Abstract
In this study, Remote Sensing (RS) and Geographical Information System (GIS) are used to estimate the crop coefficient (Kc) and crop evapotranspiration (ETc) of the Betwa basin (Area = 43,500 km2) of Central India. Reference crop evapotranspiration (ETo) was calculated for 18 stations of the Betwa basin using CROPWAT 8.0 software for November to April. Crop coefficients were estimated by developing its relationship with RS derived Soil Adjusted Vegetation Index (SAVI). The Kc and ETo maps for respective months were integrated to obtain spatial variation of crop evapotranspiration (ETc) in the Betwa basin. Analysis revealed that irrigation water requirements in the Betwa basin from November to April were 54.57, 85.74, 74.54, 63.82, 71.62, and 23.14 Mm3. Further, trend analysis of irrigation water requirement using Mann–Kendall test and Sen’s slope estimator showed a negative trend in Rabi season except in the month of December.
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