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Title: Development of a Modified SMA Based MSCS-CN Model for Runoff Estimation
Authors: Singh P.K.
Mishra, Surendra Kumar
Berndtsson R.
Jain, Manoj Kumar
Pandey R.P.
Published in: Water Resources Management
Abstract: The Soil Conservation Service Curve Number (SCS-CN) method developed by the USDA-Soil Conservation Service (SCS, 1972) is widely used for the estimation of direct runoff for a given rainfall event from small agricultural watersheds. The initial soil moisture plays an important role in re-structuring of the SCS-CN method and enables us to prevent unreasonable sudden jump in runoff estimation and this has prompted the concept of soil moisture accounting (SMA) procedure to develop improved SCS-CN based models. Applying the concept of SMA procedure and changed parameterization, Michel et al. Water Resour Res 41(2):1–6 (2005) developed an improved SCS-CN model (MSCS-CN), which could be thought of an improvement over the existing SCS-CN method; however, their model still inherits several conceptual limitations and inconsistencies. Therefore, in this study an attempt is made to propose an improved SMA based SCS-CN-inspired model (MMSCS-CN) model incorporating a continuous function for initial soil moisture and test its suitability over the MSCS-CN and SCS-CN model using a large dataset from US watersheds. Using, Nash and Sutcliffe efficiency (NSE) and root mean square error (RMSE) of these models, the overall performance is further evaluated using rank grading system, and it is found that the MMSCS-CN scores highest mark (95; overall rank I) followed by MSCS-CN with 61 (overall rank II), and SCS-CN model with 51 mark (overall rank III) out of the maximum 105. This study shows that the proposed MMSCS-CN model has several advantages and performs better than the MSCS-CN and the existing SCS-CN model. © 2015, Springer Science+Business Media Dordrecht.
Citation: Water Resources Management, 29(11): 4111-4127
Issue Date: 2015
Publisher: Kluwer Academic Publishers
Keywords: Curve number
Initial abstraction
Initial soil moisture
Proportionality concept
SCS-CN method
Soil moisture accounting
ISSN: 9204741
Author Scopus IDs: 57208371734
Author Affiliations: Singh, P.K., Department of Soil & Water Engineering, AAU, Anand, Gujarat, India
Mishra, S.K., Department of Water Resources Development & Management, IIT Roorkee, Roorkee, Uttarakhand, India
Berndtsson, R., Department of Water Resources Engineering/Center for Middle Eastern Studies, Lund University, Lund, Sweden
Jain, M.K., Department of Hydrology, IIT Roorkee, Roorkee, Uttarakhand, India
Pandey, R.P., National Institute of Hydrology, Roorkee, Uttarakhand, India
Corresponding Author: Singh, P.K.; Department of Soil & Water Engineering, AAUIndia
Appears in Collections:Journal Publications [HY]

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