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Curve Numbers, Recent Developments

Author(s): A. T. Hjelmfelt

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Keywords: Rainfall-runoff; Hydrologic losses; Infiltration; Surface water hydrology

Abstract: A joint work group was formed by the US Department of Agriculture to review the Curve Number procedure in terms of current field measurements. As a result of this work group much of the National Engineering Handbook (USDA, 1993) has been rewritten to improve consistency and clarity. A fuzzy set theory approach was used to establish a physical basis for classifying soils into Hydrologic Soil Groups. An asymptotic method was developed for determining Curve Numbers from rainfall-runoff data and for determining quality of fit of data to the Curve Number runoff equation.


Year: 2001

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