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Showing 1 to 16 of 16 for “"Occoquan Watershed"”.
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Upstream Population Gradient Drives Freshwater Salinization in the Occoquan Watershed
… the percep- tion of potable drinking water. The Occoquan watershed, located in Northern Virginia has experienced rapid urbanization across recent decades and is now confronted with rising salinization. Various stakeholders in the area have focused efforts to quantify the drivers of salinization …
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Pesticide distribution in water, sediment, and fish of the Occoquan Watershed
… been identified as possible contaminants in the Occoquan Watershed. Since 1982, water, sediment, and fish samples have been collected from the streams and reservoirs of the watershed 2-4 times per year. The Occoquan Watershed Monitoring Laboratory (OWML) collected samples and analyzed for a …
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Algal nutrients: sources and patterns of flow in the Occoquan Watershed
… 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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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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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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An Investigation of the Limnological Dynamics of Lake Manassas
Lake Manassas, located in the Occoquan Watershed in Virginia is a man-made impoundment of the Broad Run river. This lake surface area is approximately 697 acres, and it drains approximately 46,500 acres. Currently, the reservoir supplies drinking water to the City of Manassas and some areas of …
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Impact of Indirect Potable Reuse on Endocrine Disrupting Compounds in the Potomac River Basin
… 2000s, and has led to a series of studies in the watershed to determine the sources and magnitude of endocrine disruption. Endocrine disrupting compounds (EDCs) are exogenous chemicals that interfere with the endocrine system and can cause detrimental health effects at low concentrations. This …
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Development of a Guide to Lake and Reservoir Zone Determination
… developed was applied to Lake Manassas and the Occoquan Reservoir located in the Occoquan watershed in Virginia. Both are man-made impoundments. Analysis of data, based on the method developed, was successfully in dividing both reservoirs into the three zones. This method may therefore be …
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Mapping and Modeling Chlorophyll-a Concentrations in the Lake Manassas Reservoir Using Landsat Thematic Mapper Satellite Imagery
Carried out in collaboration with the Occoquan Water Monitoring Lab, this thesis presents the results of research that sought to ascertain the spatial distribution of chlorophyll-a concentrations in the Lake Manassas Reservoir using a combination of Landsat TM satellite imagery and ground based …
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A comparison of the pollutant removal efficiencies of retention and detention stormwater control basins
… data that had been previously collected by the Occoquan Watershed Monitoring Laboratory under the National Urban Runoff Program, to obtain an understanding of the degree of treatment of stormwater runoff obtainable in retention (maintains a water pool) and detention (drains completely) basins. …
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A framework for Improving Hydrologic and Water Quality Prediction in Urbanized Watersheds through Stakeholder Co-Design and Multi-Model Integration
Urban watersheds present a unique modeling challenge due to the complex interplay between natural and hydrologic processes, engineered infrastructure, and the diverse decision-making by multiple stakeholder groups. These interactions span multiple spatial and temporal scales, making it difficult …
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Low Flow Variations in Source Water Supply for the Occoquan Reservoir System Based on a 100-Year Climate Forecast
… has an impact on runoff characteristics within a watershed. By incorporating changes in land use/demand into hydrologic model simulations, a more complete picture can be generated of the possible runoff characteristics, and thereby source water supply. The four land use scenarios used in this …
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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 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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A Coupled Hydrologic-Economic Modeling Framework for Evaluating Alternative Options for Reducing Watershed Impacts in Response to Future Development Patterns
Economic input-output (I-O) and watershed models provide useful results but when seeking to integrate these systems, the structural, spatial, and temporal differences between these models must be carefully considered. To reconcile these differences, a hydrologic-economic modeling framework is …
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An Environmental Decision Support System to Facilitate Stakeholder Interaction with Water Quality Models
… In recent times, emphasis has been placed on watershed-based solutions to remediate the problems of diffuse source pollution and to engage stakeholders in designing solutions. Water quality models are an integral part of this process; such models are often inaccessible to lay stakeholders. A …