COMPARATIVE ASSESSMENT OF WATER MANAGEMENT PRACTICES IN SELECTED SMALL SCALE IRRIGATION SCHEMES: CASE STUDY OF WOTER-02, ARARA AND HAJIFEJA SCHEMES IN EAST HARARGHE ZONE

Abstract

This study was initiated to evaluate the performance of three small-scale irrigation schemes found in Qersa district, namely, Arara, Woter-02 and Hajifaja schemes using selected performance indices. The technical evaluation was made by measuring selected performance indicators such as conveyance efficiency, Application efficiency, sustainability of irrigated command area ratio and comparative performance indicators such as water productivity and land productivity. Moreover, water management practices and dependability of the irrigation interval was also investigated through a questionnaire of the sample household survey. Overall activities in primary data collected included: field observation, interviewing beneficiary farmers, soil sample taking and discharge measurements in the canals. In addition to the primary data, secondary data such as meteorological data and agricultural production were collected from the secondary sources from zonal and Woreda irrigation development office and DA of PA and other respective offices. The results showed that the main canal conveyance efficiencies of the three schemes, Arara scheme, Hajifaja scheme and Woter-02 scheme, were 85%, 82.33% and 79.3% respectively. The maximum value of application efficiency was found in downstream field, at Hajifaja scheme 70.79% and the minimum value was in the Woter 02 scheme at upstream field 41.04%. From analysis of water supply and demand following results were obtained. Relative Water supply is 1.1, 1.4 and 1.8 at Hajifaja, Arara and Woter-02 schemes respectively, and Relative Irrigation Supply is 1.1, 1.6 and 2.1 at Hajifaja, Arara and Woter-02 schemes respectively. The results indicate that released water from diversion is more than the requirement; it can develop extra comma nd if managed properly. The production output results include agricultural inputs. Output per unit irrigated command area in Birr/ha was 190,386, 210,701 and 213,622 at Arara, Hajifaja and Woter-02 scheme respectively. Outputs per unit irrigation water supply were 12, 15 and 25 Birr/M 3 at Woter-02, Arara and Hajifaja scheme respectively. Output per unit irrigated water delivered is 16, 17, and 30 Birr/M 3 for Woter-02, Arara and Hajifaja scheme respectively. Whereas output per unit water supply were 10, 11 and 17 Birr/M 3 at Woter-02, Arara and Hajifaja scheme respectively. The results reveal that hajifaja scheme is performing better than Arara and Woter-02. Factors that affect the productivity of schemes are poor water management, farm structures’ deterioration, improper irrigation schedule and other agricultural input utilization. Improvement measures should be taken in terms of rehabilitation of the schemes, creating farmers’ awareness for water management and input utilization and frequent maintenance of schemes.