PT. Bima Putra Abadi Citranusa is a coal mining company in Lahat, South Sumatra that using open pit method. The current mining activity hampered because of overflowing sump so it is necessary to re-planning the drainage system. Based on the analysis amount of water entering the mine is 14.367,75 m3/day with a catchment area of 60.25Ha. The incoming water consists of runoff water of 14,393.88 m3…