Amare Getnet*, Getnet Niguse and Temesgen Enku
The technical performance evaluation of Koga Irrigation Scheme was made in order to identify management practices for implementation to improve the system operation and the performance of the irrigation system. The evaluation was made based on the selected performance indicators such as water application efficiency, dependability of irrigation interval and sustainability of irrigated command area. The results obtained showed that Application efficiency monitored on three farmers’ farm located on different ends of the command ranges from 52.2 to 61.8% at irrigation scheme. Dependability of the schemes evaluated in terms of irrigation interval shows that the schemes irrigate more frequently than was intended. The sustainability of the irrigated area initially planned for development or the actual irrigated area during the design period was 7,004 ha. However currently it is irrigating about 6,200 ha. This shows that the sustainability of the scheme is 0.86 ~ 86%. In conclusion, on farm water loss was revealed in this study. Relatively highest sustainability of irrigation land value is operating and significant proportion of water is lost on farm areas. Therefore, if structures are in place and water users associations are empowered more in order for it to enforce its bylaws; it will augment the efficiency of the scheme exceedingly.
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