Monitoring and Modelling Approaches for Quantitative Assessment of Irrigation Return Flows in a Command
ENVIRONMENTAL EARTH SCIENCES(2024)
National Institute of Hydrology
Abstract
Irrigation is one of the major consumers of fresh water but crops consume only a small part of supplied water and huge quantities emerge downstream as rejuvenated flow and recharge groundwater. The assessment of these flows is cumbersome due to dependence on multiple factors; hence a fixed percentage is assumed by government agencies for designing downstream projects. Three different modeling and measurement techniques, i.e., water balance, isotopic analyses, and hydrological modeling were used to compute surface and sub-surface components of irrigation return flow in an irrigation project (Sanjay Sagar Project with the capacity of 82 MCM and 9863 ha command area) situated in the hard rock region of Central India. The water balance analysis confirmed that a major portion ranging from 12.3 to 35.9
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Key words
Irrigation return flow,Isotopes,Regenerated flow,Recharge,SWAT,Water balance
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