Publication Date |
1977 |
Personal Author |
Fletcher, J. E.; Huber, A. L.; Haws, F. W.; Clyde, C. G. |
Page Count |
374 |
Abstract |
Frequency analyses of more than 1,000 small watersheds in the United States and Puerto Rico were used to develop the estimation method for design of peak flow for ungaged watersheds. This method, called the Federal Highway Administration (FHWA) method, is conceptually similar to the Bureau of Public Roads (BRP) method developed by W. D. Potter. The FHWA method relates the runoff peak to easily determined hydrophysiographic parameters and is intended for use on watersheds smaller than 50 square miles. The concept of risk is incorporated into the design procedure. The risk is the probability that one or more events will exceed a specified peak flow within the usable lifetime of the drainage structure. The return period of the design flood peak can then be modified according to the risk the designer is willing to take. Another concept dealing with the probable maximum runoff peak derived as a function of watershed area is included. |
Keywords |
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Source Agency |
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NTIS Subject Category |
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Corporate Authors |
Utah Water Research Lab., Logan.; Federal Highway Administration, Washington, DC. |
Supplemental Notes |
See also Volume 1, PB-286 202. |
Document Type |
Technical Report |
Title Note |
Final rept. |
NTIS Issue Number |
197826 |
Contract Number |
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