Empirical Investigation of Curve Number Technique

by Allen T. Hjelmfelt, Jr., (M.ASCE), Hydraulic Engr.; U.S. Dept. of Agriculture, Science and Education Administration, Agricultural Research, Watershed Research Unit, Columbia, Mo.,

Serial Information: Journal of the Hydraulics Division, 1980, Vol. 106, Issue 9, Pg. 1471-1476

Document Type: Journal Paper


The curve number runoff equation of the U.S. Department of Agriculture, Soil Conservation Service, is treated as a transformation from rainfall distribution to runoff frequency distribution. Reasonable agreement between observed and hypothesized result was obtained on four of the five watersheds shown. The hypothesis failed for the watershed tested in the arid southwest.

Subject Headings: Runoff curve number | Empirical equations | Watersheds | Frequency distribution | Soil treatment | Rainfall frequency | Rainfall-runoff relationships | Agricultural wastes

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