Time Base of a Hydrographby Nazeer Ahmed, Univ of Louisville, Louisville, KY, USA,
Abstract: For design projects in water resources, a hydrograph is commonly used to determine the required flood volumes. The time base of a hydrograph is a crucial parameter in such studies, and its speedy and accurate determination is essential for both economic and hydrologic reasons. Based on the actual measurements of a large number of hydrographs, a technique is presented whereby the length of the time base can be computed expeditiously. The only variable required for this computation is the drainage area easily available from published sources. The technique developed is applicable for drainage areas from 1 mi**2 (or 1 km**2) to 2000 mi**2 (or 2500 km**2), and larger.
Subject Headings: Hydrographs | Water resources | Drainage | Hydraulic design | Floods | Parameters (statistics) | Economic factors | Hydrologic models
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