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Modifications to SCS-CN method for long-term hydrologic simulation

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Title Modifications to SCS-CN method for long-term hydrologic simulation
 
Creator GEETHA, K
MISHRA, SK
ELDHO, TI
RASTOGI, AK
PANDEY, RP
 
Subject curve-number technique
runoff
hydrologic models
simulation
watershed management
moisture
catchments
 
Description The original soil conservation service curve number (SCS-CN) technique is primarily used to transform daily rainfall into surface runoff by assuming the proportionality between retention and surface runoff based on a parameter referred to as curve number (CN). The conventional method does not take into account the temporal and spatial variability of curve number. In this paper, an attempt has been made to modify the existing SCS-CN model in two ways by varying the CN using antecedent moisture condition (designated as Model 1), and by using antecedent moisture amount (designated as Model 11). The daily moisture storage is updated based on varying the curve number and other hydrologic abstractions. These two different models are constructed to compute streamflow components: Direct surface runoff, base flow, and hydrological abstractions. These methodologies were successfully applied to daily data of catchments of Cauvery, Narmada, Ganga, and Ulhas Rivers, lying in different climatic regions of India, and the results were analyzed. Application of Model I to Hemavati (a tributary of River Cauvery, Karnataka State) data yielded maximum efficiency of 84% in calibration, and minimum efficiency of 54% with Ramganga (a tributary of River Ganga, Uttaranchal State) data, whereas Model 11 showed maximum efficiency of 85% in Hemavati catchment and minimum efficiency of 64% in Kalu catchment (a tributary of River Ulhas, Maharashtra State). Model 11 performed better than Model I on all four catchments. It is found that the proposed models reasonably simulate the catchment response and these SCS-CN-based models are applicable to complex natured watersheds.
 
Publisher ASCE-AMER SOC CIVIL ENGINEERS
 
Date 2011-07-18T12:56:55Z
2011-12-26T12:50:37Z
2011-12-27T05:36:25Z
2011-07-18T12:56:55Z
2011-12-26T12:50:37Z
2011-12-27T05:36:25Z
2007
 
Type Article
 
Identifier JOURNAL OF IRRIGATION AND DRAINAGE ENGINEERING-ASCE, 133(5), 475-486
0733-9437
http://dx.doi.org/10.1061/(ASCE)0733-9437(2007)133:5(475)
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4923
http://hdl.handle.net/10054/4923
 
Language en