Volume 3, Issue 3 (2015)                   ECOPERSIA 2015, 3(3): 1031-1049 | Back to browse issues page

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Moatamednia M, Nohegar A, Malekian A, Karimi K, Tavasoli A. Performance of Different Models for Curve Number Estimation (Case study: Bar Watershed in Khorasan Razavi Province, Iran). ECOPERSIA 2015; 3 (3) :1031-1049
URL: http://ecopersia.modares.ac.ir/article-24-10395-en.html
1- Ph.D. Students of Watershed Management Science and Engineering, Department of Watershed Management, Agriculture and Natural Resources Faculty, University of Hormozgan, Bandar Abbas, Iran
2- Professor of Education, Programming and Environment Management Department, Faculty of Environmental Sciences, Tehran University, Karaj, Iran
3- Associate Professor, Faculty of Natural Resources, University of Tehran, Karaj, Iran
4- Expert, Natural Resources Office, Bafgh Township, Yazd, Iran
Abstract:   (5762 Views)
Among different models for runoff estimation in watershed management, the Soil Conservation Services-Curve Number (SCS-CN) method along with its modifications have been widely applied to ungauged watersheds because of quickly and more accurate estimation of surface runoff. This approach has been widely accepted by hydrologists, water resources planners, foresters, and engineers, as well. Therefore, this work was aimed to estimate the curve number using CN-values through several methods viz. SCS, Sobhani (1975), Hawkins et al. (1985), Chow et al. (1988), Neitsch et al. (2002) and Mishra et al. (2008) in Bar Watershed, Iran. According to the results, the Neitsch formula showed the best performance for estimating the Curve Number in situation with low (CNI) and high (CNIII) antecedent moisture conditions. However, the weakest performance was related to Mishra (2008) in CNI and CNIII-conversions. The weakest performance was resulted from the exponential form of the Neitsch et al. formula and the variable meteorological conditions of the Bar Watershed over the year.
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