Relative Runoff by Curve Number Nomograph

by Richard J. Heggen, (A.M.ASCE), Asst. Prof.; Dept. of Civ. Engrg., The Univ. of New Mexico, Albuquerque, N.M. 97131,

Serial Information: Journal of the Irrigation and Drainage Division, 1981, Vol. 107, Issue 4, Pg. 385-388

Document Type: Journal Paper


In many drainage analyses, the Soil Conservation Service (SCS) curve number (CN) runoff volume estimate may serve as initial basis for design of engineering structures. While there are often a variety of runoff-estimation techniques available having a sounder basis in theory than the CN procedure, these methods are more often appropriate for subsequent, data-intensive studies. Relative increase in runoff is a paramount technical issue in urbanizing areas where land use changes are only allowed if increased runoff can be retained. It is suggested that while more theoretical or statistical methods should generally be used to estimate the time-dependent magnitude of discharge, CN analysis may be used to explore the relative dependency of this magnitude on watershed condition.

Subject Headings: Soil analysis | Drainage | Runoff curve number | Hydraulic design | Structural design | Structural analysis | Land use | Statistics | South Carolina | United States

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