Abstract
Song River is a small river with a wide variety of 5 to 18 meter of water sourced from Lake Batur to the south through Bunutin Village in Kintamani District, Bangli Regency. The existence of this river is important because it is the main source of irrigation water in the Bunutin agricultural land which covers about 152 ha of rice fields. Utilization of Song river discharge for irrigation on Bunutin agricultural land has relied on water from community rock piles with water extraction in the form of 1.2 km of land tunnel. The tunnel has a high variable dimension of 0.75 to 1 meter and a varied width of 0.6 to 0.8 meter. This research was conducted through the stages of observation, measurement and analysis of river characteristics. The results of the flood analysis showed Q50 is equal to 21.81 cubic meter per second. Based on the existing situation, the placement of weirs is placed behind a tunnel with a width of 18 meter in the form of ogee crest weir. Weir material in the form of stone pairs.
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