Gemechis T, Quraishi SH and Zeleke T
This study attempted to conduct ArcGIS based diagnostic analysis of Irrigation scheme with intention of introduction of wise use of limited natural resources in case of Upper Awash for irrigation purpose. Experimental site selection criteria were that Boset woreda was one of the most chronically food in-secure districts, availability of secondary data and organizational set up of the irrigation projects. As to the output, simple model to calculate weighted overlay analysis of irrigation suitability was conducted and mapped, and from the map 4454 ha area was identified to be in suitable range for irrigation. Rainfall data records of 10 years (2003-2012) and Awash River stream flow of 21 years (1975-1995) records were adjusted for missing data, checked for consistency by developing double mass curve using three adjacent stations, analyzed for 80% stream flow dependability and was found to be 23.78 m3/s after giving allowance of 30% to downstream water use right. Finally, crop pattern of the study area was organized in CROPWAT 8.0 model along with necessary data such as climate, soil, and crop, cropping pattern. Maximum irrigation requirement with irrigation intensity of 100% was found to 137.5 mm/month in May from which net scheme supply design was calculated to be 5.67 m3/s and assuming 80% application efficiency total scheme supply design was found to be 7.1 m3/s .
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