PT Gorby Putra Utama is a coal mining company in North Musi Rawas District, South Sumatera. The coal mining of PT Gorby Putra Utama is carried out using the open pit mining method. This study aims to determine the flow of water entering the mine so that the ideal sump volume will be known to accommodate the water discharge, the pump capacity capable of removing water from the sump and the volum…