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Showing 1 to 20 of 21 for “"nutrient loadings"”.
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Nutrient Loadings Into Conesus Lake
A nutrient loading study utilizing field measurements has not been performed on Conesus Lake tributaries since the construction of a perimeter sewer. The database from this study includes many parameters and is quite large. This report details the results of measurements for stream nutrient …
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Procedure to Quantify Environmental Risk of Nutrient Loadings to Surface Waters
… a procedure to quantify environmental risk of nutrient loadings to surface waters and to demonstrate the procedure on a watershed. A procedure to quantify environmental risk of nutrient loadings to surface waters was developed. The risk is identified as the probability of occurrence of a …
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Sector-Targeting for Controlling Nutrient Loadings: A Case Study of the North Fork of the Shenandoah River Watershed
… 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 sectors with lower costs per unit of pollution reduction. This study focuses …
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Costs of Meeting Water Quality Goals under Climate Change in Urbanizing Watersheds: The Case of Difficult Run, Virginia
… identified as a non-point source contributor of nutrient loadings into watersheds. Interannual surges of nutrient loadings into local water systems are more damaging than mean interannual nutrient loadings. Virginia has outlined the need to reduce urban nutrient loadings. Mean interannual …
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Predicting water quality effects on bay anchovy (Anchoa mitchilli) growth and production in Chesapeake Bay: linking water quality and individual-based fish models
… decreased since the 1950s due to an increase in nutrient loadings. Increased nutrient loads have caused an increase in the extent and duration of hypoxic conditions. Restoration via large-scale reductions in nutrient loadings is now underway. How reducing nutrient loadings will affect water …
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Nutrient load analysis of Lago de Yojoa, Honduras
… a controversial subject. This thesis describes a nutrient load analysis performed to gain a better understanding of the water quality. Loads were calculated for point sources, non-point sources, and other sources. These loads were applied to a trophic model to determine the lake's trophic status. …
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Simulation and Optimization of a Constructed Wetland for Biomass Production and Nitrate Removal
Recently there is growing concern about high nutrient loadings in surface waters as a result of intensive agriculture, resulting in hypoxia in costal ecosystems. There is simultaneous growing interest in the cultivation of perennial grasses for bio-ethanol production. Constructed wetlands offer a …
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Characterizing water quality, nutrients, and dissolved oxygen dynamics in four Lake Ontario coastal wetlands
… ecosystems, yet their role in regulating nutrient loadings to receiving waters remains unclear. Over a decade of monitoring by the Toronto and Region Conservation Authority revealed that four wetlands (Rouge Marsh, Duffin’s Marsh, Carruthers Marsh, and Frenchman’s Bay) vary as net sinks or …
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Vehicular Ammonia Emissions in Baltimore, Maryland
… as the Chesapeake Bay, contributing to excess nutrient loadings that cause eutrophication. Vehicle exhaust contains ammonia, created by a reaction of NOx with H2 in the three-way catalytic converter. Ammonia emissions were measured using a mass balance on the Fort McHenry Tunnel, Baltimore, …
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The Use of Selected Water Quality Parameters to Identify Fecal Coliform Sources in Support of the Sinking Creek Total Maximum Daily Load.
… region) exhibited the highest average nitrate-N loadings (627.34 mg/sec) and orthophosphate (as PO<sub>4</sub><sup>3-</sup>) loadings (84.83 mg/sec). Alkalinity loadings ranged from 10.00 mg as CaCO<sub>3</sub>/sec to 163,500.00 mgCaCO<sub>3</sub>/sec. Hardness loadings ranged from 2.00 mg as …
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A case study of investment in agricultural sustainability: adoption and policy issues for nitrogen pollution control in the Chesapeake Bay drainage
Nutrient loadings to the Chesapeake Bay are a source of concern for water quality agencies. In particular, excess nitrogen loadings from agricultural production activities threaten water quality in the Bay. Questions have been raised about how effectively traditional BMPs can control nitrogen loss …
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An Investigation of the Limnological Dynamics of Lake Manassas
… conclusion reached in previous reports. The main nutrient source is Broad Run, but there are other smaller sources as well that are of concern. South Run has decreased nutrient loadings since the last report in 1996. Another conclusion is that the lake is Phosphorus-limited, but at times, the lake …
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Quantifying groundwater discharge using thermal imagery and conventional groundwater exploration techniques for estimating the nitrogen loading to a meso-scale inland estuary
… of a study to evaluate groundwater inflow and nutrient loadings to the Great Bay Estuary, New Hampshire. The evaluation of inflow was accomplished independently by two methods: one, used thermal imagery, and the other, piezometric mapping. The thermal imagery method assessed groundwater that …
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Water and Nutrient Use Evaluation of South Dakota Vegetated Treatment Systems
… system's ability to utilize applied water and nutrients. This study was conducted to determine whether existing VTS technology in South Dakota is effective at preventing release of water and nutrients from animal feeding operations.<br /> Vegetated treatment systems at South Dakota feedlots …
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An analysis of nature-based treatment processes for cleaning contaminated surface water runoff from an informal settlement: a case study of the Stiebeuel River catchment, Franschhoek, South Africa
… from informal settlements, despite its high nutrient loadings. This study analyses the extent to which biofilters can be used to clean and reuse contaminated surface water runoff from informal settlements. The objectives are threefold: (i) to analyse the performance of two field-scale …
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AN INVESTIGATION OF AQUATIC MACROPHYTE-BASED AQUATIC WASTEWATER TREATMENT SYSTEMS FOR TEMPERATE CLIMATES (ELODEA NUTTALLII, PHOTOSYNTHESIS, NUTRIENT BUDGET, ACTIVE TRANSPORT, NITRIFICATION)
… as candidates. The hydraulic, organic, and nutrient loadings to the reactors were similar to design values for water hyacinth (Eichornia crassipes) systems. Nitrification occurred on a year round basis. Elodea nuttallii was the best candidate. The plant was productive year round (0.5-4.5 g …
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Improving Predictions of Stormwater Quantity and Quality through the Application of Modeling and Data Analysis Techniques from National to Catchment Scales
… in large increases in runoff, sediment, and nutrient loadings downstream. These changes cause flooding, eutrophication, and harmful algal blooms. Stormwater control measures (SCMs) are used to address these concerns and are designed based on inflow loads. Thus, estimating nutrient and …
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Algal nutrients: sources and patterns of flow in the Occoquan Watershed
The movement of algal nutrients was studied in the Occoquan Watershed. During the period April through September 1973, weekly water samples collected by the Occoquan Monitoring Laboratory were split for chemical analysis and algal growth potential (AGP) assay. Variation in AGP observed between …
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Evaluation of Digital PCR (dPCR) for the Quantification of Soil Nitrogen Turnover Bacteria in Wetland Mesocosms in Response to Season, Fertilization, and Plant Species Richness
Excess nutrients from nonpoint sources are an ongoing problem that is expected to worsen as population and fertilizer usage rise. Conventional centralized treatment systems are not well suited to address nonpoint source pollution. More distributed best management practices (BMPs) like constructed …
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