Performance evaluation of water delivery systems at Ngenge Irrigation Scheme

Abstract

Water delivery performance is the degree to which whether the system delivers water at the required rate at the right place and time. This study was carried out for three month on a single irrigation season from November to January 2024. Water delivery performance of the scheme was evaluated by comparing irrigation water demand with actual irrigation water supply by using four (4) indicators classified water delivery indicators. To estimate the crop water requirements and irrigation water requirement of the project, CROPWAT for windows (CROPWAT 8.0) which have five data input modules (climate/ETO, rain, crop, soil and crop pattern) and three calculation modules (crop water requirement, schedule and scheme) was used. The water delivery performance indicators of the canal such as adequacy, efficiency, dependability and equity were computed for the successive months. To estimate these indicators, the values of delivered water (QD) and required (QR) of the irrigation scheme were taken as basic variables. The number of irrigations in one season (T) was considered as the time period; and the number of fields (R) will be taken as the sub-region.