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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/14958
Title: An improved Ia-S relation incorporating antecedent moisture in SCS-CN methodology
Authors: Mishra S.K.
Sahu R.K.
Eldho T.I.
Jain M.K.
Published in: Water Resources Management
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 (Ia)-potential maximum retention (S) relations incorporating antecedent moisture (M) as a function of antecedent precipitation (P5), 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 √P5S and Ia =λS2/(S + M) relations, where λ is the initial abstraction coefficient, in the SCS-CN methodology exhibits the dependence of Ia on M, which is close to reality; the larger the M, the lesser will be Ia, 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. © Springer Science+Business Media, Inc. 2006.
Citation: Water Resources Management (2006), 20(5): 643-660
URI: https://doi.org/10.1007/s11269-005-9000-4
http://repository.iitr.ac.in/handle/123456789/14958
Issue Date: 2006
Keywords: Antecedent moisture
Curve number
Initial abstraction
NEH-4
Soil conservation service
ISSN: 9204741
Author Scopus IDs: 55463271000
57206353875
6701641267
55555537300
Author Affiliations: Mishra, S.K., Department of Water Resources Development and Management, Indian Institute of Technology, Roorkee, India
Sahu, R.K., Department of Civil Engineering, Indian Institute of Technology Bombay, Powai, Mumbai, India
Eldho, T.I., Department of Civil Engineering, Indian Institute of Technology Bombay, Powai, Mumbai, India
Jain, M.K., National Institute of Hydrology, Roorkee, Uttaranchal, India
Corresponding Author: Mishra, S.K.; Department of Water Resources Development and Management, Indian Institute of Technology, Roorkee, India; email: skm61fwt@iitr.ernet.in
Appears in Collections:Journal Publications [WR]

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