Design Hydrographs in Coastal Wetland Watersheds

by Timothy J. Doyle, Bishop & Associates, Sarasota, United States,

Document Type: Proceeding Paper

Part of: Engineering Hydrology


The use of synthetic unit-hydrographs for hydraulic design in ungaged watersheds has been an accepted practice for over 50 years. In southeastern U.S. coastal regions, which contain extremely flat topography and many wetland watersheds, considerable uncertainty exists regarding the selection of appropriate unit-hydrograph coefficients. Using a Florida case study, this paper presents a computational method for reducing this uncertainty. By dividing a study basin into several subbasins, and routing hydrographs to the basin outlet, the resulting basin hydrograph is relatively insensitive to variations in selected unit-hydrograph coefficients. Thus, the effect of coefficient selection errors is reduced.

Subject Headings: Basins | Sea water | Wetlands (coastal) | Uncertainty principles | Watersheds | Hydraulic models | Hydraulic design | Case studies | Florida | United States

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