Analysis of groundwater vulnerability in coal mining at Tanah Laut District, South Kalimantan

Abstract

A mining plan will affect the water catchment especially on the availability of groundwater. One effort to maintain the quantity and quality of groundwater is analyze the level of groundwater vulnerability. The aim of this research is finding areas that potentially have pollution of groundwater. The analytical method using DRASTIC method. DRASTIC have seven parameters: depth of groundwater (D), recharge (R), aquifer type (A), soil texture (S), topography (T), impact of the vadose zone (I), and hydraulic conductivity (C). DRASTIC divides each parameter into several classes according to rating, and weight based on their effect of groundwater vulnerability. The final results of this study are a map of groundwater vulnerability level using ArcGIS software. The study area has 2,5% area with very low vulnerability, 75% low, 20% moderate and 2,5% high. Groundwater vulnerability maps can be a guidance for area of mining plan, in order to minimize the negative effects of mining activities.