Determining water flow efficiencies at Kah Pulo Geto primary irrigation channels, Bengkulu, Indonesia
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Abstract
Unproperly functions from the irrigation channels and networks cause inefficiently water distribution to supply rice fields for the paddy growth demand. The results showed that the water loss from the primary canal with whole channel length of 800 m at Kah Pulo Geto Bengkulu around 13.76% and at the same time the water efficiency in this channel amounted to 86.24%, slightly below the theoretical efficiency limit value, 90%. From 10 primary canals, 7 canals conveyed water inefficient to next channel networks. The water loss resulting inefficiency water supplies in the irrigation canals were caused by seepage, 1.351 x 10-4 m day-1 while the water loss through evaporation was about 0.0207 mm sec-1. Cracks and concrete damage occurrences causes the water seepage in the irrigation channel because of lack of maintenance.
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