IRRIGATION SYSTEM PERFORMANCE EVALUATION: CASE OF KOG DAM AND IRRIGATION PROJECT

Abstract

Large irrigation systems have their own identity and have a very important role in economic development of many parts of the world. Therefore the aim of this study was to assess the performance of selected command blocks of koga dam and irrigation project for comparing their level of performance using minimum set of performance indicators. The study was also met its objective by collected and analyzed secondary and primary data of climatic, soil, Crop and water delivery or water use. Irrigation water applied on irrigable areas within the blocks was insufficient, too much or not the recommended water quantity. Therefore it was essential to revise irrigation schedule and the ways in which we managed water application uniformities, efficiencies and conditions of irrigation and drainage canals. The results of water delivery and agricultural performance indicators showed ranges of annual relative water supplied from 0.60 to 6.75; annual relative irrigation water supplied from 0.48 to 7.53; reliability of water delivered from 0.57 to 0.84; Adequacy 0.9 to 3.00 ; crop production from 3.8 to13.5 tons/ha; output per unit water irrigation water supplied from 0.32 to 3.8 kg/m 3 with irrigation ratio ranged 0,87 to 0.99.Therefore there should be strong argument for ensuring water delivery of the main and secondary canals made as reliable as possible thereby enhancing the management capacity of farmers to utilize irrigation water and land according to their own objectives at farm level. Keywords: Crop production, performance, performance indicators, irrigation water management