United States Department of Transportation
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Local Design Storm: Volume 3. User's Manual
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1983-05-01
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[PDF-2.77 MB]
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Abstract:Recently developed improved methods for highway storm water drainage require information on the temporal distribution of rainfall (i.e., hyetograph) in addition to the average rain intensity. The triangular design hyetograph method is developed as a practical method to provide the local storm hyetograph for design of small highway drainage facilities. The method is based on the methods of moments, using and preserving the statistical mean of the first time moment of rainstorms. The method is proposed as a trade-off between theoretical sophistication and practical simplicity. A total of 293,946 rainstorms from the hourly precipitation data of 222 National Weather Service stations and 5 to 60 minute data of 13 raingage stations of USDA Agricultural Research Service were analysed to provide the statistical values of the hyetograph parameters for the United States. In this Volume, a user's guide of the procedure to establish the local design hyetograph is presented. In addition, user's guides and listings of two computer programs to perform statistical analysis of rainfall moments for triangular hyetographs and for frequency analysis of rainfall depth-duration-return period relation are also presented.
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