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Water Science & Technology Vol 53 No 10 pp 131–139 © IWA Publishing 2006

Regionalization of rainfall–runoff processes in rice agriculture dominated watersheds

N.V. Rajyalakshmi* and S. Dutta**

*Department of Civil Engineering, Indian Institute of Technology Guwahati, Guwahati, India, 781039 (E-mail: subashisa@iitg.ernet.in)
**Department of Civil Engineering, Indian Institute of Technology Guwahati, Guwahati, India, 781039 (E-mail: subashisa@iitg.ernet.in)


ABSTRACT
An approach for computing the instantaneous unit hydrograph of rice agriculture dominated watesheds is proposed using the topology and hydraulic charcterstics of its stream network and the hydrologic behaviour of the rice agriculture area. The effect of rice agriculture on the watershed response is considered as partial sink areas. The sink factor, a time-variant weight factor for a particular storm event, is computed from the daily water balanace equation of the rice field. The critcal features of the simulated instantaneous unit hydrographs in three gauged watersheds located in the river Mahanadi, India were then compared with that of the observed 24-hr unit hydrograph. The comparison shows a significant correlation between the two results.

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