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    SCS Runoff Equation Revisited for Variable-Source Runoff Areas

    Source: Journal of Irrigation and Drainage Engineering:;1995:;Volume ( 121 ):;issue: 003
    Author:
    Tammo S. Steenhuis
    ,
    Michael Winchell
    ,
    Jane Rossing
    ,
    James A. Zollweg
    ,
    Michael F. Walter
    DOI: 10.1061/(ASCE)0733-9437(1995)121:3(234)
    Publisher: American Society of Civil Engineers
    Abstract: Simple methods for predicting runoff from watersheds are important in engineering practice, particularly in flood forecasting and water-balance calculation. In this paper, we illustrate that the often used SCS runoff curve-number approach in its most elementary form can be derived from assuming that only the saturated areas contribute to direct runoff. With this approach the initial abstraction or the amount of water required before runoff starts is equal to air-filled pore space per unit area for the most shallow soil in the watershed. Air-filled pore space throughout the year was calculated with aid of the simple water balance employing the Thornthwaite-Mather procedure for the most shallow soil in the watershed. By plotting the effective precipitation defined as the amount of precipitation minus the initial abstraction against the observed runoff for two watersheds in Australia and three in the northeastern United States we found that the SCS curve-number equation in its elementary form fitted the data well.
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      SCS Runoff Equation Revisited for Variable-Source Runoff Areas

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    http://yetl.yabesh.ir/yetl1/handle/yetl/27654
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    • Journal of Irrigation and Drainage Engineering

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    contributor authorTammo S. Steenhuis
    contributor authorMichael Winchell
    contributor authorJane Rossing
    contributor authorJames A. Zollweg
    contributor authorMichael F. Walter
    date accessioned2017-05-08T20:48:08Z
    date available2017-05-08T20:48:08Z
    date copyrightMay 1995
    date issued1995
    identifier other%28asce%290733-9437%281995%29121%3A3%28234%29.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/27654
    description abstractSimple methods for predicting runoff from watersheds are important in engineering practice, particularly in flood forecasting and water-balance calculation. In this paper, we illustrate that the often used SCS runoff curve-number approach in its most elementary form can be derived from assuming that only the saturated areas contribute to direct runoff. With this approach the initial abstraction or the amount of water required before runoff starts is equal to air-filled pore space per unit area for the most shallow soil in the watershed. Air-filled pore space throughout the year was calculated with aid of the simple water balance employing the Thornthwaite-Mather procedure for the most shallow soil in the watershed. By plotting the effective precipitation defined as the amount of precipitation minus the initial abstraction against the observed runoff for two watersheds in Australia and three in the northeastern United States we found that the SCS curve-number equation in its elementary form fitted the data well.
    publisherAmerican Society of Civil Engineers
    titleSCS Runoff Equation Revisited for Variable-Source Runoff Areas
    typeJournal Paper
    journal volume121
    journal issue3
    journal titleJournal of Irrigation and Drainage Engineering
    identifier doi10.1061/(ASCE)0733-9437(1995)121:3(234)
    treeJournal of Irrigation and Drainage Engineering:;1995:;Volume ( 121 ):;issue: 003
    contenttypeFulltext
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