By C. C. Warnick
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Example text
Then, utilizing the records of average annual precipitation input to the basins at measured streams nearby or having similar hydrologic characteristics, a runoff coefficient is estimated for the drainage basin being studied. This value can be rather subjective in determination and thus represents a place for making a considerable error. Much care should be exercised in esti~natingthe annual runoff coefficient. The product of this coefficient and the computed normal annual precipitation input to the basin and the basin area can be used to calculate the average annual discharge using the formula o= average annual discharge, ft3/sec K = annual runoff coefficient as a decunal value F = weighted average annual precipitation, in.
Is sometimes used in computer processing The annual average runoff term, lnstead of the average annual discharge, 0. is expressed in cubic feet per seconddays [(ft3/sec)(day)]. This is the summation of the mean daily discharges for all the Jays of the year. This saves making an extra calculation that involves the constant Lermof 365 days. With the average annual discharge estimate it is possible t o enter the paranetric flow duration curve and determine values of flow for different exceedance )ercentages for which the parametric flow duration curve has been developed.
Army Corps of Engineers, Hydrologic Engineering Methods for Water Resources Development, Vol. 9: Reservoir Systems Analysis and Conservation. S. Army Corps of Engineers, 1977. S. Army Corps of Engineers, Nationol Hydropower Study. Ft. S. Army Corps of Engineers, 1980. S. Water Resources Council, "Guidelines for Determining Flood Frequency," Bulletin No. 17A. Hydrology Committee. S. Water Resources Council, 1977. Veihmeyer, F. " In Handbook o f Applied Hydrology. V. T. Chow, ed. New York: McGraw-Hill Book Company, 1964.