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The research objective is: (1) to determine the flow of water to be drained by the drainage-way intersection of Simpang Busur of Tunjum Village for 25-yearly, and (2) to plan the drainage channel dimensions for 25-yearly.The experiment was conducted for 3 three months, located at the intersection of Busur roads up to the end of the Tunjum Village, Barong Tongkok sub district of West Kutai Regency. Research activities include: (1) the preparation phase i.e.: the collection of secondary data (rainfall data for 10 years from 2002 to 2011; contours and topographic maps / earth way of Coordination Agency for Surveys and National Mapping Bogor, RTRW Sendawar Town, Monography of Barong Tongkok Village, Barong Tongkok sub district of West Kutai Regency in 2012, primary data collection (surveys to identify conditions of study area / land and its potential, observations, interviews with some of the residents who live in areas around the drainage system, and take a photo documentation of the study area); (2) stage of analysis or study, include: hydrological analysis, calculation / drainage planning and design, and (3) the final stages of planning, include: create cross-sectional images of drainage channels and reports writing.The results of the research showed that: (1) discharge of water that must be drained by channels at intersections road of Busur at Tunjum Village Segment I (Right) of 0.084 m3/second while Segment II (Left) of 0.090 m3/second; (2) the dimensions of the calculation drainage design for the 25-yearly for Segment I was Qchannel = 0.084 m3/second, W = 0.730 m, T = 1.030 m, b = 0.562 m, d = 0.156 m, h = 0.886 m, and I basic channels = 0.071%; And (3) dimensional calculations for the design of drainage channels for 25-yearly at Segment II is Qchannel m3 = 0.090, W = 0.730 m, T = 1.206 m, b = 0.658 m, d = 0.183 m, h = 0.913 m, and I basic channels = 0.071%.
Keyword: Drainage Planning
