Flood Peak Program for Urbanizing Semi-Arid Areas

by Darde G. de Roulhac, ASCE, USA,

Document Type: Proceeding Paper

Part of: Hydraulics and Hydrology in the Small Computer Age


This paper describes a microcomputer program for flood peak determination based on a highly modified version of the Rational method developed by M. E. Zeller, which employs the Soil Conservation Service (SCS) methodology for obtaining runoff coefficients. The time of concentration varies as an inverse power function with the runoff supply rate through the kinematic wave relationship, and also depends on the hydraulic roughness of the watershed. SCS curve numbers, with arid-zone adjustments, intensity as a function of time of concentration, and other intermediate parameters are calculated by the program without the need for user input of intermediate values. The only inputs needed are the basic precipitations at the site and the watershed parameters.

Subject Headings: Floods | Urban areas | Arid lands | Kinematic waves | Hydraulic roughness | Watersheds | Parameters (statistics) | Runoff | South Carolina | United States

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