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    PERFORMANCE EVALUATION OF SMALL SCALE IRRIGATION SCHEME IN ADDIS-ALEM, SEHARTI SAMRE WOREDA, TIGRAY, ETHIOPIA.
    (Hawassa University, 2017-10-28) ABRHA FENTAW AKALU
    Water is scarce and expensive resource which needs to be utilized in a highly productive manner for agriculture. The main objective of this study was to evaluate the performance of the small scale irrigation scheme at Addis-Alem, Seharti Samre Woreda, Tigray Regional State. The importance of performance evaluation of small scale irrigation scheme mainly for advising irrigators on how to improve their system and management practice, intervention across different system levels, and to compute irrigation seasons and technologies The scheme has command area of 60 ha during the current study time and serving about 240 beneficiaries. To achieve the aim primary and secondary data were gathered. The internal and external performances using minimum sets of performance which includes agriculture water use economical, and physical performances. In order to compute the irrigation water use efficiency of farmers at field level, nine farmer fields were identified from the irrigation scheme in the relation to their location (head, middle and tail end water users). The internal process which include conveyance, application, storage, runoff, deep percolation ratio, distribution efficiencies, and overall irrigation efficiency were used to check the performance of the irrigation scheme. The results of the analyses indicate that the conveyance and application efficiencies were found to be 51.297 and 68.07% respectively. The runoff ratio of the scheme was nil as the furrows are block end type. Deep percolation ratio in the same order of the scheme was found to 31.93%. Storage efficiency was also estimated 47.69%. Further, irrigation uniformity of98.91% was attended. From the analysis of external indicators, the output per cropped area and output per command area were found as 4545.455 and 1363.636US$ha-1 respectively. The output per irrigation supply of the scheme was 0.663 US$ m-3 . Output per water consumed in the scheme was 0.974 US$ m-3 . The water use performance of the scheme was computed, water supply and relative irrigation supply were found as 7.362.The irrigation ratio of the scheme was found to be 0.30 which means about 70% of the command area is not under irrigation during the study period. In general,, the performance of Addis-Alem irrigation scheme is low . But there is still a room for improving the performance of the scheme by resizing the main canal as well as the secondary and tertiary canals which were not adequately carrying the required irrigation water
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    PERFORMANCE EVALUATION OF CHANCHO SMALL SCALE IRRIGATION SCHEME IN LOKA ABAYA WOREDA, SIDAMA REGIONAL STATE, ETHIOPIA
    (Hawassa University, 2023-12-18) MATO ASFAW
    Performance evaluation of irrigation schemes helps to know the present status of the scheme and enables to employ possible measures for improvement. Efficient operation and management for irrigation system plays an important role in the sustainability of irrigated agriculture. This study was initiated to evaluate the performance of Chancho small-scale irrigation scheme using internal performance indicators. Primary data collected for this study include field discharge measurement and determination of soil physical properties in laboratory. Secondary data were collected from different sources. Internal performance indicators used in this study were efficiency parameters (conveyance, application, and storage), distribution uniformity, deep percolation loss, depth of irrigation and irrigation interval. The result of study showed that average conveyance efficiency MC and SC-1and SC-2 were 64.68, 64.1 and 65.4% respectively. Water distribution uniformity at the head, middle, and tail of the field were 72.6, 66.6, and 75.2% respectively. Application efficiency of head, middle and tail end of selected field were 49.3, 51.4 and 68.7% respectively. Water storage efficiencies of head, middle and tail end of selected fields were 83.4, 80.2 and 87.7% respectively. The result of the study showed that average over all conveyance efficiency, average application efficiency, scheme storage efficiency and average deep percolation loss were 65.1, 56.5, 83.7 and 43.5% respectively. The result of the study also showed that farmer’s application depth of irrigation water was lower than depth of irrigation water that would be required to fill root zone to field capacity. As result showed calculated irrigation intervals was greater than farmer adopted. The study showed that over all irrigation efficiency was relatively poor .Generally, overall performance of the scheme is considered as low. So it is important to adopt water management practices, frequent training of irrigation water user farmers and maintenance canal water conveyance system to achieve good performance of the scheme