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Showing 1 to 20 of 53 for “"TMDL"”.
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Development of a Risk Assessment Model to Assess TMDL Implementation Strategies
… and develop a Total Maximum Daily Load (TMDL) plan for each. Although past research indicates that the risk of illness to humans varies by source of fecal contamination, current watershed assessments are developed according to total concentration of indicator bacteria, with all sources …
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Comparison Watershed Selection When Applying the AllForX Approach for Sediment TMDL Development
… comparison watersheds to develop sediment TMDL target loads. The Generalized Watershed Loading Function (GWLF) model was used to simulate sediment loads for 20 watersheds (four impaired and 16 comparison) in the Upper James and New River basins in Virginia's Ridge and Valley physiographic …
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Improving microbial fate and transport modeling to support TMDL development in an urban watershed
… employed to facilitate Total Maximum Daily Load (TMDL) restoration efforts. Due to limited understanding of microbial fate and transport, predictions of FIB concentrations are associated with considerable uncertainty relative to other water-quality contaminants. By focusing on a data-rich …
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Monitoring of Selected Bacteriological Parameters Associated with the Sinking Creek Total Maximum Daily Load (TMDL).
… was added to the state 303 (d) list and a TMDL for fecal coliforms developed. The study objectives were to 1) identify areas in Sinking Creek with elevated levels of fecal coliforms and 2) compare data collected to results from watershed models used in the TMDL. Fourteen sites on Sinking …
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Factors Influencing the Amount of Time Spent By Cattle In Streams: Implications for TMDL Development
… computer models when total maximum daily load (TMDL) plans are being developed. This input parameter is estimated using professionals' best judgment because experimental data are not available, and estimations are generally inconsistent. The goal of this study was to gain a better estimate of …
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Potential and Quantification of Street Sweeping Pollutant Reductions towards addressing TMDL WLAs for MS4 Compliance
… (WLAs) and meet total maximum daily loads (TMDLs). Street sweeping is potentially an effective BMP since streets exist throughout urban watersheds, often are directly connected to the storm sewer, and are found to contain an abundance of contaminants. Although pollutant removal from street …
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Examining the Influence of Wildlife Population and Fecal Coliform Density Variability on Virginia Bacterial TMDL Development
… water quality impairment in Virginia. Bacteria TMDLs (Total Maximum Daily Loads) for watersheds are typically created using a modeling approach. These models require characterization of all residential, agricultural, and wildlife sources of bacteria. Wildlife bacteria source characterization is …
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Improving total Maximum Daily Load Implementation and Utilization Using Adaptive Management Strategies
… Strategy for Total Maximum Daily Load (TMDL) Implementation. This research provided a basic look at finding possible strategies that may help the TMDL program work more efficiently. The purpose was to create a framework that improves the existing TMDL framework. This involved addressing …
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Comparing Two Methods for Developing Local Sediment TMDLs to Address Benthic Impairments
… the Clean Water Act, a total maximum daily load (TMDL) must be developed for impaired waters. When developing a TMDL for aquatic life use impairment where sediment has been identified as the primary pollutant, the target sediment load is often determined using a non-impaired reference watershed, …
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Multipurpose Approaches to Regional Goals: Chapters in Environmental and Development Economics
… their Chesapeake Bay Total Maximum Daily Load (TMDL) obligations. To address declining Chesapeake Bay water quality, the United States Environmental Protection Agency (EPA) set extensive nutrient and sediment reduction goals under the 2010 Chesapeake Bay TMDL. Virginia has responded by passing …
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Estimating Uncertainty in HSPF based Water Quality Model: Application of Monte-Carlo Based Techniques
… in water quality modeling as related to TMDL development, four Monte Carlo (MC) based techniques—single-phase MC, two-phase MC, Generalized Likelihood Uncertainty Estimation (GLUE), and Markov Chain Monte Carlo (MCMC) —were applied to a Hydrological Simulation Program–FORTRAN (HSPF) model …
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Evaluating the Effects of Watershed Land Use Distribution and BMP Data on HSPF Water Quality Predictions
… the Chesapeake Bay Total Maximum Daily Load (TMDL) goals for sediment, TN and TP. Site-specific data are derived from the local watershed inventory while disaggregated data are based on county-level aggregated data that are distributed to portions of river segments that intersect each county. …
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CLIMATE CHANGE IMPACTS ON THE SOIL EROSION AND NUTRIENT LOSSES IN THE GREAT LAKES REGION
… the enforcement of total maximum daily loads (TMDL). Climate change may impact NPS pollutant transportation processes through influencing runoff
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Locally derived nonpoint loading estimates for the Boeuf River/Bayou Lafourche watershed
… bodies based on the Total Maximum Daily Load (TMDL) of a pollutant. Pollutants of concern include total suspended solids (TSS), nitrogen, and phosphorus. One of the key parameters in determining the TMDL of a water body is the nonpoint source pollutant load from different land-use types. To …
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Evaluation of the Development and Effectiveness of Copper Total Maximum Daily Loads (Tmdls) to Achieve Marine Water Quality Criteria
… agencies establish Total Maximum Daily Loads (TMDLs) to reduce concentrations of toxic chemicals from entering waterways. A TMDL determines the maximum amount of pollutant loading a water body can sustain and still achieve water quality standards; they are developed to ensure that surface water …
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Municipal wastewater treatment plants' nitrogen removal response to financial incentives in Maryland and Virginia
… the EPA developed a Total Maximum Daily Load (TMDL) for the entire watershed that established nutrient reduction targets to achieve Bay water quality objectives. The TMDL required states in the Chesapeake Bay watershed to create implementation plans to meet nutrient reductions. Maryland and …
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Sector-Targeting for Controlling Nutrient Loadings: A Case Study of the North Fork of the Shenandoah River Watershed
The main purpose of Total Maximum Daily Loads (TMDL) is to achieve a water quality standard. The economic costs of reducing nutrient loadings are often not taken into account during development. In this study, sector targeting is used to minimize the total cost of nutrient reduction by targeting …
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Comparing Alternative Methods of Simulating Bacteria Concentrations with HSPF Under Low-Flow Conditions
… When developing a Total Maximum Daily Load (TMDL) to address a bacterial impairment in an upland, rural watershed, direct deposit (DD) fecal bacteria sources (livestock and wildlife defecating directly in the stream) often drive the source-load reductions required to meet water quality …
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Assessing Efforts To Reduce Sediment Impacts In Cottonwood Creek, Blackfoot Basin, Montana
… the culverts. The third objective critiqued the TMDL/Water Quality Improvement Plan for the Middle Blackfoot/Nevada Creek basins. While the TMDL involved considerable detail on sediment sources, quantities, and proposed reductions in loads, the implementation and monitoring features were weak. …
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