Evaluasi Kapasitas Kolam Pengendapan untuk Menampung Limpasan Area Disposal Tambang Batubara di Kalimantan Selatan

dianara ristanti; siti aminah

Authors

dianara ristanti Department of Mining Engineering, Faculty of Engineering, University of Jember
siti aminah

Keywords:

sistem penyaliran tambang, limpasan, sistem pemompaan, kolam pengendapan

Abstract

An open-pit coal mine in South Kalimantan faces runoff management problems in its disposal area. This study evaluates the existing settling pond capacity and proposes improvements to the mine drainage system. A quantitative approach used rainfall data from 2015–2024, topographic data, pumping and pipeline data, and the existing pond design. Design rainfall was calculated using the Gumbel distribution with a 10-year return period, while runoff discharge was estimated using the Rational Method. The runoff discharge was 1.9695 m³/s, corresponding to a runoff volume of 28,579.724 m³, from a catchment area of 0.57 km² at a rainfall intensity of 17.697 mm/h. The existing settling pond had a capacity of 15,482.376 m³, while pumping capacity was 8,425.4 m³/day. The proposed system comprises three pumps, each operating at 480 m³/h for 20 hours/day, providing 28,800 m³/day. Six additional settling pond compartments increase total storage to 127,692 m³, exceeding the calculated design requirement of 126,000 m³. The proposed configuration is intended to reduce water accumulation in the sump and improve runoff management.

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