Abstract
Water losses on the irrigation area affect the efficiency level of the drainage on the irrigation system, distribution of water can be told as efficient if the discharge of water which distribute by irrigation drainage optimally match to the need of water on the agricultural field. The purposes of this research are to analyze how much water losses on the primary drainage and secondary drainage and also to analyze the efficiency achieved on the water distribution of the Suban River Irrigation System. Efficiency and Water losses analyzed with measurement of incoming discharge and outcoming discharge on the primary drainage and secondary drainage, then for the measurement of flow velocity by the buoy method. Based on the analysis, total of water losses on the Suban Irrigation system is 6.46% and efficiency value on the primary drainage as 92.32%, efficiency value on the secondary left drainage as 95.40% and efficiency value on the secondary right drainage as 92.90%. From the efficiency of drainage it can be obtained that the total efficiency of drainage as 93.54%, which the Irrigation System of the Suban river classified as good condition.
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