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Future Urbanization Effects on Occoquan Dam PMF

by Norman L. Schickedanz, Harza Engineering Co, Chicago, United States,
Marc I. Schwartz, Harza Engineering Co, Chicago, United States,



Document Type: Proceeding Paper

Part of: Engineering Hydrology

Abstract:

The Fairfax County Water Authority's Occoquan dam, in northern Virginia, are being anchored at a cost of about $2 million. The reason is to increase stability due to an increased PMF estimate and revised stability criteria. Causing the higher PMF were the latest PMP depths applied to future, urbanized basin conditions. PMP has increased since the 1972 estimate. Urbanization had increased from less than 10% then to 30% by 1985 and will continue. By example, this paper presents a way to estimate the effect of urbanization on unitgraphs, a comparison of rural and suburban lag times, the change from the old to new PMP, and the effect of urbanization on the PMF.

Subject Headings: Urban and regional development | Dams | Urban areas | Water resources | Suburbs | Rural areas | Basins | Virginia | United States

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