Abstract:
Irrigation schemes are usually designed and implemented on the basis of assumed
efficiencies in water application, water conveyance, and water distribution. However, over
time, physical changes in the schemes such as poor maintenance of structures, soil property
changes and deterioration of equipment may alter these efficiencies. It is therefore
imperative that the efficiencies are periodically evaluated as a way of monitoring and
evaluating the irrigation scheme. The study was conducted to assess the performance of the
two wonji -Shoa expansion irrigation schemes using various indicators such as output per
unit cropped area and water consumed, related to production with land and water. Relative
water supply (RWS), irrigation supply (RIS) and water delivery capacity (WDC), related to
water supply from the system with crop water demand. The irrigation schemes were Ulaga
zone100 and Ulaga zone200. In this study, the performance indicators in Ulaga zone100
and Ulaga zone200 Irrigation Scheme were determined for year 2013/14; the results were
discussed and evaluated. Moreover, the research assesses the main problems in the major
component of dragline sprinkler systems, and suggest the possible solution.
The necessary primary and secondary data to calculate the eight indicators were collected.
Primary data collection included daily field observation related to the conveyance systems,
measurement of the actual dimensions of the conveyance systems, measurement of the
actual dimensions of the structure, measurement of pressure at inlet of each field, Interview
of technical experts and assistances, geographical coordinates (Longitudes & latitudes) of
the scheme.
The secondary data were collected from Ethiopian Sugar Development Agency Research
Center and from Water Works Design and Supervision Enterprise, which included
topographic map of specific site, meteorological and Hydrological data, and design
document of a scheme, total yields and investment costs.
