Abstract:
It is realized that precise and controlled water applications are necessary to achieve the desired yield and water use efficiency. However, traditional irrigation activities are blamed for inefficiency of the use of irrigation water. This research has been conducted to problem assessment in Shina traditional irrigation Scheme and to recommend indicative irrigation schedules to be used by the farmers on a number of commonly irrigated crops in the study area to increase crop yields, water efficiency and also how to reduced water logging and nutrient leaching. To realize these objectives, structured household survey questionnaires, interviews, group discussions, field observations and literature were used. For household survey questionnaires a total of 40 sampled households were randomly selected from head, middle and tail end of command area beneficiary farmers. Performance of Shina irrigation Scheme was evaluated using some selected internal indicators (conveyance efficiency, application efficiency, water storage efficiency and distribution efficiency). Overall activities in primary data collected included: - field observation, measurements and interviewing beneficiary farmers. In addition to primary data, secondary data were collected from the secondary sources and included total intended irrigable area; initial irrigated area and intended discharge delivered to the main canal. The conveyance efficiency of the scheme was founded to 41.44 %, application efficiency of 44.08 %, storage efficiency of 41.36 %, distribution efficiency of 88.02 % and the overall scheme efficiency was 18.26%. The study shows that is the irrigation scheme is operating under low efficiency. The total water requirement of Garlic crop was found as 310.5 mm for the cropping season. Garlic, is sensitive to water stress and yield was significantly affected. The study has revealed that water management in traditional irrigation schemes is very inefficient and usually involves too much or too low applications resulting not only in loss of the water resources but also yield of crops. On the basis of study the following recommendations can be made: aware farmers through workshops, maintenance and repair works, infrastructure upgrading, training framers, encourage interaction and knowledge sharing between DAs, farmers and researchers and preparation irrigation water taxes and auditing.