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Kotabaru district is an archipelago surrounded by sea with the intensity of rainfall is quite high. Regional Road H. Agus Salim is an area that is often flooded in the event of heavy rain and accompanied by a pair of sea water. This study aims to reassess the capacity of existing drainage channels and formulate measures that can be taken to overcome the flooding problems that plagued it every year. Analysis methods are used based on SNI 03-3424-1994. From the research, found that the dimensions of the existing channel to accommodate the design flow so that the channel needs to be fixed. In addition, the River Baharu should be normalized so that water can flow smoothly into the sea. Channel dimensions for 5 years when repeated for the STA is 0000 s / d 0 475 is 1.5 x 1.5 m, STA 0475 s / d 0 610 is 1.5 x 2 m and STA 0610 s / d 0 650 is 1.5 x 2 m. As for the reset time is 10 years STA 0000 s / d 0 475 is 1.5 x 1.8 m, STA 0475 s / d 0 610 is 1.5 x 2 m, and STA 0610 s / d 0650 is 1.5 x 2.3 m. Channels will be directly channeled to the sea through the sea siring. To prevent entry of sea water on the Jl. H. Agus Salim right (especially Gg. Dawn) need to be made automatic door system valve mounted on the estuary channel. At the time the river overflowed Baharu coupled with pair of sea water, to speed up the puddle of water out so that there should not be too long in the sea siring pump installed. The pump can be installed permanently or used mobile pumps. For pump mounted on the main channel in the estuary area Siring Sea.To prevent blockage of the channel due to the waste and sludge in the waste inlet filter installed by a distance of 50 m and fitted with control boxes so that the manhole cover will be stuck in the mud bath and cleaned periodically. Key word : drainage channels, overcome the flooding,
