Objective Determination of Safety Factor in Reservoir Design

by Edward R. Close, Res. Hydro.; U.S. Geological Survey, Washington, DC,
Leo Beard, (F.ASCE), Dir.; The Hydrologic Engrg. Ctr., U.S. Army Corps of Engrs., Davis, CA,
David R. Dawdy, Res. Hydro.; U.S. Geological Survey, Fort Collins, CO,

Serial Information: Journal of the Hydraulics Division, 1970, Vol. 96, Issue 5, Pg. 1167-1177

Document Type: Journal Paper


Objective criteria for determining hydrologic safety factor for reservoir design are developed for streamflow sample sizes of 10 yr, 25 yr, 50 yr and 100 yr. For the smaller sample sizes, the index of allowable shortages, for which average net benefits are maximum, is also smaller. This reduction in the index of allowable shortages results in an increase in the average reservoir size needed to offset the effects of sampling error. Thus, by varying the index of allowable shortages on the basis of hydrologic record length, safety factors may be determined.

Subject Headings: High-rise buildings | Safety | Reservoirs | Hydrology | Hydraulic design | Streamflow

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