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Showing 1 to 20 of 25 for “"Occoquan Reservoir"”.
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Contextualization and Sodium Diet Implications of Occoquan Reservoir Salinization
… the potability of finished drinking water. The Occoquan Reservoir, located in Northern Virginia, is a freshwater system that is facing rising salinization. Stakeholders for the reservoir have been convened to address these rising salinization concerns. Among these stakeholders, there are a …
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Effects of sediment on water quality in the Occoquan Reservoir
… was to determine the effect of sediments in the Occoquan Reservoir on the water quality. Phosphate determination by the ascorbic acid method was first evaluated for its precision and accuracy. An assay was developed to measure the rate of nutrient phosphate release to the overlying water in a …
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Occoquan Reservoir and Watershed: A Water Quality Assessment 1973–2019
The Occoquan Reservoir is part of the largest indirect potable reuse systems in the United States. It in an important water supply source for the Northern Virginia area, as well as, an ecological and recreational area. Furthermore, the Occoquan Reservoir protects the water quality of the Chesapeake …
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Trihalomethane-precursor production by Hydrilla verticillata in the Occoquan Reservoir
… should this plant become established in the Occoquan Reservoir. It was found that the Occoquan Reservoir could support hydrilla. Three sources of THM-precursors were found to result from hydrilla. These included: 1) extracellular products (ECP) from hydrilla itself; 2) ECP from periphyton …
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An analysis of phytoplankton variations in the Occoquan Reservoir, 1970-1988
The phytoplankton data from Occoquan Reservoir surface samples collected during 1970-1988 were entered into a database. The data were analyzed to determine the relationships between changes in phytoplankton succession patterns and the various physical and chemical water-quality variables. The …
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A Water Quality Assessment of the Occoquan Reservoir and its Tributary Watershed: 1973-2002
The Occoquan Reservoir is a public water supply in northern Virginia. The Occoquan Watershed has developed over the years from rural land uses to metropolitan suburbs within easy commuting distance from Washington, DC. Due to this urbanization, the Occoquan Reservoir is especially vulnerable to …
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A Microcosm-Based Investigation into Oxidized Nitrogen Removal in the Hypolimnetic Waters of the Occoquan Reservoir of Northern Virginia
… use in water quality management studies of the Occoquan Reservoir. In order for the model to achieve its best possible predictive capability, additional quantitative information on denitrification rates in the reservoir was required. A microcosm operating protocol was developed to obtain such …
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Low Flow Variations in Source Water Supply for the Occoquan Reservoir System Based on a 100-Year Climate Forecast
… use/demand change into a hydrologic model of the Occoquan watershed, which encompasses an area of approximately 1,550 square kilometers in Northern Virginia, U.S.A., and is part of the drinking water supply to approximately 1.7 million residents.
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An Investigation into the Effects of an External Electron Acceptor on Nutrient Cycling at the Sediment-Water Interface of the Occoquan Reservoir
Water supply reservoirs are often subject to accelerated nutrient enrichment from urban sources. Cultural eutrophication due to such enrichment requires the development of efficient management and remediation strategies to protect drinking water sources. This study investigates the effects of using …
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Ionic Characterization of Laundry Detergents: Implications for Consumer Choice and Inland Freshwater Salinization
… large. Such risks are clearly on display in the Occoquan Reservoir – a drinking water source for roughly one million people in the northern Virginia/ National Capital Region. Sodium concentrations in the Occoquan Reservoir are approaching levels that can affect taste and health. The Reservoir is …
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An Examination Of Water Quality Impacts On Lake Manassas
… via the Broad Run, a tributary of the Occoquan Reservoir. The Occoquan Reservoir supplies potable water to over 750,000 people in the Northern Virginia area. This thesis presents the results of a limnological analysis of Lake Manassas. The techniques used are established limnological …
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Microbiological influences on phosphorus release from aerobic lake sediments
… in regulating nutrient availability in lakes and reservoirs has been the subject of many recent studies. Classical theories concerning the regulation of phosphorus release from sediments by oxidation-reduction potential neglect the potential of microorganisms to transfer large amounts of …
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A Tidal Prism analysis of the soluble copper mixing zone around the Occoquan Water Treatment Plant
… applies copper sulfate as an algaecide in the Occoquan Reservoir to control the growth of taste and odor causing algae. The Occoquan Water Treatment Plant removes water from the reservoir for distribution to portions of Fairfax County. Approximately once a day, the treatment plant backwashes …
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A limnological investigation of Lake Manassas, Virginia
… discharges, via the stream Broad Run, to the Occoquan Reservoir. The Occoquan Reservoir supplies potable water to over 750,000 people in the Northern Virginia area. As the population of Washington, D.C., continues to increase, the development of the surrounding suburbs changes the quality of …
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Integrated Model-Based Impact Assessment of Climate Change and Land Use Change on the Occoquan Watershed
… variations in the streamflow characteristics of Occoquan watershed and water quality in the Occoquan reservoir. The combination of these two driving forces has created four themes and an integrated complexly-linked watershed-reservoir model was used to run the simulations. Two emission scenarios …
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The effect of salinity on nutrient release from riverine and tributary estuarine sediments to the Chesapeake Bay under oxidizing and reducing conditions
… microcosm studies of York River sediments and Occoquan Reservoir sediments were conducted. Seawater and freshwater were mixed in various ratios to simulate seasonal, salinity-varying environments in the Chesapeake Bay and its tributary estuaries. Experiments were conducted under aerobic, …
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Development of a Guide to Lake and Reservoir Zone Determination
Reservoirs are generally created by damming rivers. The upper reaches of any reservoir is generally narrow and winding like the parent river. This is the riverine zone of the reservoir. The reservoir is deepest and widest near the dam. Here, lake-like conditions exist and the water is quiescent. …
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A Complex, Linked Watershed-Reservoir Hydrology and Water Quality Model Application for the Occoquan Watershed, Virginia
The Occoquan Watershed is a 1515 square kilometer basin located in northern Virginia and contains two principal waterbodies: the Occoquan Reservoir and Lake Manassas. Both waterbodies are principal drinking water supplies for local residents and experience eutrophication and summer algae growth. …
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Unveiling Causal Links, Temporal Patterns, and System-Level Dynamics of Freshwater Salinization Using Transit Time Distribution Theory
… the complex interplay between FSS and IPR in the Occoquan Reservoir, an important drinking-water source in the Mid-Atlantic United States, within its diverse environmental, social and political contexts. Using extensive data collected over 25 years, this research quantifies contributions of …
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Trace Metals in Fish From a Reservoir Receiving Runoff From a Developing Watershed
… mercury and zinc in bass and carp taken from the Occoquan Reservoir in Virginia with three purposes in mind. First, to determine whether the amounts of metals present represent any hazard to humans when the fish are used as food. Second, to assess the degree of change in the concentrations over …
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