Institute of Technology
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Item COMPARATIVE EVALUATION OF ELA AND LINTALA SMALL SCALE IRRIGATION SCHEMES, WOLAITA ZONE, SOUTHERN ETHIOPIA(Hawassa University, 2018-07-25) ISRAEL KASSA KUMAIrrigation schemes are usually constructed to deliver service on the assumed efficiency. Due to the schemes’ age and management practice, service rendering status of schemes may be below assumed performance level. Non- operational parts of the irrigation schemes were commonly seen in the study schemes. Therefore these study schemes were evaluated with the help of internal and external performance indicators. Internal performance indicators were conveyance efficiency, application efficiency, irrigation adequacy and uniformity. External performance indicators were water delivery performance and water productivity. Water delivery parameters used were Relative Irrigation Supply, Relative Water Supply, and Water Delivery Capacity. The water productivity of the schemes was also compared with respect to the irrigation water used. Conveyance efficiencies of Ela and Lintala schemes were 86% and 81%, and also Irrigation application of these schemes were 55% and 42%. So that, system efficiencies of Ela and Lintala small scale irrigation schemes were 47% and 34%. So that in Ela irrigation scheme water management in the field was better than Lintala scheme. Also Storage efficiencies in Ela and Lintala plots were 86% and 81%. So, in irrigation time, selected plots acquired the required irrigation depth fairly. And calculated Irrigation uniformity in these plots were 88% and 77%. In Ela irrigation scheme, Relative water supply and Relative irrigation supply was in the interval 0.95-1.96 and 0.94-2.4. In these intervals the lower values 0.95 and 0.94 were obtained in the month February. This revealed the scheme water delivery performance couldn’t answer ETc of the crops in driest month. But its water delivery capacity of main canal was 3.8. So Ela scheme canal capacity was not constraining factor for croping intensity. The Relative water supply and Relative irrigation supply of Lintala was in the intervals 2.53-3.73 and 2.8-4.5. And also its main canal capacity was 2.2. So that this scheme water delivery performance was enough to answer the ETc of the crops. In existing water management, average irrigation water productivity of maize in Ela and Lintala plots was 0.89 and 0.52 kg per m3 of irrigation water reaching the farm.Item EVALUATION OF THE PERFORMANCE OF TRADITIONAL IRRIGATION SYSTEM IN DEGALUNA TIJO WOREDA, ARSI ZONE, OROMIA REGION(Hawassa University, 2018-03-25) Seyoum Tadesse H/mariamThis study was carried out at Degaluna Tijo Woreda traditional irrigation scheme with the objectives of characterization of the scheme, evaluating the performance of scheme using XV selected performance efficiency indicators and analyzing water productivity in relations to water applied. In the highlands of Ethiopia, irrigation practices have long been in use since ancient times for producing food crops. It was low momentum irrigation development, whereas the developed irrigable land had not been irrigating as expected. The areas that had been to use accounts less than 20% of the total irrigable land. It was made by measuring canals capacity and efficiency, length of water flow. Performance evaluation of the scheme was made using selected performance indicators such as conveyance, application, storage efficiencies, and distribution uniformity along with the water productivity in terms of water use efficiency as well as external indicators. The result obtained showed that conveyance efficiency of 82.69%, 75.27 %, and 80.45%, respectively. In the field that application efficiency, storage efficiency and irrigation efficiency on economic eight farmers’ plot located on different ends of the command 49-58%, 42-60 % and 57-89% upper, middle and downstream irrigation scheme respectively. Regarding the output per area, Temela Gusha was better than other systems, but for the output per water supply the converse was true that is, Hobori was better than others were. The institutional arrangement was poorly to support the irrigation farm association and crop pattern trends with the crop water consumption. It observes that from time trend of remote sensing image environmental climate condition famine change rapidly accelerated from time to time