COMPARATIVE PERFORMANCE ASSESSMENT OF MOJO ASHA AND ADANO SMALL SCALE IRRIGATION SCHEMES IN EAST HARARGHE ZONE, OROMIA REGION

Abstract

This study attempts to assess and cross-compare the performance of two small-scale irrigation schemes found in Oromia regional state namely, Mojo Asha and Adano irrigation schemes using comparative indicators. After collection of the valuable data from various sources, data analysis techniques were implemented for evaluating their performance using selected performance indicators such as conveyance efficiency, Application efficiency, system efficiency, water productivity and land productivity. The results showed that the average conveyance efficiencies of the two schemes were 83.41 % and 76.78 % at Mojo Asha and Adano respectively. It was lower at Adano than Mojo Asha scheme due to poor water management and irrigation structures’ deterioration. The maximum value of application efficiency found in downstream field of Mojo Asha scheme were 65.43 % and the minimum value was found in the Adano scheme at upstream field 40.45 % due to much amount of water was applied to the field without considering water requirement. The results of water use performance also indicated that the ratio of annual relative water supply were1.09 and 1.19 at Mojo Aasha and Adano schemes respectively, and ratio of annual relative irrigation supply were 1.12 and 1.27 at Mojo Aasha and Adano schemes respectively. The result indicated that water distribution is not tightly related to crop water demand or applying more than the demand. From analysis of agricultural performance the output results showed that the outputs per unit irrigation supply were 8.62 and 7.92 Birr/m3 at Mojo Asha and Adano schemes respectively. Whereas output per unit irrigation delivered were 10.78 and 9.70 Birr/ m3 at Mojo Asha and Adano schemes respectively. Outputs per unit command area in Birr/ha were 82501 and 96750 at Mojo Asha and Adano scheme respectively. Outputs per unit irrigated cropped area in Birr/ha were 55237 and 56437.5 at Mojo Asha and Adano schemes respectively. In case of water productivity Mojo Asha scheme was performing better than Adano scheme due to more productive use of irrigation water while land productivity was performing better at Adano than Mojo Asha scheme due to more intensive irrigation and better investment. Generally evaluation results of different indicators give information of performance level of the schemes that enables to transfer best practice to propose improvement measures.