Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"pollutant loads"”.
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Predictability and trends of annual pollutant loads in Midwestern watersheds
… and refining the science of predicting pollutant (nutrient and sediment) export from large scale watersheds. To enable these goals, this research is centered on large watersheds in Midwestern United States, which have been some of the primary sources of nutrient and sediment export to …
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QuickLET : a web-based tool for estimating pollutant loads in a watershed
Web-based modeling tools for estimating pollutant loads in watersheds are few in literature. Those that are available for public access often require domain expertise, making them relevant mostly among environmental researchers. Aside from intensive efforts required to gather enormous amount of …
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Locally derived nonpoint loading estimates for the Boeuf River/Bayou Lafourche watershed
… that can be used to quantify nonpoint source pollutant loads from different land-use types. The Louisiana Department of Environmental Quality (LDEQ) is in the process of implementing management programs for impacted water bodies based on the Total Maximum Daily Load (TMDL) of a pollutant. …
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Analysis of the Watershed Resources Registry using GIS to evaluate stormwater restoration practices in the Christina River Watershed
… Resources Registry ranks and pre-treated pollutant loads and then a spatial resolution threshold was defined for the Watershed Resources Registry’s site selection. This study used a completed Water Quality Improvement Plan for the Christina River Watershed that provided 26 proposed best …
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Testing the use of the BASINS PLOAD model to simulate the quality of stormwater runoff from the Kuils River catchment, Cape Town
… in urban catchments is closely linked. As pollutants accumulate on land surfaces they are carried in runoff. This has led to increasing concerns that stormwater is responsible for adversely affecting the quality of freshwater resources. Total phosphorus and total suspended solids represent …
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A comparison of the pollutant removal efficiencies of retention and detention stormwater control basins
… ponds achieve substantial reduction in the pollutant loads carried by stormwater runoff from residential areas. Non-soluble settleable materials were removed to a comparable degree by both basin types. However, the pool of water characteristic of a retention basin offered a superior …
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Performance Evaluation of a Low Impact Development Retrofit for Urban Stormwater Treatment
… located in Northern Virginia was examined for pollutant removal and hydrologic performance. The treatment train included four in-line grass swales followed by a bioretention cell with a gravel base. The facility retained 85% of the rainfall. Influent and effluent pollutant loads were calculated …
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Agricultural and forest land runoff in upper South River near Waynesboro, Virginia
… flows, land runoff was the primary source of all pollutants. On the long term basis, however, wastewater effluents were the major contributors of all parameters except total suspended solids. Industrial effluents contributed the greatest proportion of chemical oxygen demand and total nitrogen. The …
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Understanding the role of scale in assessing sediment and nutrient loads from Coastal Plain watersheds delivered to the Chesapeake Bay
… on prediction of nutrient and sediment runoff loads from Coastal Plain watersheds. The overall goals of my dissertation are to assess the effect of urban and agricultural watershed on coastal waters through monitoring and modeling, and to characterize treatment performance of SCMs. These goals …
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New applications of STEPL watershed modeling of CAFO feedlot runoff and implications of surface water impacts
… using the Spreadsheet Tool for Estimating Pollutants Load (STEPL). STEPL estimates the annual nutrient load of nitrogen and phosphorus, among other pollutants, by land use for a watershed. The Dry Creek Watershed Basin of Sioux County, Iowa, is delineated to capture runoff from large CAFO …
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Assessing environmental equivalents for water quality trading
… source (PS) dischargers who need to reduce their pollutant loads with land managers who could offset those loads with nonpoint source (NPS) reductions to economically achieve water quality improvements in a watershed. The potential issues impeding WQT are its inability to address trading risks and …
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The Impact of Rochester Storm Sewers on the Water Quality of the Lower Genesee River: A Modeling Approach Using PCSWMM
… Model-predicted flows, total phosphorus (TP) loads, and total suspended solid (TSS) loads to the Genesee River for 2012 were 19,197,116 m3, 2,277 kg P, and 625,694 kg, respectively. More than 50% of the total flow and 27% of the TP load discharged to the Genesee River from the storm sewer …
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An investigation of the pollution contribution of catchments surrounding the Knysna Estuary, with implications for stormwater management
… and municipal databases were used to assess the pollutant contribution of catchment runoff. High nutrient concentrations were conducive to eutrophic or hypertrophic conditions at most sites. Total Inorganic Nitrogen (TIN) concentrations exceeded 5 mg/ℓ at 60% of the sites. Ammonium concentrations …
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Improvement of simulating BMPs and LID practices in L-THIA-LID model
… the greatest reduction in runoff volume and pollutant loads among all scenarios. However, this scenario was not as cost-efficient as most other scenarios. The L-THIA-LID 2.1 model is a valid tool that can be applied to various locations to help identify cost effective BMP/LID practice plans …
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Assessing the Nonpoint Source Pollutant Removal Efficiencies of a Two-Basin Stormwater Management System in an Urbanizing Watershed
… assess its efficacy in reducing nonpoint source pollutant losses downstream. The facility design includes both an upper water quality (wet) pond and a lower 100-yr-event quantity (dry) pond. These on-stream ponds capture both baseflow and storm runoff from the southern portion of the Virginia …
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Investigation of Low Impact Development Practices For Coastal South Carolina: Oak Terrace Preserve
… ability to retain stormwater and its associated pollutants regionally.</p> <p>Interviews of stormwater professionals indicated that the educational needs of stakeholders (27 % of responses) and the regulatory process (22 % of responses) are the primary obstacles to regional implementation of LID …
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Hydrological And Sedimentological (Dis)Connectivity In An Urban Suds System Based On High Resolution, Multi-Event Monitoring
… of the ponds, potentially creating a “sink” for pollutants. Sedimentation within this pond was also complex with high rates of accumulation at points close to drain inflows suggesting that there was insufficient energy most of the time to suspend and redistribute the sediment across the bed of …
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Physiological responses of soybean seeds (Glycine Max L. Merr.) to metal pollutants
… This study examines the effect of two metal pollutants, namely Cd and Ni, on the development and functioning of soybean seeds. Cadmium was chosen because it is considered to be the most serious of the metal pollutants, is highly toxic to mammals and easily enters the food chain. Nickel, is …
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A framework for Improving Hydrologic and Water Quality Prediction in Urbanized Watersheds through Stakeholder Co-Design and Multi-Model Integration
… The differences in simulated streamflow, pollutant loads (e.g., nitrogen, phosphorus), and sediment loads were quantified across the three models and three future scenarios. Despite using the same forcing, the three models produced different magnitudes of change in streamflow, sediments …