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Showing 1 to 20 of 73 for “"nonpoint-source pollution"”.
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Parameter uncertainty in nonpoint source pollution modeling
… inherently non-deterministic nature of inputs in nonpoint source (NPS) pollution modeling and the lack of information in many cases results in considerable uncertainty in model input parameters, and therefore, model outputs. Uncertainty in input parameters has important implications for model use …
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Applying Probabilistic Risk Assessment to Agricultural Nonpoint Source Pollution
… for the discharge of excessive nitrogen from nonpoint sources (NPSs) to a stream was performed for a small agricultural watershed in northern Virginia. Risk, by definition, is the product of the frequency of occurrence of an event and the consequences of that event. The purpose of this …
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Market and bargaining approaches to nonpoint source pollution abatement problems
… protection, with specific reference to nonpoint source pollution from agricultural land. The case when polluters contribute recursively rather than additively to environmental damages is investigated. While an optimal solution is theoretically possible, there exist opportunities for …
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Control of agricultural nonpoint source pollution in Kranji Catchment, Singapore
… is highly sensitive to nutrient and bacterial pollution, both of which can be directly traced to agricultural runoff. Water quality samples were collected along the main drainage channel in the Neo Tiew subcatchment, which drains to Kranji Reservoir, in an effort to determine the source and …
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Effects of Spatial Information on Estimated Farm Nonpoint Source Pollution Control Costs
… expected that agriculture will be targeted as a source of P reductions. Spatially variable physical and socioeconomic characteristics of a watershed and its occupant farms affect both the decisions made by farmers and the transport of nutrients. Evidence suggests that spatially variable …
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Nonpoint source pollution during dry and wet weather flows in an urbanized watershed
… the quality of urban runoff, from various nonpoint sources during dry weather flows (DWF) and wet weather flows (WWF) in the Las Vegas Valley. Standard constituents in urban runoff were measured to assess the quality of urban runoff, to identify the possible sources of DWF (groundwater …
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Nonpoint source pollution modeling of an agricultural watershed within a geographic information system
… the many strides made in the past two decades, nonpoint source (NPS) pollution continues to be an important environment management and water quality management problem. For the most part, analysis of NPS pollution in watersheds has depended on the use of lumped mathematical models to identify …
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Application of a nonpoint source pollution model to a small watershed in Virginia
AGNPS, a nonpoint source pollution model, was selected to stimulate sediment yield and chemical loadings from Owl Run watershed. The model was validated to demonstrate its applicability to Virginia Piedmont conditions. The validation was carried out by comparing simulation results with measured …
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Modeling phosphorus transport in surface runoff from agricultural watersheds for nonpoint source pollution assessment
Nonpoint source pollution from cropland has been identified as the primary source of nitrogen and sediment, and a significant source of phosphorus in the Chesapeake Bay. These pollutants, whether from point or nonpoint sources, have been found to be the primary cause of declining water quality in …
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The impact of nonpoint source pollution from mining wastes on water quality, Elko County, Nevada
A study was performed at a mine site in Elko County, Nevada to determine the effects on water quality resulting from waste rock at the site. Statistically significant (alpha less than or equal to 0.05) increases of several constituents, including sulfate (272 mg/L), calcium (46 mg/L), and magnesium …
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A Comparative Study of Stream-Gaging Methods Employed in Nonpoint Source Pollution Studies in Small Streams
… has increased with the rising concern about nonpoint source (NPS) pollution. NPS pollution studies, such as TMDL development, often involve quantification of flow in small first and second order streams. This application of technology intended for use in larger streams presents special …
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The Economic Impact of Applying Hypothetical Nonpoint Source Pollution Controls to Hog and Beef Feeding in Illinois
Made available in DSpace on 2014-12-13T19:23:20Z (GMT). No. of bitstreams: 1 7709203.pdf: 8481545 bytes, checksum: d4b398e45ede9e7e579e9b466ee19f8a (MD5) Previous issue date: 1976
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Ecorestoration of riparian forests for nonpoint source pollution control: Policy and ecological considerations in Illinois agroecosystem watersheds
… Central and Northern Illinois has a significant nonpoint source water quality problem that is not being successfully addressed by current agroenvironmental policy. Trend analysis showed that concentrations of nitrate, dissolved phosphorus, and total phosphorus were not reduced in thirteen …
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A Whole-Farm Planning Decision Support System for Preventive Integrated Pest Management and Nonpoint Source Pollution Control
… preventive integrated pest management (IPM) and nonpoint source (NPS) pollution control was designed, implemented and evaluated. The objective of the system was to generate plans at the farm level to satisfy economic and production goals while limiting risks of insect pest outbreaks, nitrate and …
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An Examination of the Stability of Cooperation in an Ongoing Collective Action: The Case of Nonpoint Source Pollution in Lake Pittsfield
This results suggest that without additional incentives, farmers are likely to abandon their voluntary agreement and resume their use of atrazine within the watershed. It is then demonstrated how a combination of policy instruments can be used to alter the underlying game configuration of the …
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Development of a continuous, physically-based distributed parameter, nonpoint source model
ANSWERS, an event-oriented, distributed parameter nonpoint source pollution model for simulating runoff and sediment transport was modified to develop a continuous nonpoint source model to simulate runoff, erosion, transport of dissolved and sediment-bound nutrients, and nutrient transformations. …
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Using Monte Carlo Analysis to Assess Outcome-based Payment for Environmental Services for Denitrifying Bioreactors in the Chesapeake Bay
Conventional nonpoint source pollution policies encourage the adoption of conservation practices to reduce nonpoint source pollutants by paying a portion of the cost to install best management practices. Alternative financial incentive programs, such as payment for environmental services (PES) …
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An assessment of models and methodologies used in the design of detention facilities for small urban watersheds
… of Federal and local agencies to regulate nonpoint source pollution have resulted in an increase in the construction of water quality ponds. Such detention facilities help control nonpoint source pollution by capturing stormwater runoff and detaining the water, which provides time for …
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Surface-subsurface interactive flow simulation using a surface element concept
… urban development. Protecting clean water from pollution is an important goal. One category of water pollution is called ""Nonpoint Source Pollution"" (NPS). This category includes all sources that do not issue from a distinct pipe or outlet. Most of NPS pollution does migrate with surface and …
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