Abstract: Greengram and Chickpea are the major protein rich grain legumes predominately cultivated in Dharwad district of Karnataka. The present study was aimed to determine the water requirement of greengram and chickpea using CROPWAT model for Dharwad. The decadal analysis was done under past (1991-2020) and projected climate (2021-2050) as per the recommended practices of UAS, Dharwad across four dates of sowing from 07th June to 28th June at weekly interval for greengram and four dates of sowing from 01st October to 15th November at quarterly interval for chickpea. Model simulated an increase of 42.6 mm and 37.5 mm of ETc and IR respectively, and decrease of 91.4 mm of ER under projected climates for greengram. In chickpea model simulated an increase of 61.0 mm of ER and a decrease of 71.4 mm ETc and 108.1 mm of IR under projected climates when compared to past for chickpea. Under projected climates in greengram, the yield under rainfed condition and average number of irrigations reduced by 10 % and 8.3 % respectively on black soil and on red soil 3.8 % and 140 %, respectively compared to past climates. In chickpea, under projected climates, the yield under rainfed condition and average number of irrigations reduced by 18.5 % and 42.9 %, respectively. Sowing late i.e., on 28th June in greengram and sowing early i.e., on 01st October in chickpea under projected climate simulated the least reduction in yield and less number of irrigation would be required for Dharwad district of Karnataka State.