Abstract
A simulation model was developed for Krishnagiri Reservoir Project (KRP), a surface irrigation system in Tamil Nadu. This model was used to evaluate the performance of the irrigation system under existing and optimum water use situations with change in crop pattem, lining of main canal and distributories. The model operated on a daily basis using data relating to rainfall, inflow, outflow, evaporation loss, seepage and percolation loss. The results of the study indicated that at existing water use level, there is considerable water deficit even with ground water supplementation and the physical improvements with change in crop pattern will not only reduce the water deficit but also increases the scope for area expansion
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