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The main purpose of the construction of irrigation networks is to prevent water losses in the conveynce and distribution routes, as well as to control and optimize water use. A significant part of water losses in irrigation and drainage networks is related to the conveynce and distribution sector. Irrigation canals as one of the most important parts of irrigation and drainage networks have an effective role in reducing losses and increasing the conveynce and distribution efficiency of water. Water losses are due to water penetration in the channel walls, deep penetration and evaporation. In this research, in order to determine the conveynce efficiency, the input-output flow method was used with the use of a molecular device and flow cross-sectional segmentation. In order to influence the dimensions of the canal and the volume of water through the channel, and to achieve a better understanding of the leakage losses, the percentage loss per meter channel length was used compared to the inlet flow. There are 85 irrigation channels of grade 1 and 2 with concrete, earthy, concrete-earthy and earth-concrete types with trapezoidal, rectangular, canal and irregular shapes in Khuzestan province were studied and evaluated. 29 of these channels were grade 1, 40 channels of grade 2 and 16 distribution channels under farm management were evaluated. The range of conveynce efficiency varius from 60.98% to 98.3% in Behbahan city and the average was 89.99%. The range of changes in the leakage loss index varies from 0.22% to 38.38% in the Behbahan city and the average was 6.72%. To prevent water losses in irrigation canals, there should be some cases such as weed growth in canals, sediment accumulation in the canals, accumulation of waste in the canals, cracking of the canal cover, crushing or displacement concrete components in canals, destruction caused by inappropriate quality of used materials, destruction caused by executive issues, destruction caused by cultural and social issues, issues of exploitation and maintenance were eliminated.Keywords: Channels 1 and 2, Canals, Leakage losses
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