CAPABILITY OF THE SCS-CN METHOD IN ESTIMATING RUNOFF IN DRY-FARMING LANDS OF A SEMI-ARID REGION IN THE NORTH WEST OF IRAN

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VAEZI A.R.; SADEGHI S.H.R.

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Journal: IRANIAN JOURNAL OF WATERSHED MANAGEMENT SCIENCE AND ENGINEERING Year:2011 | Volume:5 | Issue:14 Page(s): 11-22

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Title

CAPABILITY OF THE SCS-CN METHOD IN ESTIMATING RUNOFF IN DRY-FARMING LANDS OF A SEMI-ARID REGION IN THE NORTH WEST OF IRAN

Author(s)

VAEZI A.R. | SADEGHI S.H.R. | Issue Writer Certificate

Keywords

RUNOFF ESTIMATIONQ2

SCS-CN METHODQ2

INITIAL ABSTRACTION RATIO AND HASHTROODQ2

Abstract

The SCS-CN METHOD as a traditional method is widely used for the estimation of direct runoff for a given rainfall event from small agricultural watersheds. In this method, the ratio of initial abstraction (Ia) to maximum potential retention (S) that is defined as initial abstraction ratio (l=Ia/S) is equal to 0.2. This constant (l=0.2) is the most ambiguous assumption and requires considerable refinement. The objectives of this study were assessment of capability of the SCS-CN METHOD in estimating runoff, and determine the initial abstraction ratio, by analyzing measured rainfall-runoff events. Rainfall data was taken from a recording rain gauge and runoff data obtained from measurement of runoff volume in 36 dry-farming lands in the Hashtrood, northwestern Iran in a two-year period from March 2004 to March 2007. The analysis of 41 rainfall-runoff events data indicated that runoff generation is linearly (R2=0.68, P<0.001) related to rainfall height. Out of 41 rainfall events only 13 events have a rainfall height value bigger than the initial abstraction value and so based on the SCS-CN METHOD they had a potential to generate runoff. Average observed runoff values in 41 events were 2.988 times higher than the estimated runoff values in the study area. The correlation between the observed and estimated runoff was low (R2=0.21). The efficiency coefficient (E) of the SCS-CN model in 36 study lands was low, with an average of -8.032. The results revealed that the SCS-CN METHOD has a low accuracy in estimating runoff in the study area due to considering a high initial abstraction ratio value (Ia/S=0.2). Data analysis showed that an initial abstraction ratio of 0.02 can modify the RUNOFF ESTIMATION of the SCS-CN METHOD in the study area. With using of this constant (l=0.02), the correlation between the observed and estimated runoff values increased to 0.53 and also the model efficiency coefficient (E) improved to -0.194.

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APA: Copy

VAEZI, A.R., & SADEGHI, S.H.R.. (2011). CAPABILITY OF THE SCS-CN METHOD IN ESTIMATING RUNOFF IN DRY-FARMING LANDS OF A SEMI-ARID REGION IN THE NORTH WEST OF IRAN. IRANIAN JOURNAL OF WATERSHED MANAGEMENT SCIENCE AND ENGINEERING, 5(14), 11-22. SID. https://sid.ir/paper/134885/en

Vancouver: Copy

VAEZI A.R., SADEGHI S.H.R.. CAPABILITY OF THE SCS-CN METHOD IN ESTIMATING RUNOFF IN DRY-FARMING LANDS OF A SEMI-ARID REGION IN THE NORTH WEST OF IRAN. IRANIAN JOURNAL OF WATERSHED MANAGEMENT SCIENCE AND ENGINEERING[Internet]. 2011;5(14):11-22. Available from: https://sid.ir/paper/134885/en

IEEE: Copy

A.R. VAEZI, and S.H.R. SADEGHI, “CAPABILITY OF THE SCS-CN METHOD IN ESTIMATING RUNOFF IN DRY-FARMING LANDS OF A SEMI-ARID REGION IN THE NORTH WEST OF IRAN,” IRANIAN JOURNAL OF WATERSHED MANAGEMENT SCIENCE AND ENGINEERING, vol. 5, no. 14, pp. 11–22, 2011, [Online]. Available: https://sid.ir/paper/134885/en

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