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Unit Hydrograph Relationships for Small Urban Texas Watersheds

by Steven C. Veal, Carter & Burgess Inc, United States,



Document Type: Proceeding Paper

Part of: Soil Properties Evaluation from Centrifugal Models and Field Performance

Abstract:

Snyder's unit hydrograph methods are used in a HEC-1 multiple sub-area routing model where the sub-area sizes average one to two square miles in size. However, the Snyder's tp and CP640 parameters used in these studies are usually determined from Corps of Engineers regionalization studies performed on watersheds with drainage areas generally exceeding ten square miles. In this analysis, the HEC-1 unit hydrograph and loss rate optimization routines are used to determine Snyder's parameters for 12 urban Dallas/Fort Worth watersheds varying in size from .38 square miles to 8.05 square miles. A regional regression analysis was performed to relate the optimized Snyder's parameters to easily defined watershed characteristics.

Subject Headings: Watersheds | Regression analysis | Hydrographs | Municipal water | Urban areas | Parameters (statistics) | Flood routing | Texas | United States

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