An Improved I a S Relation Incorporating Antecedent Moisture in SCS-CN Methodology

S. Mishra (), R. Sahu, T. Eldho and M. Jain

Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), 2006, vol. 20, issue 5, 643-660

Abstract: Employing a large dataset of 84 small watersheds (area=0.17 to 71.99 ha) of U.S.A., this paper investigates a number of initial abstraction (I a )-potential maximum retention (S) relations incorporating antecedent moisture (M) as a function of antecedent precipitation (P 5 ), and finally suggests an improved relation for use in the popular Soil Conservation Service Curve Number (SCS-CN) methodology for determination of direct runoff from given rainfall. The improved performance of the incorporated M=α $$sqrt{P_5S}$$ and I a =λ S 2 /(S + M) relations, where λ is the initial abstraction coefficient, in the SCS-CN methodology exhibits the dependence of I a on M, which is close to reality; the larger the M, the lesser will be I a , and vice versa. Such incorporation obviates sudden jumps in the curve number variation with antecedent moisture condition, an unreasonable and undesirable feature of the existing SCS-CN model. Copyright Springer Science+Business Media, Inc. 2006

Keywords: antecedent moisture; curve number; initial abstraction; NEH-4; soil conservation service (search for similar items in EconPapers)
Date: 2006
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Citations: View citations in EconPapers (13)

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DOI: 10.1007/s11269-005-9000-4

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