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Evaluation of sediment yields due to urban development

Evaluation of sediment yields due to urban development

Virginia Polytechnic Institute and State University Water Resources Research Center Bulletin (98): 1-28

Sediment yields in the Cedar Hill area, Virginia Beach, Virginia, USA, were determined. Using a modified Universal Soil Loss Equation, soil erosion rates were estimated at construction, semi-construction and well-developed sites in this area. Sediment yields then were measured at the 3 sites and at a downstream monitoring station and compared with the estimates. Dilution factors were studied as a function of rainfall intensities, and apparently correlated with the characteristics of the area undergoing construction. The dilution factor was defined as the ratio of suspended-sediment concentration on the site compared to that for an off-site specific downstream station at the peak hours of runoff hydrographs. The dilution factor increased as rainfall intensity decreased, and on-site soil erosion rates varied according to the stage of construction.

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