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An improved I-a-S relation incorporating antecedent moisture in SCS-CN methodology

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Title An improved I-a-S relation incorporating antecedent moisture in SCS-CN methodology
 
Creator MISHRA, SK
SAHU, RK
ELDHO, TI
JAIN, MK
 
Subject rainfall-runoff models
antecedent moisture
curve number
initial abstraction
neh-4
soil conservation service
 
Description 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 = alpha root P5S and I-a = lambda S-2/(S + M) relations, where lambda 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.
 
Publisher SPRINGER
 
Date 2011-08-29T09:23:47Z
2011-12-26T12:58:31Z
2011-12-27T05:48:37Z
2011-08-29T09:23:47Z
2011-12-26T12:58:31Z
2011-12-27T05:48:37Z
2006
 
Type Article
 
Identifier WATER RESOURCES MANAGEMENT, 20(5), 643-660
0920-4741
http://dx.doi.org/10.1007/s11269-005-9000-4
http://dspace.library.iitb.ac.in/xmlui/handle/10054/12041
http://hdl.handle.net/10054/12041
 
Language en