ANALYSIS OF PIT XZ DRAINAGE SYSTEM GEOMETRY IN X BLOCK AT PT ABC
Abstract
PT ABC is a lateritic nickel mining company located in Bungku Pesisir Subdistrict, Morowali Regency, Central Sulawesi. The research location, Pit XZ, does not yet have an adequate drainage system, resulting in water accumulation that disrupts mining operations. This study aims to design a drainage system consisting of open channels, culverts, and sedimentation ponds. A quantitative method was used, involving rainfall data analysis, identification of the catchment area, runoff discharge calculation using the Rational Method, and channel design using the Manning formula. The calculation results show a runoff discharge of 0.35 m³/second. Based on these results, open channels were designed at four locations: Location 1 with a base width of 0.84 m, top width of 1.46 m, and height of 0.60 m; Location 2 with a base width of 0.42 m, top width of 0.93 m, and height of 0.25 m; Location 3 with a base width of 0.49 m, top width of 1.08 m, and height of 0.30 m; and Location 4 with a base width of 0.40 m, top width of 0.89 m, and height of 0.24 m. The total channel length is 2,742 meters. The culverts are designed using iron material with a diameter of 0.50 m and lengths of 13 m, 19 m, 22 m, and 55 m, installed across mining roads. Meanwhile, the sedimentation pond is designed with three compartments, each measuring 27 m in length, 18 m in width, and 4 m in depth, with a total volume of 5,037.56 m³ and a dredging interval of every 120 days
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