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Title: Long-term hydrologic simulation using SCS-CN-based improved soil moisture accounting procedure
Authors: Durbude D.G.
Jain M.K.
Mishra, Surendra Kumar
Published in: Hydrological Processes
Abstract: The Soil Conservation Service Curve Number (SCS-CN) method is widely used in determination of direct surface run-off in long-term (continuous) hydrologic simulation models. Of late, Michel et al. (2005) reviewed the soil moisture accounting (SMA) procedure that lies behind the original SCS-CN method and pointed out severe structural inconsistencies in the treatment of antecedent condition and, in turn, proposed a sounder methodology. However, this method still needs refinement in the definition of initial moisture level (V0) to make it usable in field. Thus, in the present study, the Michel et al. (2005) model is modified to avoid the unrealistic sudden jump in V0 by incorporating conceptual SMA procedure and variation of daily CN based on antecedent moisture amount instead of antecedent moisture condition. When applied to 17 watersheds from different agro-climatic regions of India, the proposed model simulates daily stream flows better than those due to Michel et al. model. The proposed model performed better in high run-off producing (wet) watersheds than in low run-off producing (dry) watersheds, and the base flow was more and less significant in high and low run-off producing watersheds, respectively, whereas the evapotranspiration showed a reverse trend. Copyright © 2010 John Wiley & Sons, Ltd.
Citation: Hydrological Processes (2011), 25(4): 561-579
Issue Date: 2011
Keywords: Antecedent moisture condition
Curve number
Initial soil moisture level
Long-term hydrologic simulation models
Soil moisture accounting procedure
Stream flow
ISSN: 8856087
Author Scopus IDs: 15839072000
Author Affiliations: Durbude, D.G., Department of Environment Hydrology, National Institute of Hydrology, Roorkee, Uttarakhand, India
Jain, M.K., Department of Hydrology, Indian Institute of Technology, Roorkee, Uttarakhand, India
Mishra, S.K., Water Resources Development and Management, Indian Institute of Technology, Roorkee, Uttarakhand, India
Corresponding Author: Jain, M.K.; Department of Hydrology, Indian Institute of Technology, Roorkee, Uttarakhand, India; email:
Appears in Collections:Journal Publications [WR]

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