The objective of irrigation is to make an assured supply of water available at a reasonable cost and an appropriate time. When he/she has a reliable supply of water a farmer can plan agricultural activities in advance and thereby improve productivity. Water is seasonally plentiful in Nepal but there is often no supply of water to irrigate cultivated land and cropland1. Despite the heavy investment in surface irrigation in the past, access to water from the many canals built is unreliable. This has resulted in low, and even declining, agriculture production.