Journal articles on the topic 'Catchment management'
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Stosch, Kathleen C., Richard S. Quilliam, Nils Bunnefeld, and David M. Oliver. "Rapid Characterisation of Stakeholder Networks in Three Catchments Reveals Contrasting Land-Water Management Issues." Land 11, no. 12 (December 18, 2022): 2324. http://dx.doi.org/10.3390/land11122324.
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Catchments are socio-ecological systems integrating land, water and people with diverse roles and views. Characterising stakeholder networks and their levels of influence and interaction within catchments can help deliver more effective land and water management. In this study, we combined stakeholder analysis and social network methods to provide a novel stakeholder-mapping tool capable of identifying interactions among the land and water management communities across three contrasting study catchments. The overarching aim was to characterise the influence of different stakeholders involved in catchment management based on the perceptions of participants from four key stakeholder groups (Environmental Regulators, Water Industry Practitioners, the Farm Advisor Community, and Academics). A total of 43 participants identified 28 types of specific catchment management stakeholder groups with either core or peripheral importance to our three case study catchments. Participants contributed 490 individual scores relating to the perceived influence of these different stakeholder groups and categorised whether this influence was positive, negative or neutral for the management of catchment resources. Local Government, Farmers and Environmental Regulators were perceived to have the greatest level of influence. Social network analysis further determined which stakeholders were most commonly connected in all of the study catchments and hence formed the core of stakeholder networks in each catchment. Comparing outputs from the analysis of three contrasting river catchments, as well as between participants from four key stakeholder groups allowed identification of which stakeholders were more central to the catchment management networks. Such analyses could help facilitate effective communication within land and water management stakeholder networks by targeting highly connected opinion leaders or promoting peer learning via distinct catchment subgroups.
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Grobicki, A. M. W. "Urban catchment management in a developing country: the Lotus River project, Cape Town, South Africa." Water Science and Technology 44, no. 2-3 (July 1, 2001): 313–19. http://dx.doi.org/10.2166/wst.2001.0784.
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This paper describes a 2-year pilot project undertaken in an urban catchment in Cape Town, South Africa. The impermeable area of the Lotus River catchment has doubled over 15 years, from 17% in 1983 to 34% in 1997. Following the abolition of urban influx control in 1990, informal settlements in the catchment grew rapidly and now house about 90,000 out of the catchment's total population of 380,000 people. The informal areas are still largely unserviced, despite a commitment from local government to speed up service delivery to the poorest areas of the city. Within the Lotus River project, hydrological and ecological assessments of the urban watercourses were undertaken, through physico-chemical and microbiological sampling programmes, macro-invertebrate counts, and vegetation sampling. All available information regarding the catchment was integrated within a GIS platform, including demographic and socio-economic data on the various communities, and hydrogeological information on the underlying aquifer obtained from earlier studies. The integrated nature of the project allows a number of conclusions and recommendations to be drawn, regarding the management of this particular catchment. However, important general lessons have also been learned which can be applied by local authorities responsible for urban catchments in developing countries. The necessity of providing the required institutional structures cannot be overemphasised.
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Carroll, C., K. Rohde, G. Millar, C. Dougall, S. Stevens, R. Ritchie, and S. Lewis. "Neighbourhood catchments: a new approach for achieving ownership and change in catchment and stream management." Water Science and Technology 45, no. 11 (June 1, 2002): 185–91. http://dx.doi.org/10.2166/wst.2002.0394.
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The Neighbourhood Catchment approach integrates land and stream management practices at a property and through to a local catchment scale, links production and environmental goals, and is a building block to achieve ownership and change at a sub-catchment scale and larger. Research conducted in two 'focus' Neighbourhood Catchments has shown that land management practices that retain >30% soil cover reduce sediment movement to streams. The Neighbourhood Catchment approach engages both early and cautious adopters, and enables continuous improvement of resource management to take place, and be recorded at an individual property and local catchment scale.
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Pickard, Amy E., Marcella Branagan, Mike F. Billett, Roxane Andersen, and Kerry J. Dinsmore. "Effects of peatland management on aquatic carbon concentrations and fluxes." Biogeosciences 19, no. 5 (March 4, 2022): 1321–34. http://dx.doi.org/10.5194/bg-19-1321-2022.
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Abstract. Direct land-to-atmosphere carbon exchange has been the primary focus in previous studies of peatland disturbance and subsequent restoration. However, loss of carbon via the fluvial pathway is a significant term in peatland carbon budgets and requires consideration to assess the overall impact of restoration measures. This study aimed to determine the effect of peatland land management regime on aquatic carbon concentrations and fluxes in an area within the UK's largest tract of blanket bog, the Flow Country of northern Scotland. Three sub-catchments were selected to represent peatland land management types: non-drained, drained, and restoration (achieved through drain blocking and tree removal). Water samples were collected on a fortnightly basis from September 2008 to August 2010 at six sampling sites, one located upstream and one downstream within each sub-catchment. Concentrations of dissolved organic carbon (DOC) were significantly lower for the upstream non-drained sub-catchment compared to the drained sub-catchments, and there was considerable variation in the speciation of aquatic carbon (DOC, particulate organic carbon (POC), CO2, and CH4) across the monitoring sites, with dissolved gas concentrations inversely correlated with catchment area and thereby contributing considerably more to total aquatic carbon in the smaller headwater catchments. Significantly higher POC concentrations were observed in the restored sub-catchment most affected by tree removal. Aquatic carbon fluxes were highest from the drained catchments and lowest from the non-drained catchments at 23.5 and 7.9 g C m−2 yr−1, respectively, with variability between the upstream and downstream sites within each catchment being very low. It is clear from both the aquatic carbon concentration and flux data that drainage has had a profound impact on the hydrological and biogeochemical functioning of the peatland. In the restoration catchment, carbon export varied considerably, from 21.1 g C m−2 yr−1 at the upper site to 10.0 g C m−2 yr−1 at the lower site, largely due to differences in runoff generation. As a result of this hydrological variability, it is difficult to make definitive conclusions about the impact of restoration on carbon fluxes, and further monitoring is needed to corroborate the longer-term effects.
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Booth, C. A., A. Warianti, and T. Wrigley. "Establishing an Integrated Catchment Management (ICM) program in East Java, Indonesia." Water Science and Technology 43, no. 9 (May 1, 2001): 227–34. http://dx.doi.org/10.2166/wst.2001.0545.
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The Brantas is one of Indonesia's most important catchments. It is the “rice bowl” of Java and nationally important for its industrial activity. Surabaya, Indonesia's second largest city, is located at the mouth of the Brantas River which is pivotal to the city's water supply. The challenges associated with the institutional framework for natural resource management in East Java parallels that of many states and provinces around the globe. It is multi-layered and complex. Integrated Catchment Management (ICM) may be defined as “the co-ordinated and sustainable management of land, water, soil vegetation, fauna and other natural resources on a water catchment basis”. Over a period of six months, an ICM Strategy was researched and facilitated for the Brantas River Catchment in East Java via a short term advisor attachment. The aim of the Strategy is to improve co-ordination, co-operation, communication and consistency of government and community efforts towards sustaining the catchment's environmental, economic and social values. The attachment was part of the Pollution Control Implementation (PCI) Project funded by AusAid and the Indonesian Government. The ICM Strategy developed was broad based and addressed the priority natural resource management issues facing the Brantas Catchment. It was co-ordinated by BAPEDALDA, the Provincial Environmental Protection Agency, and developed by all agencies involved in natural resource management in the catchment. Various Universities and Non Government Organisations (NGOs) were also involved in the ICM process which developed the Strategy. At the conclusion of the attachment, a draft ICM Strategy and a proposed institutional framework had been developed. A working group of key agencies was also established to further enhance local “ownership”, finalise timescales and implementation responsibilities within the Strategy and bring the institutional arrangements into being through a Governor's Decree.
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Oliver, P. "What makes catchment management groups “tick”?" Water Science and Technology 43, no. 9 (May 1, 2001): 263–72. http://dx.doi.org/10.2166/wst.2001.0555.
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The work of catchment management groups throughout Australia represents a significant economic and social investment in natural resource management. Institutional structures and policies, the role of on-ground coordinators, facilitation processes, citizen participation and social capital are critical factors influencing the success of catchment management groups. From a participant-researcher viewpoint, this paper signposts research directions and themes that are being pursued from the participant/coordinator, catchment group, and lead government/non-government agency perspective on the influence of these factors on the success of a catchment management group in the Pumicestone Region of Southeast Queensland, Australia. Research directions, themes and discussion/reflection points for practitioners include - the importance of understanding milieu; motivation; success; having fun; "networking networks"; involvement of "non-traditional" stakeholders; development of stakeholder/participant partnerships; learning from other practitioners; methods of stakeholder/participant representation; evaluation; the need for guiding principles or philosophy; the equivalence of planning, implementation, evaluation, and resourcing; catchments as fundamental units of Nature; continuity of support for groups; recognising a new role for government; working with existing networks; and the need for an eclectic approach to natural resource management.
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Stosch, Kathleen C., Richard S. Quilliam, Nils Bunnefeld, and David M. Oliver. "Catchment-Scale Participatory Mapping Identifies Stakeholder Perceptions of Land and Water Management Conflicts." Land 11, no. 2 (February 16, 2022): 300. http://dx.doi.org/10.3390/land11020300.
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Competing socioecological demands and pressures on land and water resources have the potential to increase land use conflict. Understanding ecosystem service provisioning and trade-offs, competing land uses, and conflict between stakeholder groups in catchments is therefore critical to inform catchment management and the sustainable use of natural resources. We developed a novel stakeholder engagement methodology that incorporates participatory conflict mapping in three catchments with a short questionnaire to identify the perceptions of 43 participants from four key land and water management stakeholder groups: environmental regulators, water industry practitioners, the farm advisor community, and academics. The participatory mapping exercise produced heat maps of perceived conflict and land use competition, providing spatial detail of the complex combination of land use issues faced by catchment managers. Distinct, localised hotspots were identified in areas under pressure from flooding, abstraction, and urbanisation; as well as more dispersed issues of relevance at the landscape scale, such as from farming, forestry, energy production, and tourism. Subsequent regression modelling linked perceived conflict to land cover maps and identified coastal, urban, and grassland areas as the most likely land cover types associated with conflict in the study catchments. Our approach to participatory conflict mapping provides a novel platform for catchment management and can facilitate increased cooperation among different catchment stakeholders. In turn, land and water management conflicts can be recognised and their underlying drivers and likely solutions identified in an effort to better manage competing demands on catchment resources.
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L. Badgett, LTC Arthur. "Catchment area management." Journal of Ambulatory Care Management 13, no. 3 (July 1990): 1–6. http://dx.doi.org/10.1097/00004479-199007000-00004.
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Green, Colin. "Transnational catchment management." Political Geography 28, no. 3 (March 2009): 208–9. http://dx.doi.org/10.1016/j.polgeo.2009.05.001.
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Falconer, Roger A., and Richard Harpin. "Catchment Flood Management." Water International 30, no. 1 (March 2005): 5–13. http://dx.doi.org/10.1080/02508060508691831.
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Sharpley, Andrew, William Gburek, and Louise Heathwaite. "Agricultural phosphorus and water quality: sources, transport and management." Agricultural and Food Science 7, no. 2 (January 1, 1998): 297–314. http://dx.doi.org/10.23986/afsci.72855.
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Freshwater eutrophication is usually controlled by inputs of phosphorus (P). To identify critical sources of P export from agricultural catchments we investigated hydrological and chemical factors controlling P export from a mixed land use (30% wooded, 50% cultivated, 20% pasture) 39.5-ha catchment in east-central Pennsylvania, USA. Mehlich-3 extractable soil P, determined on a 30-m grid over the catchment, ranged from 7 to 788 mg kg-1. Generally, soils in wooded areas had low Mehlich-3P (
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Kovacs, A. S., M. Honti, and A. Clement. "Design of best management practice applications for diffuse phosphorus pollution using interactive GIS." Water Science and Technology 57, no. 11 (June 1, 2008): 1727–33. http://dx.doi.org/10.2166/wst.2008.264.
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The paper presents a complex environmental engineering tool, which is appropriate to support decision making in watershed management. The PhosFate tool allows planning best management practices (BMPs) in catchments and simulating their possible impacts on immissions. The method has two parts: (a) a simple phosphorus (P) fate model to calculate diffuse P emissions and their surface transport, and (b) an interactive tool to design BMPs in small catchments. The fate model calculates diffuse P emissions via surface pathways. It is a conceptual, distributed parameter and long-term (annual) average model. The model also follows the fate of emitted P from each cell to the catchment outlets and calculates the field and in-stream retention. The fate model performed well in the Zala River catchment as a case study. Finally, an interactive design tool was developed to plan BMPs in the catchments and simulate their possible impacts on diffuse P fluxes. Different management scenarios were worked out and their effects evaluated and compared to each other. The results show that the approach is suitable to test BMP scenarios at small catchment scale.
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Uhlenbrook, S., Y. Mohamed, and A. S. Gragne. "Analyzing catchment behavior through catchment modeling in the Gilgel Abay, Upper Blue Nile River Basin, Ethiopia." Hydrology and Earth System Sciences 14, no. 10 (October 29, 2010): 2153–65. http://dx.doi.org/10.5194/hess-14-2153-2010.
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Abstract. Understanding catchment hydrological processes is essential for water resources management, in particular in data scarce regions. The Gilgel Abay catchment (a major tributary into Lake Tana, source of the Blue Nile) is undergoing intensive plans for water management, which is part of larger development plans in the Blue Nile basin in Ethiopia. To obtain a better understanding of the water balance dynamics and runoff generation mechanisms and to evaluate model transferability, catchment modeling has been conducted using the conceptual hydrological model HBV. Accordingly, the catchment of the Gilgel Abay has been divided into two gauged sub-catchments (Upper Gilgel Abay and Koga) and the un-gauged part of the catchment. All available data sets were tested for stationarity, consistency and homogeneity and the data limitations (quality and quantity) are discussed. Manual calibration of the daily models for three different catchment representations, i.e. (i) lumped, (ii) lumped with multiple vegetation zones, and (iii) semi-distributed with multiple vegetation and elevation zones, showed good to satisfactory model performances with Nash-Sutcliffe efficiencies Reff > 0.75 and > 0.6 for the Upper Gilgel Abay and Koga sub-catchments, respectively. Better model results could not be obtained with manual calibration, very likely due to the limited data quality and model insufficiencies. Increasing the computation time step to 15 and 30 days improved the model performance in both sub-catchments to Reff > 0.8. Model parameter transferability tests have been conducted by interchanging parameters sets between the two gauged sub-catchments. Results showed poor performances for the daily models (0.30 < Reff < 0.67), but better performances for the 15 and 30 days models, Reff > 0.80. The transferability tests together with a sensitivity analysis using Monte Carlo simulations (more than 1 million model runs per catchment representation) explained the different hydrologic responses of the two sub-catchments, which seems to be mainly caused by the presence of dambos in Koga sub-catchment. It is concluded that daily model transferability is not feasible, while it can produce acceptable results for the 15 and 30 days models. This is very useful for water resources planning and management, but not sufficient to capture detailed hydrological processes in an ungauged area.
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Tennant, W., and J. Sheed. "Managing waterway health in the Goulburn Broken Catchment, Victoria, Australia." Water Science and Technology 43, no. 9 (May 1, 2001): 29–36. http://dx.doi.org/10.2166/wst.2001.0502.
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Historically within most catchments, resource management programs have been planned and implemented in isolation of one another. This was once the case in the Goulburn Broken Catchment, a major catchment of the Murray Darling Basin, Australia. Although only 2% of the Murray Darling Basin's land area, the catchment generates 11% of the basin's water resources. Learning from the past, a cooperative and collaborative approach to natural resource programs has developed. This approach is the envy of many other catchment communities and agencies. Through a combination of “Partnership Programs”, “Operational Initiatives” and community involvement, significant programs have been implemented within the catchment, which will benefit not only the local community but communities further afield. The outcomes of the waterway health program highlight the benefits provided through the establishment of cooperative and partnership resource improvement programs. These programs were founded on the ability of the community to recognise the need for integration, base management decisions on best available science and an ability to work together. Their effective delivery has been provided through the resources provided, to the local community, by the Natural Heritage Trust with matching and State and local allocations. While programs have shown success, challenges still face the community. These challenges include verification and implementation of environmental flows, storage of the catchment's vital water resources, and maintaining community involvement and participation in on-going works programs. The Goulburn Broken Catchment community, with the support of Federal, State and Local Governments, is looking at opportunities for continued improvements in waterway health.
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Yillia, P. T., and N. Kreuzinger. "Net flux of pollutants at a reduced spatial scale - an index of catchment vulnerability." Water Science and Technology 59, no. 1 (January 1, 2009): 109–16. http://dx.doi.org/10.2166/wst.2009.568.
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Emissions and riverine loads of pollutants were estimated for five sub-catchments in the Njoro River Catchment, Kenya to isolate specific areas for interim pollution management. The most vulnerable sub-catchments were the densely settled and heavily farmed areas around Egerton University and Njoro Township with the restricted area between them demonstrating a remarkable potential to retain/remove most of the pollution emitted in the Egerton University area. The least vulnerable sub-catchment was the predominantly forested Upper Njoro River Catchment whereas the recently settled and increasingly farmed Lower Little Shuru was moderately vulnerability. The method provided a scientific framework for the rapid assessment of catchment vulnerability to prioritize areas for remediation.
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Wygralak, Andrew S. "Daly River Catchment — towards an integrated catchment management." ASEG Extended Abstracts 2006, no. 1 (December 2006): 1–9. http://dx.doi.org/10.1071/aseg2006ab200.
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Peng, Yingxiang, Xinliang Liu, and Yi Wang. "Incorporating Landscape Scaling Relations into Catchment Classification for Optimizing Ecological Management." Sustainability 14, no. 9 (April 30, 2022): 5408. http://dx.doi.org/10.3390/su14095408.
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The landscape scaling relation challenges catchment ecological management; however, how the scaling relations change among naturally and anthropogenically differentiated catchments is still unknown. In this study, approximately 1500 soil samples were determined; more than 800 households were surveyed; and the landscape pattern was investigated in 120 sub-catchments of a subtropical Chinese urbanizing agricultural catchment. A scalogram and a coefficient of variation of the commonly used landscape metrics were estimated among various grain sizes, to quantify the Strength of Landscape Scale Effects (SSE) among sub-catchments. Natural and anthropogenic determinants for the SSE were determined. Then, the determinants incorporating landscape scaling relation were applied to classify the sub-catchments through the k-means clustering analysis. The SSE presented different spatial heterogeneity across the 120 sub-catchments and was not expectedly related to the scaling relation over the entire catchment, especially for the Contagion index and Shannon’s Evenness Index. The SSE were significantly related to natural and anthropogenic factors including the soil sand content, the population density, the relief ratio, and the ratio of arable land to woodland. The four factors combing with landscape scaling relations contributed to the four gratifying convergent categories for the 120 sub-catchments. Category I with a large relief and less anthropogenic disturbance had higher spatially non-stationary relationship, while categories II, III, and IV, with varying degrees of relatively small relief and strong intensities of anthropogenic disturbance, had a lower spatial heterogeneity of the landscape scaling relation. The results implied that category I was required to strengthen environmental protection of spatial differences, and categories II, III, and IV could ignore the landscape scale effects and even upscaling management to save management resources when carrying out ecological management within. Our findings could minimize uncertainty in ecological planning and provide opportunities for the application of multiple-scale management.
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Barnsley, Imogen, Rebecca Spake, Justin Sheffield, Julian Leyland, Tim Sykes, and David Sear. "Exploring the Capability of Natural Flood Management Approaches in Groundwater-Dominated Chalk Streams." Water 13, no. 16 (August 13, 2021): 2212. http://dx.doi.org/10.3390/w13162212.
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This study aims to address the gap in the Natural Flood Management (NFM) evidence base concerning its implementation potential in groundwater-dominated catchments. We generated a typology of 198 chalk catchments using redundancy analysis and hierarchical clustering. Three catchment typologies were identified: (1) large catchments, (2) headwater catchments with permeable soils, and (3) catchments with impermeable soils and surfaces (urban and suburban land uses). The literature suggests that natural flood management application is most effective for catchments <20 km2, reducing the likelihood of significant flood mitigation in large catchments. The relatively lower proportion of surface runoff and higher recharge in permeable catchments diminishes natural flood management’s likely efficacy. Impermeable catchments are most suited to natural flood management due to a wide variety of flow pathways, making the full suite of natural flood management interventions applicable. Detailed groundwater flood maps and hydrological models are required to identify catchments where NFM can be used in a targeted manner to de-synchronise sub-catchment flood waves or to intercept runoff generated via groundwater emergence. Whilst our analysis suggests that most chalk groundwater-dominated catchments in this sample are unlikely to benefit from significant flood reductions due to natural flood management, the positive impact on ecosystem services and biodiversity makes it an attractive proposition.
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Procházka, J., J. Brom, and L. Pechar. "The comparison of water and matter flows in three small catchments in the Šumava Mountains." Soil and Water Research 4, Special Issue 2 (March 19, 2010): S75—S82. http://dx.doi.org/10.17221/481-swr.
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The comparisons of water and matter flows have been evaluated in three small catchments with different land uses in the Šumava Mountains in the south-west of the Czech Republic since 1999. The catchment of the Mlýnský stream was artificially drained, the areas of the catchment retaining the character of drained, semi‑intensive pasture. The catchment of the Horský stream is covered with forest, mowed meadows, and locations with natural succession (wetlands). The catchment of the Bukový stream is covered with forest, mostly with spruce monoculture. The highest amount of water was discharged from the drained Mlýnský catchment whereas the amounts of water discharged from the Horský and Bukový catchments were lower. The runoff maxima in the hydrologic year of 2002 were recorded in the Mlýnský stream catchment in August – at the time of the catastrophic floods. On the other hand, the maximum discharges in the Horský and Bukový stream catchments in August 2002 were comparable with those that occurred in the spring during the snow melt. In comparison, the water chemistry showed relationships between trends and features and the results of water runoff. The comparison of the runoff and matter flows in the catchments studied confirmed the influence of the land cover and management in both normal and extreme rainfall-runoff conditions.
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Ferguson, Christobel M., Barry F. W. Croke, Peter J. Beatson, Nicholas J. Ashbolt, and Daniel A. Deere. "Development of a process-based model to predict pathogen budgets for the Sydney drinking water catchment." Journal of Water and Health 5, no. 2 (June 1, 2007): 187–208. http://dx.doi.org/10.2166/wh.2007.013b.
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In drinking water catchments, reduction of pathogen loads delivered to reservoirs is an important priority for the management of raw source water quality. To assist with the evaluation of management options, a process-based mathematical model (pathogen catchment budgets - PCB) is developed to predict Cryptosporidium, Giardia and E. coli loads generated within and exported from drinking water catchments. The model quantifies the key processes affecting the generation and transport of microorganisms from humans and animals using land use and flow data, and catchment specific information including point sources such as sewage treatment plants and on-site systems. The resultant pathogen catchment budgets (PCB) can be used to prioritize the implementation of control measures for the reduction of pathogen risks to drinking water. The model is applied in the Wingecarribee catchment and used to rank those sub-catchments that would contribute the highest pathogen loads in dry weather, and in intermediate and large wet weather events. A sensitivity analysis of the model identifies that pathogen excretion rates from animals and humans, and manure mobilization rates are significant factors determining the output of the model and thus warrant further investigation.
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Wearing, Cameron, Dr Jeremy Cheesman, Steven Skull, Gayathri Ramachandran, and Katie Henderson. "CATCHMENT MANAGEMENT INVESTMENT STANDARD." Water e-Journal 1, no. 3 (2016): 1–7. http://dx.doi.org/10.21139/wej.2016.033.
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CHANDLER, J. "Integrated Catchment Management Planning." Water and Environment Journal 8, no. 1 (February 1994): 93–96. http://dx.doi.org/10.1111/j.1747-6593.1994.tb01097.x.
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Morokong, Tshepo, James Blignaut, Nonophile Nkambule, Shepherd Mudhavanhu, and Thulile Vundla. "Clearing invasive alien plants as a cost-effective strategy for water catchment management: The case of the Olifants river catchment, South Africa." South African Journal of Economic and Management Sciences 19, no. 5 (December 12, 2016): 774–87. http://dx.doi.org/10.4102/sajems.v19i5.1594.
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Invasive alien plants have a negative impact on ecosystem goods and services derived from ecosystems. Consequently, the aggressive spread of invasive alien plants (IAPs) in the river catchments of South Africa is a major threat to, inter alia, water security. The Olifants River catchment is one such a catchment that is under pressure because of the high demand for water from mainly industrial sources and unsustainable land-use, which includes IAPs. This study considered the cost-effectiveness of clearing IAPs and compared these with the cost of a recently constructed dam. The methods used for data collection were semistructured interviews, site observation, desktop data analysis, and a literature review to assess the impact of IAPs on the catchment’s water supply. The outcomes of this study indicate that clearing invasive alien plants is a cost-effective intervention with a Unit Reference Value (URV) of R1.44/m3, which compares very favourably with that of the De Hoop dam, the URV for which is R2.93/m3. These results suggest that clearing invasive alien plants is a cost-effective way of catchment management, as the opportunity cost of not doing so (forfeiting water to the value of R2.93/m3) is higher than that of protecting the investment in the dam.
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Ferguson, C. M., N. J. Ashbolt, and D. A. Deere. "Prioritisation of catchment management in the Sydney catchment - construction of a pathogen budget." Water Supply 4, no. 2 (April 1, 2004): 35–38. http://dx.doi.org/10.2166/ws.2004.0025.
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A methodology has been developed to apply the materials budget concept, used in sediment and nutrient studies, to construct a pathogen budget for drinking water catchments, taking into consideration pathogen origin, deposition, inactivation and movement within a catchment. These processes can be described in terms of stocks (pathogens) and flows (movement of stocks). In south-eastern Australia, the majority of pathogen loading to major tributaries was predicted to occur during and after high intensity rainfall events where in-stream resuspension was not of great relative importance. In contrast, during dry weather the transit time within the studied catchment was sufficiently long that in-stream processes became relatively important. Total pathogen unit (TPU) budgets were constructed for the parasitic protozoa Cryptosporidium and Giardia. This approach enables water utility managers to identify those catchment segments and processes that are contributing or removing the greatest load of pathogens, and thus where management options will be most effective. With improved knowledge of pathogen ecology this approach can be further refined to provide budgets of infectious pathogen units (IPU), more directed to public health risk endpoints.
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Kronvang, B., H. Tornbjerg, C. C. Hoffmann, J. R. Poulsen, and J. Windolf. "Documenting success stories of management of phosphorus emissions at catchment scale: an example from the pilot river Odense, Denmark." Water Science and Technology 74, no. 9 (August 12, 2016): 2097–104. http://dx.doi.org/10.2166/wst.2016.379.
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Documentation of the effects of different mitigation measures adopted at different scales to reduce phosphorus (P) loadings to surface waters is needed to help catchment managers select the best management practices. Water quality monitoring data from the outlets of two paired catchments (the river Odense catchment versus a neighbouring control catchment) on the island of Funen, Denmark, showed significantly different trends in annual flow-weighted P concentrations during the period 2000–2013. A significant downward trend in flow-weighted particulate P (PP) concentrations (0.051 mg P L−1) and loss (0.155 kg P ha−1) was detected for the river Odense catchment, whereas a similar trend did not emerge in the control catchment. The observed differences in PP reductions may be due to wetlands acting as P sinks since wetland restoration activities have been much more comprehensive in the river Odense catchment (1.8 ha wetlands km−2) than in the control catchment (0.5 ha wetland km−2). The excess downward trend in total P and PP in the river Odense catchment (5,600 kg P and 3,700 kg P) is corroborated by extrapolating the results from a mass-balance study and 10 years of in situ measurements of P storage (3,700 kg P and 15,000 kg P).
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Qiao, Jie, Mike Crang, Liangping Hong, and Xiaofeng Li. "Exploring the Benefits of Small Catchments on Rural Spatial Governance in Wuling Mountain Area, China." Sustainability 13, no. 2 (January 14, 2021): 760. http://dx.doi.org/10.3390/su13020760.
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China is facing an important period of rural governance innovation and restructuring of territorial spatial patterns. This paper selects catchments as the most closely related spatial units for rural industrial development and rural settlement activities, profoundly revealing the characteristics of transformational development and spatial governance in mountainous areas. To date, extensive literature in this area has produced a broad multidisciplinary consensus on catchment water and soil conservation and rural industry development; however, the interactive mechanism of ecological, social, and economic networks, and the characteristics behind small catchments which benefit from spatial governance, have never been analyzed and are relatively new to the sphere of rural governance. Our research argues the relative importance of multi-scale catchment units compared with traditional administrative village units in enhancing the organizational benefits of rural revitalization in terms of workforce, resources, and capital, using the case study of a catchment in the Wuling mountainous area. Our study presents a framework to explore the multi-dimensional governance experience of a small catchment in the Wuling mountainous area and proposes to integrate the resource endowment advantages of small catchments into rural industries development and transform the economic and social benefits contained in the ecological environment into multi-scale spatial benefits among farmers, villages, and the regional rural area. However, not all cases provide positive evidence. The overall development of a catchment is confronted with complex constraints, which are mainly related to the development stage and local historical and geographical factors. Furthermore, affected by the top-down “project-system” in the “poverty era”, the logic of “betting on the strong” and the single-centered logic of resource allocation at the grassroots level exacerbated the fragmentation of the mountainous area. Generally speaking, the catchment perspective promotes regional linkage development and multi-center governance modes and triggers multidisciplinary theoretical thinking to some extent. The catchment’s overall development helps play to the comparative advantage of mountainous areas and promotes endogenous sustainable development to a certain degree. However, the promotion of catchment governance in poverty-stricken mountainous areas is faced with a lack of financial foundation and needs support in order to break through the national system and local social constraints.
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Holman, I. P., J. M. Hollis, M. E. Bramley, and T. R. E. Thompson. "The contribution of soil structural degradation to catchment flooding: a preliminary investigation of the 2000 floods in England and Wales." Hydrology and Earth System Sciences 7, no. 5 (October 31, 2003): 755–66. http://dx.doi.org/10.5194/hess-7-755-2003.
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Abstract. During the autumn of 2000, England and Wales experienced the wettest conditions for over 270 years, causing significant flooding. The exceptional combination of a wet spring and autumn provided the potential for soil structural degradation. Soils prone to structural degradation under five common lowland cropping systems (autumn-sown crops, late-harvested crops, field vegetables, orchards and sheep fattening and livestock rearing systems) were examined within four catchments that experienced serious flooding. Soil structural degradation of the soil surface, within the topsoil or at the topsoil/subsoil junction, was widespread in all five cropping systems, under a wide range of soil types and in all four catchments. Extrapolation to the catchment scale suggests that soil structural degradation may have occurred on approximately 40% of the Severn, 30–35 % of the Yorkshire Ouse and Uck catchments and 20% of the Bourne catchment. Soil structural conditions were linked via hydrological soil group, soil condition and antecedent rainfall conditions to SCS Curve Numbers to evaluate the volume of enhanced runoff in each catchment. Such a response at the catchment-scale is only likely during years when prolonged wet weather and the timing of cultivation practices lead to widespread soil structural degradation. Nevertheless, an holistic catchment-wide approach to managing the interactions between agricultural land use and hydrology, allowing appropriate runoff (and consequent flooding) to be controlled at source, rather than within the floodplain or the river channel, should be highlighted in catchment flood management plans. Keywords: flooding, soil structure, land management, Curve Number, runoff, agriculture
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Deelstra, J., M. Bechmann, and S. H. Kvaernø. "SOIL and SOIL-NO at catchment scale – a case study for an agriculture-dominated catchment." Water Science and Technology 45, no. 9 (May 1, 2002): 9–17. http://dx.doi.org/10.2166/wst.2002.0193.
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A one-dimensional model, SOIL/SOIL-NO, is used to simulate the water and nitrogen balance at catchment scale. The objective is to use the model in simulating the effects of best management practices on nitrogen runoff. The model was applied to individual farm fields in an agriculture dominated catchment and simulations were carried out for the period from 94–98. The results were promising. The simulated nitrogen runoff agreed quite well with the measured nitrogen loss at the main station. The effects of best management practices like optimal fertiliser application, catch crops and irrigation were simulated. For this particular catchment, the introduction of catch crops resulted in the best effect on reducing nitrogen runoff from agricultural dominated catchments.
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Ekundayo, Ariwadun Martha. "The Role of Hydrologic Processes in Catchments." Volume 5 - 2020, Issue 8 - August 5, no. 8 (September 8, 2020): 1216–25. http://dx.doi.org/10.38124/ijisrt20aug571.
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Hydrological processes within a catchment perform an important role in the functioning of the ecosystem, by incorporating the complex processes (physical, chemical and biological) that sustain life. Water is a very vital factor that determines the efficiency of the ecosystem, species composition and biodiversity, hence the imperativeness of a review of the catchment hydrological processes causing runoff. Some of the models, such as the Stochastic and the Physical and Probability Distribution Models, will be reviewed. The factors affecting these hydrological processes, determining their functioning within the catchment will be reviewed to examine their effects on the productivity of the basin. For proper catchment management, this review is important for examining integration and understanding the important challenges of the interaction between economic, environmental, and productivity values of catchments as complex socioecological systems. Catchments have common hydrological characteristics but vary in their runoff response within the basin which is subject to the dominant hydrological factor controlling the catchment
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Fang, Haiyan. "Using WaTEM/SEDEM to Configure Catchment Soil Conservation Measures for the Black Soil Region, Northeastern China." Sustainability 13, no. 18 (September 18, 2021): 10421. http://dx.doi.org/10.3390/su131810421.
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In recent years, to combat soil erosion, large-scale soil conservation measures have been implemented in the world. Evaluation of the integrated catchment management is urgently required. In the present study, soil erosion and sediment yield under 24 scenarios were predicted, based on the water and tillage erosion model and sediment delivery deposition model (WaTEM/SEDEM). The current catchment management was not ideal, with a catchment soil loss rate (SLR) of 599.88 t km−2 yr−1 and a sediment yield of 240.00 t km−2 yr−1. The catchment management with contour tillage on <3° slopes, hedgerow planting on 3–5° slopes, terracing on 5–8° slopes, and forestation on >8° slopes with trenches along the forest and dams in gullies was the best catchment management to control soil loss, with catchment SLR that was less than the tolerable value of 200 t km−2 yr−1. However, the SLR on the <3° slopes was still higher than the tolerable value. It is not enough to control soil loss by only implementing contour tillage measure on <3° slopes, and other measures should be further implemented on these slopes. In gullies, more measures should be implemented to prevent sediment flowing out of the catchments, in Northeastern China.
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Davis, J. Richard, Trevor F. N. Farley, William J. Young, and Susan M. Cuddy. "The experience of using a decision support system for nutrient management in Australia." Water Science and Technology 37, no. 3 (February 1, 1998): 209–16. http://dx.doi.org/10.2166/wst.1998.0209.
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Australia experienced an outbreak of algal blooms in the early 1990s that led to a concerted national program to reduce eutrophication. Most Australian States drew up nutrient management strategies which required catchment management groups to produce plans for nutrient reduction within their catchments. Most catchment management groups used the Catchment Management Support System (CMSS) to assist them in the preparation of these plans. CMSS is a simple decision support system developed by CSIRO (the national research organisation) which allows managers to assess the effects of Land Use and Land Management policies on nutrient loads. CMSS has been widely adopted by managers and community groups throughout eastern Australia and has been instrumental in drawing up many nutrient management plans. The program's success is attributed to its design features such as its simplicity of use, very low data demand, suitability for the specific institution task and the degree of documentation, training and support offered. In this paper the application of CMSS to the Hawkesbury-Nepean Catchment in New South Wales is used to illustrate features of the decision support system, and its relevance to policy formulation.
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Yu, Mengran, Thomas Bishop, and Floris Van Ogtrop. "Assessment of the Decadal Impact of Wildfire on Water Quality in Forested Catchments." Water 11, no. 3 (March 14, 2019): 533. http://dx.doi.org/10.3390/w11030533.
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Wildfire can have significant impacts on hydrological processes in forested catchments, and a key area of concern is the impact upon water quality, particularly in catchments that supply drinking water. Wildfire effects runoff, erosion, and increases the influx of other pollutants into catchment waterways. Research suggests that suspended sediment and nutrient levels increase following wildfire. However, past studies on catchment water quality change have generally focused on the short term (1–3 years) effects of wildfire. For appropriate catchment management, it is important to know the long-term effect of wildfire on catchment water quality and the recovery process. In this study, a statistical analysis was performed to examine the effect of 2001/2002 Sydney wildfire on catchment water quality. This research is particularly important, since the catchments studied provide drinking water to Sydney. Linear mixed models were used in this study in an analysis of covariance (ANCOVA)-type change detection approach to assess the effect of wildfire. We used both burnt and unburnt catchments to aid the interpretation of the results and to help disentangle the effects of natural climate variation, as well as of the wildfire. The results of this study showed persistent long-term (10-year) effects of wildfire, including increases in total suspended sediment concentrations (64% higher than in unburnt catchments), total nitrogen concentrations (48% higher), and total phosphorus (40% higher).
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Latron, J., and N. Lana-Renault. "The relevance of hydrological research in small catchments – A perspective from long-term monitoring sites in Europe." Cuadernos de Investigación Geográfica 44, no. 2 (June 29, 2018): 387. http://dx.doi.org/10.18172/cig.3499.
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The usefulness of small (< 10 km2) catchments has been repeatedly recognized during the recent history of hydrological research. This foreword to the special issue of Cuadernos de Investigación Geográfica – Geographical Research Letters devoted to long term hydrological research in small catchment in Europe highlights the main reasons for promoting the small catchment approach and revises its growing use, starting with the first catchment studies in Switzerland for management purposes, and followed by the development of more interdisciplinary research programs that used small catchments as field laboratories, long-term observatories, sites for method and model validation, and places for training young researchers. The volume includes nine contributions concerning studies carried out in long term monitoring sites in several European countries and aims at showing the relevance of the small catchment approach in hydrological research in Europe.
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Adams, R., P. F. Quinn, and M. J. Bowes. "Modelling and monitoring nutrient pollution at the large catchment scale: the implications of sampling regimes on model performance." Hydrology and Earth System Sciences Discussions 10, no. 8 (August 8, 2013): 10161–207. http://dx.doi.org/10.5194/hessd-10-10161-2013.
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Abstract. Daily and sub daily nutrient data are now becoming available to support nutrient research and which will help underpin policy making. It is vital that water quality models that utilize these high-frequency data sets are both appropriate and suitably accurate. Here we address the capability of process based models applied at larger catchment scales (size 100–500 km2) and show what phenomena can be simulated by exploiting high frequency data for larger catchments. Hence we can suggest the dominant processes that underpin the fluxes observed in larger catchment and thus what can be simulated, and to what accuracy. Thus the implications of new sampling frequency and model structure can be addressed and the implication to catchment management is discussed. Here we show a case study using the Frome catchment (414 km2), Dorset UK, which demonstrates: 1. The use of process based model of nutrient flow and nutrient flux (TOPCAT) for use in larger catchments. 2. Simulations of high frequency data at weekly and sub daily time steps, thus reflecting the simulations' strengths and weaknesses. 3. Cumulative distributions of observed and simulated fluxes – as an effective means of communicating the catchment dynamics in larger catchments.
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Adams, Russell, Paul Quinn, Nick Barber, and Sim Reaney. "The Role of Attenuation and Land Management in Small Catchments to Remove Sediment and Phosphorus: A Modelling Study of Mitigation Options and Impacts." Water 10, no. 9 (September 12, 2018): 1227. http://dx.doi.org/10.3390/w10091227.
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It is well known that soil, hillslopes, and watercourses in small catchments possess a degree of natural attenuation that affects both the shape of the outlet hydrograph and the transport of nutrients and sediments. The widespread adoption of Natural Based Solutions (NBS) practices in the headwaters of these catchments is expected to add additional attenuation primarily through increasing the amount of new storage available to accommodate flood flows. The actual type of NBS features used to add storage could include swales, ditches, and small ponds (acting as sediment traps). Here, recent data collected from monitored features (from the Demonstration Test Catchments project in the Newby Beck catchment (Eden) in northwest England) were used to provide first estimates of the percentages of the suspended sediment (SS) and total phosphorus (TP) loads that could be trapped by additional features. The Catchment Runoff Attenuation Flux Tool (CRAFT) was then used to model this catchment (Newby Beck) to investigate whether adding additional attenuation, along with the ability to trap and retain SS (and attached P), will have any effect on the flood peak and associated peak concentrations of SS and TP. The modelling tested the hypothesis that increasing the amount of new storage (thus adding attenuation capacity) in the catchment will have a beneficial effect. The model results implied that a small decrease of the order of 5–10% in the peak concentrations of SS and TP was observable after adding 2000 m3 to 8000 m3 of additional storage to the catchment.
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Fu, Guangtao, Guangheng Ni, and Chi Zhang. "Recent Advances in Adaptive Catchment Management and Reservoir Operation." Water 11, no. 3 (February 27, 2019): 427. http://dx.doi.org/10.3390/w11030427.
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This editorial introduces the latest research advances in the special issue on catchment management and reservoir operations. River catchments and reservoirs play a central role in water security, community wellbeing and social-economic prosperity, but their operators and managers are under increasing pressures to meet the challenges from population growth, economic activities and changing climates in many parts of the world. This challenge is tackled from various aspects in the 27 papers included in this special issue. A synthesis of these papers is provided, focusing on four themes: reservoir dynamics and impacts, optimal reservoir operation, climate change impacts, and integrated modelling and management. The contributions are discussed in the broader context of the field and future research directions are identified to achieve sustainable and resilient catchment management.
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Dawes, W. R., M. Gilfedder, M. Stauffacher, J. Coram, S. Hajkowicz, G. R. Walker, and M. Young. "Assessing the viability of recharge reduction fordryland salinity control: Wanilla, Eyre Peninsula." Soil Research 40, no. 8 (2002): 1407. http://dx.doi.org/10.1071/sr01044.
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The emerging paradigm to manage the spread of dryland salinity is the manipulation of farming practice to provide both a reduction in recharge and a commercial return to farm enterprises. Recent work has attempted to classify the groundwater systems across Australia into distinct provinces, with the implication that the flow processes, and therefore remediation strategies, of catchments within each province are similar. This paper presents a case study of the Wanilla catchment on the Eyre Peninsula in South Australia. This catchment is in the groundwater province that includes 60% of the dryland salinity expression in Australia. The results of conceptual and numerical modelling of the catchment suggest that the land management for reduced recharge paradigm may be less effective in this groundwater province than in others. The scale of expression and salinity history of such catchments provides further impediments to management options aimed at controlling or reversing existing dryland salinity.
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Nazaripouya, Hadi, Mehdi Sepehri, Abbas Atapourfard, Bagher Ghermezcheshme, Celso Augusto Guimarães Santos, Mehdi Khoshbakht, Sarita Gajbhiye Meshram, et al. "Evaluating Sediment Yield Response to Watershed Management Practices (WMP) by Employing the Concept of Sediment Connectivity." Sustainability 15, no. 3 (January 27, 2023): 2346. http://dx.doi.org/10.3390/su15032346.
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Watershed management practices (WMP) are widely used in catchments as a measure to reduce soil erosion and sediment-related problems. We used a paired catchment in the Gonbad region of Hamadan province, Iran, to evaluate sediment yield response to watershed management practices (WMP) by employing the concept of sediment connectivity (SC). To do this, the SC index as a representation of sediment yield was firstly simulated for the control catchment that there is no WMP. In the next step, the SC index was simulated for impacted catchment, including some WMP, i.e., seeding, pit-seeding, and exclosure. After assessing the accuracy of the produced SC maps using filed observations and erosion plots, the SC maps using quantile-quantile plot (Q-Q plot) were compared to achieve the role of WMP in reducing the rate of sediment yield. The Q-Q plot showed that there is a strong similarity between the SC of catchments, it can be concluded that the WMP has no significant impact on the reducing rate of the sediment yield in this study.
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Gragne, A. S., S. Uhlenbrook, Y. Mohammed, and S. Kebede. "Catchment modeling and model transferability in upper Blue Nile Basin, Lake Tana, Ethiopia." Hydrology and Earth System Sciences Discussions 5, no. 2 (March 20, 2008): 811–42. http://dx.doi.org/10.5194/hessd-5-811-2008.
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Abstract. Understanding spatial and temporal distribution of water resources has an important role for water resource management. To understand water balance dynamics and runoff generation mechanisms at the Gilgel Abay catchment (a major tributary into lake Tana, source of Blue Nile, Ethiopia) and to evaluate model transferability, catchment modeling was conducted using the conceptual hydrological model HBV. The catchment of the Gigel Abay was sub-divided into two gauged sub-catchments (Upper Gilgel Abay, UGASC, and Koga, KSC) and one ungauged sub-catchment. Manual calibration of the daily models for three different catchment representations (CRs): (i) lumped, (ii) lumped with multiple vegetation zones, and (iii) semi-distributed with vegetations zone and elevation zones, showed good to satisfactory model performance (Nash-Sutcliffe efficiency values, Reff>0.75 and >0.6, respectively, for UGASC and KSC). The change of the time step to fifteen and thirty days resulted in very good model performances in both sub-catchments (Reff>0.8). The model parameter transferability tests conducted on the daily models showed poor performance in both sub-catchments, whereas the fifteen and thirty days models yielded high Reff values using transferred parameter sets. This together with the sensitivity analysis carried out after Monte Carlo simulations (1 000 000 model runs) per CR explained the reason behind the difference in hydrologic behaviors of the two sub-catchments UGASC and KSC. The dissimilarity in response pattern of the sub-catchments was caused by the presence of dambos in KSC and differences in the topography between UGASC and KSC. Hence, transferring model parameters from the view of describing hydrological process was found to be not feasible for all models. On the other hand, from a water resources management perspective the results obtained by transferring parameters of the larger time step model were acceptable.
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Versfeld, D. B. "Participatory catchment management — an opportunity for Southern Africa." Water Science and Technology 32, no. 5-6 (September 1, 1995): 145–51. http://dx.doi.org/10.2166/wst.1995.0585.
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South Africa has hundreds of thousands of hectares of heavily populated and badly degraded landscapes. Past attempts at land management have been either through avoidance or the top-down imposition of “betterment” schemes. Participatory methods offer a new opportunity for communities living within these catchments to share their knowledge and to become involved in planning and implementing the management process. This paper discusses the use of Participatory Rural Appraisal (PRA) in a catchment rehabilitation programme in rural KwaZulu/Natal, the lessons learnt and the prospects for wider application.
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Górski, Jarosław, Katarzyna Górska, Łukasz Bąk, and Aleksandra Sałata. "Catchment management influence on the magnitude of the total solids load conveyed by the stormwater sewer system – a comparative case study." E3S Web of Conferences 86 (2019): 00022. http://dx.doi.org/10.1051/e3sconf/20198600022.
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The aim of the investigations was to make a comparative analysis of TSS concentration and variability in TSS loads as well as to analyse first flush phenomena. That issue is related to the characteristics of two urban catchments located in the city of Kielce. The runoff events observed in the period of investigations (years 2009 – 2016) showed a great diversity. The analyses performed for the study revealed substantial differences in the values of TSS concentration and loads in stormwater from the catchments of concern. The highest TSS concentration in the stormwater for the catchment located at the city outskirts was 252 mg.dm-3, whereas for the catchment in the city centre that value was almost 30 – fold higher and amounted to 7432 mg.dm-3. The analysis of the runoff first flush with respect to the mass of total solids in individual rainfall events showed substantial differences in the course of the process depending on the type of catchment management. In the densely built-up area, the initial 25% and 30% of the volume of runoff transported 25-41% and 30-48% of the solids mass, respectively. In the other catchment, with low and sparsely located buildings, the maximum values of TSS mass were considerably higher and amounted to 22-83% and 28-87%.
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Fisher, Ruth, Ari Shammay, Juan Pablo Alvarez–Gaitan, and Richard M. Stuetz. "Sewer catchment effects on wastewater and biosolids odour management." Water Science and Technology 77, no. 9 (April 11, 2018): 2348–54. http://dx.doi.org/10.2166/wst.2018.166.
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Abstract The composition of wastewater in sewer catchments is known to affect the performance of wastewater treatment plants (WWTPs). However, there is limited knowledge as to how catchment characteristics, such as types of catchment industries, impact odour emissions from downstream sludge processing and biosolids management. Odorous emissions from biosolids processing at WWTPs can represent a significant community impact when the local population is exposed to odours. The main odorants emitted from biosolids are volatile sulfur compounds (VSCs), however, volatile organic compounds (VOCs) in emissions may also be perceptable after the removal of VSCs in odour abatement systems. Types of compounds present in emissions throughout biosolids processing at five WWTPs of varying sizes and levels of treatment (primary only and primary and secondary) were analysed. The ratio of total VSCs to VOCs in emissions, and the sensorial importance of each class varied between the sites. As a number of the VOCs in emissions were of industrial origin, this variation is likely dependent on industrial flows into the upstream sewer catchment. The impact of different emission compositions on both activated carbon and biologically based odour abatement systems were discussed.
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Crossman, J., M. N. Futter, P. G. Whitehead, E. Stainsby, H. M. Baulch, L. Jin, S. K. Oni, R. L. Wilby, and P. J. Dillon. "Flow pathways and nutrient transport mechanisms drive hydrochemical sensitivity to climate change across catchments with different geology and topography." Hydrology and Earth System Sciences Discussions 11, no. 7 (July 15, 2014): 8067–123. http://dx.doi.org/10.5194/hessd-11-8067-2014.
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Abstract. Hydrological processes determine the transport of nutrients and passage of diffuse pollution. Consequently, catchments are likely to exhibit individual hydrochemical responses (sensitivities) to climate change, which is expected to alter the timing and amount of runoff, and to impact in-stream water quality. In developing robust catchment management strategies and quantifying plausible future hydrochemical conditions it is therefore equally important to consider the potential for spatial variability in, and causal factors of, catchment sensitivity, as to explore future changes in climatic pressures. This study seeks to identify those factors which influence hydrochemical sensitivity to climate change. A perturbed physics ensemble (PPE), derived from a series of Global Climate Model (GCM) variants with specific climate sensitivities was used to project future climate change and uncertainty. Using the Integrated Catchment Model of Phosphorus Dynamics (INCA-P), we quantified potential hydrochemical responses in four neighbouring catchments (with similar land use but varying topographic and geological characteristics) in southern Ontario, Canada. Responses were assessed by comparing a 30 year baseline (1968–1997) to two future periods: 2020–2049 and 2060–2089. Although projected climate change and uncertainties were similar across these catchments, hydrochemical responses (sensitivity) were highly varied. Sensitivity was governed by soil type (influencing flow pathways) and nutrient transport mechanisms. Clay-rich catchments were most sensitive, with total phosphorus (TP) being rapidly transported to rivers via overland flow. In these catchments large annual reductions in TP loads were projected. Sensitivity in the other two catchments, dominated by sandy-loams, was lower due to a larger proportion of soil matrix flow, longer soil water residence times and seasonal variability in soil-P saturation. Here smaller changes in TP loads, predominantly increases, were projected. These results suggest that the clay content of soils could be a good indicator of the sensitivity of catchments to climatic input, and reinforces calls for catchment-specific management plans.
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Campbell, J. M., P. Jordan, and J. Arnscheidt. "Using high-resolution phosphorus data to investigate mitigation measures in headwater river catchments." Hydrology and Earth System Sciences 19, no. 1 (January 26, 2015): 453–64. http://dx.doi.org/10.5194/hess-19-453-2015.
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Abstract. This study reports the use of high-resolution water quality monitoring to assess the influence of changes in land use management on total phosphorus (TP) transfers in two 5 km2 agricultural sub-catchments. Specifically, the work investigates the issue of agricultural soil P management and subsequent diffuse transfers at high river flows over a 5-year timescale. The work also investigates the phenomenon of low flow P pollution from septic tank systems (STSs) and mitigation efforts – a key concern for catchment management. Results showed an inconsistent response to soil P management over 5 years with one catchment showing a convergence to optimum P concentrations and the other an overall increase. Both catchments indicated an overall increase in P concentration in defined high flow ranges. Low flow P concentration showed little change or higher P concentrations in defined low flow ranges despite replacement of defective systems and this is possibly due to a number of confounding reasons including increased housing densities due to new-builds. The work indicates fractured responses to catchment management advice and mitigation and that the short to medium term may be an insufficient time to expect the full implementation of policies (here defined as convergence to optimum soil P concentration and mitigation of STSs) and also to gauge their effectiveness.
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Szeląg, Bartosz, Agnieszka Cienciała, Szymon Sobura, Jan Studziński, and Juan T. García. "Urbanization and Management of the Catchment Retention in the Aspect of Operation of Storm Overflow: A Probabilistic Approach." Sustainability 11, no. 13 (July 3, 2019): 3651. http://dx.doi.org/10.3390/su11133651.
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This paper presents the concepts of a probabilistic model for storm overflow discharges, in which arbitrary dynamics of the catchment urbanization were included in the assumed period covered by calculations. This model is composed of three components. The first constitutes the classification model for the forecast of storm overflow discharges, in which its operation was related to rainfall characteristics, catchment retention, as well as the degree of imperviousness. The second component is a synthetic precipitation generator, serving for the simulation of long-term observation series. The third component of the model includes the functions of dynamic changes in the methods of the catchment development. It allows for the simulation of changes in the extent of imperviousness of the catchment in the long-term perspective. This is an important advantage of the model, because it gives the possibility of forecasting (dynamic control) of catchment retention, accounting for the quantitative criteria and their potential changes in the long-term perspective in relation to the number of storm overflows. Analyses carried out in the research revealed that the empirical coefficients included in the logit model have a physical interpretation, which makes it possible to apply the obtained model to other catchments. The paper also shows the use of the prepared probabilistic model for rational catchment management, with respect to the forecasted number of storm overflow discharges in the long-term and short-term perspective. The model given in the work can be also applied to the design and monitoring of catchment retention in such a way that in the progressive climatic changes and urbanization of the catchment, the number of storm overflow discharges remains within the established range.
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Coxon, Gemma, Nans Addor, John P. Bloomfield, Jim Freer, Matt Fry, Jamie Hannaford, Nicholas J. K. Howden, et al. "CAMELS-GB: hydrometeorological time series and landscape attributes for 671 catchments in Great Britain." Earth System Science Data 12, no. 4 (October 12, 2020): 2459–83. http://dx.doi.org/10.5194/essd-12-2459-2020.
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Abstract. We present the first large-sample catchment hydrology dataset for Great Britain, CAMELS-GB (Catchment Attributes and MEteorology for Large-sample Studies). CAMELS-GB collates river flows, catchment attributes and catchment boundaries from the UK National River Flow Archive together with a suite of new meteorological time series and catchment attributes. These data are provided for 671 catchments that cover a wide range of climatic, hydrological, landscape, and human management characteristics across Great Britain. Daily time series covering 1970–2015 (a period including several hydrological extreme events) are provided for a range of hydro-meteorological variables including rainfall, potential evapotranspiration, temperature, radiation, humidity, and river flow. A comprehensive set of catchment attributes is quantified including topography, climate, hydrology, land cover, soils, and hydrogeology. Importantly, we also derive human management attributes (including attributes summarising abstractions, returns, and reservoir capacity in each catchment), as well as attributes describing the quality of the flow data including the first set of discharge uncertainty estimates (provided at multiple flow quantiles) for Great Britain. CAMELS-GB (Coxon et al., 2020; available at https://doi.org/10.5285/8344e4f3-d2ea-44f5-8afa-86d2987543a9) is intended for the community as a publicly available, easily accessible dataset to use in a wide range of environmental and modelling analyses.
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Pandi, Dinagarapandi, Saravanan Kothandaraman, and Mohan Kuppusamy. "Simulation of Water Balance Components Using SWAT Model at Sub Catchment Level." Sustainability 15, no. 2 (January 12, 2023): 1438. http://dx.doi.org/10.3390/su15021438.
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Simulation of Water Balance Components (WBCs) is import for sustainable water resources development and management. The Soil Water and Assessment Tool (SWAT) is a semi-distributed hydrological model to estimate the WBCs by forcing the hydrological response unit (HRU) and meteorological variables. The developed model simulates five WBCs viz. surface runoff, lateral flow, percolation, actual evapotranspiration and soil water at sub catchment level. To demonstrate the model compatibility a case study taken over Chittar catchment, Tamilnadu, India. The catchment was divided in to 11 sub catchments. The ten year interval LULC (i.e., 2001 and 2011), twenty year daily meteorological data (i.e., 2001–2020) and time invariant soil and slope data were used in developing the water balance model. Developed model was calibrated and evaluated with river gauge monthly discharging using SUFI-2 algorithm in SWAT-CUP. The model calibration performed in two stage i.e., pre-calibration (2001–2003) and post-calibration (2004–2010). The model performance was evaluated with unseen river gauge discharging data (i.e., 2011–2015). Then, results of statistical outputs for the model were coefficient of determination (R2) is 0.75 in pre-calibration, 0.94 in post-calibration and 0.81 in validation. Further strengthen the model confidential level the sub catchments level monthly actual evapotranspiration were compared with gridded global data GLEAM v3.6a. Finally, the developed model was simulate the five WBCs whereas, surface runoff, lateral flow, percolation, actual evapotranspiration and soil water at sub catchment level during 2001–2020. The sub catchment level WBCs trend helps to make fast and accurate decision. At all 11 sub catchments a long drought was observed during 2016–2018 due to failure of northeast monsoon. The WBCs were directly reinforced by their north east monsoon which gives the major portion of rainfall i.e., September to December. Hence all the WBCs were directly correlated with rainfall with or without time lag. By understanding the sub catchment level of monthly WBCs over the Chittar catchment is useful for land and water resource management.
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Prudhomme, Christel, Eric Sauquet, and Glenn Watts. "Low Flow Response Surfaces for Drought Decision Support: A Case Study from the UK." Journal of Extreme Events 02, no. 02 (December 2015): 1550005. http://dx.doi.org/10.1142/s2345737615500050.
Full textAbstract:
Droughts are complex natural hazards, and planning future management is complicated by the difficulty of projecting future drought and low flow conditions. This paper demonstrates the use of a response surface approach to explore the hydrological behavior of catchments under a range of possible future conditions. Choosing appropriate hydrological metrics ensures that the response surfaces are relevant to decision-making. Examples from two contrasting English catchments show how low flows in different catchments respond to changes in rainfall and temperature. In an upland western catchment, the Mint, low flows respond most to rainfall and temperature changes in summer, but in the groundwater dominated catchment of the Thet, changes in spring rainfall have the biggest impact on summer flows. Response surfaces are useful for understanding long-term changes, such as those projected in climate projections, but they may also prove useful in drought event management, where possible future conditions can be plotted onto the surface to understand the range of conditions the manager faces. Developing effective response surfaces requires considerable involvement and learning from catchment decision-makers at an early stage, and this should be considered in any planned application.
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Brandt, C., M. Robinson, and J. W. Finch. "Anatomy of a catchment: the relation of physical attributes of the Plynlimon catchments to variations in hydrology and water status." Hydrology and Earth System Sciences 8, no. 3 (June 30, 2004): 345–54. http://dx.doi.org/10.5194/hess-8-345-2004.
Full textAbstract:
Abstract. The Plynlimon headwater catchments in mid-Wales have been a landmark study of water resources in the UK uplands for over 30 years. The main physical features of the catchments have been digitised as the basis for linking new model developments and process understanding. Examples are given of how the main physical attributes are related to land management, hydrology and water quality. These data are also being used to provide insights into catchment processes that may underpin the development of new research. This work is particularly relevant given the need for the assessment of water status under the Water Framework Directive. The paper presents hypothetical management scenarios for the catchments, to show how ecological status may be improved, for example, by selectively restructuring areas of commercial forest. Keywords: Plynlimon, GIS, catchment study, forestry, hydrology, WFD
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Van Loon, A. F., and H. A. J. Van Lanen. "A process-based typology of hydrological drought." Hydrology and Earth System Sciences 16, no. 7 (July 6, 2012): 1915–46. http://dx.doi.org/10.5194/hess-16-1915-2012.
Full textAbstract:
Abstract. Hydrological drought events have very different causes and effects. Classifying these events into distinct types can be useful for both science and management. We propose a hydrological drought typology that is based on governing drought propagation processes derived from catchment-scale drought analysis. In this typology six hydrological drought types are distinguished, i.e. (i) classical rainfall deficit drought, (ii) rain-to-snow-season drought, (iii) wet-to-dry-season drought, (iv) cold snow season drought, (v) warm snow season drought, and (vi) composite drought. The processes underlying these drought types are the result of the interplay of temperature and precipitation at catchment scale in different seasons. As a test case, about 125 groundwater droughts and 210 discharge droughts in five contrasting headwater catchments in Europe have been classified. The most common drought type in all catchments was the classical rainfall deficit drought (almost 50% of all events), but in the selected catchments these were mostly minor events. If only the five most severe drought events of each catchment are considered, a shift towards more rain-to-snow-season droughts, warm snow season droughts, and composite droughts was found. The occurrence of hydrological drought types is determined by climate and catchment characteristics. The drought typology is transferable to other catchments, including outside Europe, because it is generic and based upon processes that occur around the world. A general framework is proposed to identify drought type occurrence in relation to climate and catchment characteristics.