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Last modified
1/26/2010 10:10:38 AM
Creation date
10/5/2006 4:39:46 AM
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Floodplain Documents
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Title
A Uniform Technique for Determining Flood Flow Frequencies
Date
12/1/1967
Prepared By
Water Resources Council - Hydrology Committee
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br />9 <br /> <br />Take K from Table 1 or Table 2 for the computed value <br />of g and the selected recurrence interval or percent chance. <br />Log Q is the logarithm of a flood discharge having the same <br />recurrence interval or percent chance. <br /> <br />6. Find the antilog of log Q to get the flood discharge Q._U <br /> <br />I~ <br />" <br />, <br /> <br />Tables of K Values <br /> <br />Tables 1 and 2 were made from larger and more complete <br />tables prepared by H. Leon Harter (Mathematical Statistician, <br />Wright-Patterson Air Force Base) and the U.S. Soil <br />Conservation Service. Copies of those tables are available, <br />free of charge, from the Central Technical Unit, Soil <br />Conservation Service, 269 Federal Center Building, <br />Hyattsville, Md. 20782. <br /> <br />Computer Program Sources <br /> <br />Federal agencies such as the Bureau of Reclamation, Corps <br />of Engineers, Geological Survey, Soil Conservation Service, <br />Tennessee Valley Authority, and others, have prepared <br />computer programs for the log-Pearson Type III method. <br />These programs are in various computer languages and for <br />various types of computers. Inquiries regarding these pro- <br />grams should be addressed to those agencies. <br /> <br />References <br /> <br />I' <br /> <br />1,', <br /> <br />(1) "Theoretical Frequency Curves," by H. A. Foster: American <br />Society of Civil Engineers, Transactions, v. 87, p. 142-203: 1924. <br /> <br />(2) "Methods of Flow Frequency Analysis," by the Subcommittee <br />on Hydrology, Inter-Agency Committee on Water Resources: <br />Notes on Hydrologic Activities, Bulletin 13, April 1966. For <br />sale by the Superintendent of Documents, Government Printing <br />Office, Washington, D. C. 20402. Price 3S cents. <br /> <br />1/ <br /> <br />The frequency line can be shown by plotting each Q versus its <br />respective percent chance on lognormal probability paper and <br />drawing a continuous line through the plotted points. <br /> <br />- <br />
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