"). In this case, the Wattle is 1) autonomous, having its own life cycle; 2) mutually dependant, coming into being because of seasonal weather patterns; and 3) an agent of Country that teaches those with awareness how to respond and benefit from its lessons.Dialogue with Country As Country is sentient and responsive, it is vital that a person remains contextually aware of their actions on and towards their surroundings. Indigenous peoples seek familiarity with Country but also ensure that they themselves are known and familiarised by it (Rose Dingo). In a practice likened to “baptism”, Langton ("Earth") describes how Aboriginal Elders in Cape York pour water over the head of newcomers as a way of introducing them to Country, and ensuring that Country knows those who walk upon it. These introductions are done out of respect for Country and are a way of protecting outsiders from the potentially harmful powers of ancestral beings. Toussaint et al. similarly note how during mortuary rites, parents of the deceased take water from rivers and spit it back into the land, symbolising the spirit’s return to Country.Dharumbal man Robin Hatfield demonstrates the importance of not interfering with the dialogue of Country through recalling being told as a child not to disturb Barraru or green frogs. Memmott (78) writes that frogs share a relationship with the rain and flooding caused by Munda-gadda, the Rainbow Snake. Uncle Dougie Hatfield explains the significance of Munda-gadda to his Country stating how “our Aboriginal culture tells us that all the waterways, lagoons, creeks, rivers etc. and many landforms were created by and still are protected by the Moonda-Ngutta, what white people call the Rainbow Snake” (Memmott 79).In the case of Robin Hatfield, to interfere with Barraru’s “business” is to threaten its dialogue with Munda-gadda and in turn the dialogue of Country in form of rain. In addition to disrupting the relational balance between the frog and Munda-gadda, such actions potentially have far-reaching social and cosmological consequences. The rain’s disruption affects the flood plains, which has direct consequences for local flora and transportation and germination of water lily seeds; fauna, affecting the spawning of fish and their movement into lagoons; and ancestral beings such as Munda-gadda who continue to reside within Toonooba.Honouring Land Connections provided artists with a means to enter their own dialogue with Country and explore, discuss, engage, negotiate, and affirm aspects of their indigeneity. The artists wanted the artwork to remain organic to demonstrate honour and respect for Dharumbal connections with Country (Roberts). This meant that materials were sourced from the surrounding Country and the poles placed in a wave-like pattern resembling Munda-gadda. Alongside the designs and symbols painted and carved into the poles, fish skins, birds, nests, and frogs are embalmed within cavities that are cut into the wood, acting as windows that allow viewers to witness components of Country that are often overlooked (see fig. 4). Country therefore is an equal participant within the artwork’s creation and continuing memories and stories. More than a representation of Country, Honouring Land Connections is a literal manifestation of it.Figure 4Opening Dialogue with Non-Indigenous AustraliaHonouring Land Connections is an artistic and cultural expression that revels in Indigenous understandings of place. The installation however remains positioned within a contested “hybrid” setting that is informed by both Indigenous and settler-colonial outlooks (Bhabha). The installation for example is separated from the other two artworks of Flood Markers that explore Rockhampton’s colonial and industrial history. Whilst these are positioned within a landscaped area, Honouring Land Connections is placed where the grass is dying, seating is lacking, and is situated next to a dilapidated coast guard building. It is a location that is as quickly left behind as it is encountered. Its separation from the other two works is further emphasised through its depiction in the project brief as a representation of Rockhampton’s pre-colonial history. Presenting it in such a way has the effect of bookending Aboriginal culture in relation to European settlement, suggesting that its themes belong to a time past rather than an immediate present. Almost as if it is a revelation in and of itself. Within settler-colonial settings, place is heavily politicised and often contested. In what can be seen as an ongoing form of colonialism, Eurocentric epistemologies and understandings of place continue to dominate public thought, rhetoric, and action in ways that legitimise White positionality whilst questioning and/or subjugating other ways of knowing, being, and doing (K. Martin; Moreton-Robinson; Wolfe). This turns places such as Toonooba into agonistic locations of contrasting and competing interests (Bradfield). For many Aboriginal peoples, the memories and emotions attached to a particular place can render it as either comfortable and culturally safe, or as unsafe, unsuitable, unwelcoming, and exclusionary (Fredericks). Honouring Land Connections is one way of publicly asserting and recognising Toonooba as a culturally safe, welcoming, and deeply meaningful place for Indigenous peoples. Whilst the themes explored in Honouring Land Connections are not overtly political, its presence on colonised/invaded land unsettles Eurocentric falsities and colonial amnesia (B. Martin) of an uncontested place and history in which Indigenous voices and knowledges are silenced. The artwork is a physical reminder that encourages awareness—particularly for non-Indigenous populations—of Indigenous voices that are continuously demanding recognition of Aboriginal place within Country. Similar to the boomerangs carved into the poles representing flooding as a natural expression of Country that will return (see fig. 5), Indigenous peoples continue to demand that the wider non-Indigenous population acknowledge, respect, and morally responded to Aboriginal cultures and knowledges.Figure 5Conclusion Far from a historic account of the past, the artists of CAM have created an artwork that promotes awareness of an immediate and emerging Indigenous presence on Country. It creates a space that is welcoming to Indigenous people, allowing them to engage with and affirm aspects of their living histories and cultural identities. Through sharing stories and providing “windows” into Aboriginal culture, Country, and lived experiences (which like the frogs of Toonooba are so often overlooked), the memory poles invite and welcome an open dialogue with non-Indigenous Australians where all may consider their shared presence and mutual dependence on each other and their surroundings.The memory poles are mediatory agents that stand on Country, revealing and bearing witness to the survival, resistance, tenacity, and continuity of Aboriginal peoples within the Rockhampton region and along Toonooba. Honouring Land Connections is not simply a means of reclaiming the river as an Indigenous space, for reclamation signifies something regained after it has been lost. What the memory poles signify is something eternally present, i.e. Toonooba is and forever will be embedded in Aboriginal Country in which we all, Indigenous and non-Indigenous, human and non-human, share. The memory poles serve as lasting reminders of whose Country Rockhampton is on and describes the life ways of that Country, including times of flood. Through celebrating and revelling in the presence of Country, the artists of CAM are revealing the deep connection they have to Country to the wider non-Indigenous community.ReferencesAtkinson, Judy. Trauma Trails, Recreating Song Lines: The Transgenerational Effects of Trauma in Indigenous Australia. Spinifex Press, 2002.Bhabha, Homi, K. The Location of Culture. Taylor and Francis, 2012.Bradfield, Abraham. "Decolonizing the Intercultural: A Call for Decolonizing Consciousness in Settler-Colonial Australia." Religions 10.8 (2019): 469.Cajete, Gregory. Native Science: Natural Laws of Interdependence. 1st ed. Clear Light Publishers, 2000.Chudleigh, Jane. "Flood Memorial Called 'Pillar of Courage' Unveiled in Goodna to Mark the Anniversary of the Natural Disaster." The Courier Mail 2012. 16 Jan. 2020 <http://www.couriermail.com.au/questnews/flood-memorial-called-pillar-of-courage-unveiled-in-goodna-to-mark-the-anniversary-of-the-natural-disaster/news-story/575b1a8c44cdd6863da72d64f9e96f2d>.Cullen, Peter, and Vicky Cullen. This Land, Our Water: Water Challenges for the 21st Century. ATF P, 2011.Fitzroy Basin Association. "Carnarvon Gorge with Fred Conway." 8 Dec. 2010 <https://www.youtube.com/watch?v=RbOP60JOfYo>.———. "The Fitzroy River with Billy Mann." 8 Dec. 2019 <https://www.youtube.com/watch?v=00ELbpIUa_Y>.Fredericks, Bronwyn. "Understanding and Living Respectfully within Indigenous Places." Indigenous Places: World Indigenous Nations Higher Education Consortium Journal 4 (2008): 43-49.Geertz, Clifford. "Art as a Cultural System." MLN 91.6 (1976): 1473-99.Gell, Alfred. Art and Agency: An Anthropological Theory. Clarendon P, 1998.———. "The Technology of Enchantment and the Enchantment of Technology." Anthropology, Art, and Aesthetics, eds. J. Coote and A. Shelton. Clarendon P, 1992. 40-63.Goodall, Heather. "The River Runs Backwards." Words for Country: Landscape & Language in Australia, eds. Tim Bonyhady and Tom Griffiths. U of New South Wales P, 2002. 30-51.Heidegger, Martin. Being and Time. 1st English ed. SCM P, 1962.Hokari, Minoru. Gurindji Journey: A Japanese Historian in the Outback. U of New South Wales P, 2011.Ingold, Tim. Lines: A Brief History. Routledge, 2007.———. The Perception of the Environment: Essays on Livelihood, Dwelling & Skill. Routledge, 2000.Langton, Marcia. "Earth, Wind, Fire and Water: The Social and Spiritual Construction of Water in Aboriginal Societies." Social Archaeology of Australian Indigenous Societies, eds. Bruno David et al. Aboriginal Studies P, 2006. 139-60.———. "The Edge of the Sacred, the Edge of Death: Sensual Inscriptions." Inscribed Landscapes: Marking and Making Place, eds. Bruno David and M. Wilson. U of Hawaii P, 2002. 253-69.Lavarack, Louise. "Threshold." 17 Jan. 2019 <http://www.louiselavarack.com.au/>.Malpas, Jeff. Place and Experience: A Philosophical Topography. Cambridge UP, 1999.Martin, Brian. "Immaterial Land." Carnal Knowledge: Towards a 'New Materialism' through the Arts, eds. E. Barret and B. Bolt. Tauris, 2013. 185-04.Martin, Karen Lillian. Please Knock before You Enter: Aboriginal Regulation of Outsiders and the Implications for Researchers. Post Pressed, 2008.Memmott, Paul. "Research Report 10: Aboriginal Social History and Land Affiliation in the Rockhampton-Shoalwater Bay Region." Commonwealth Commission of Inquiry, Shoalwater Bay Capricornia Coast, Queensland: Research Reports, ed. John T. Woodward. A.G.P.S., 1994. 1-107.Moreton-Robinson, Aileen. The White Possessive: Property, Power, and Indigenous Sovereignty. U of Minnesota P, 2015.Morgan, Bob. "Country – a Journey to Cultural and Spiritual Healing." Heartsick for Country: Stories of Love, Spirit and Creation, eds. S. Morgan et al. Freemantle P, 2008: 201-20.Roberts, Alice. "Flood Markers Unveiled on Fitzroy." ABC News 5 Mar. 2014. 10 Mar. 2014 <https://www.abc.net.au/local/photos/2014/03/05/3957151.htm>.Roberts, Alice, and Jacquie Mackay. "Flood Artworks Revealed on Fitzroy Riverbank." ABC Capricornia 29 Oct. 2013. 5 Jan. 20104 <http://www.abc.net.au/local/stories/2013/10/29/3879048.htm?site=capricornia>.Robinson, Paul, and Jacquie Mackay. "Artwork Portray Flood Impact." ABC Capricornia 29 Oct. 2013. 5 Jan. 2014 <http://www.abc.net.au/lnews/2013-10-29/artworks-portray-flood-impact/5051856>.Rose, Deborah Bird. Dingo Makes Us Human: Life and Land in an Aboriginal Australian Culture. Cambridge UP, 1992.———. Nourishing Terrains: Australian Aboriginal Views of Landscape and Wilderness. Australian Heritage Commission, 1996.Salmón, Enrique. "Kincentric Ecology: Indigenous Perceptions of the Human-Nature Relationship." Ecological Applications 10.5 (2000): 1327-32.Seton, Kathryn A., and John J. Bradley. "'When You Have No Law You Are Nothing': Cane Toads, Social Consequences and Management Issues." The Asia Pacific Journal of Anthropology 5.3 (2004): 205-25.Singer, Peter. Practical Ethics. 3rd ed. Cambridge UP, 2011.Toussaint, Sandy, et al. "Water Ways in Aboriginal Australia: An Interconnected Analysis." Anthropological Forum 15.1 (2005): 61-74.Ungunmerr, Miriam-Rose. "To Be Listened To in Her Teaching: Dadirri: Inner Deep Listening and Quiet Still Awareness." EarthSong Journal: Perspectives in Ecology, Spirituality and Education 3.4 (2017): 14-15.University of New Orleans. "Fine Arts at the University of New Orleans: Christopher Saucedo." 31 Aug. 2013 <http://finearts.uno.edu/christophersaucedofaculty.html>.UQ Anthropology Museum. "UQ Anthropology Museum: Online Catalogue." 6 Dec. 2019 <https://catalogue.anthropologymuseum.uq.edu.au/item/26030>.Weir, Jessica. Murray River Country: An Ecological Dialogue with Traditional Owners. Aboriginal Studies Press, 2009.White, Mary Bayard. "Boulder Creek Flood Level Marker Projects." WEAD: Women Eco Artists Dialog. 15 Jan. 2020 <https://directory.weadartists.org/colorado-marking-floods>.Wolfe, Patrick. "Settler Colonialism and the Elimination of the Native." Journal of Genocide Research 8.4 (2006): 387-409.Yunupingu, Galarrwuy. Our Land Is Our Life: Land Rights – Past, Present and Future. University of Queensland Press, 1997.