Identification of Groundwater Potential Based on Remote Sensing and Geographic Information Systems in The City of Padang

Abstract

Water is a basic need for living creatures, including humans. The need for water can be obtained from various sources, including: rainwater, surface water, or groundwater. The estimated quantity and distribution of water on earth is 97% of the water on earth is in the sea and the remaining 1.7% is at the earth's poles in the form of ice, 1.7% is underground water and only 0.1% is as water. surface and atmosphere. Padang City still lacks clean water, because Padang City PDAM water often experiences problems. So many people use drilled wells or dug wells. Therefore, it is very necessary to identify groundwater in Padang City. Identification of Padang City's groundwater potential in this research uses Remote Sensing data and Geographic Information Systems. The Geographic Information System application is used to identify groundwater potential through overlaying a tiered quantitative method on the parameters of vegetation density, land cover, soil texture, rock type, rainfall and slope to obtain the distribution of groundwater potential. The results of this research are that the groundwater potential in Padang City consists of several classes, namely no potential, low, medium and high. Groundwater potential in Padang City is dominated by low groundwater potential covering an area of 37,369,903 Ha, medium area covering an area of 25,159,745 Ha, high potential covering an area of 7,493.06 Ha and no potential area covering an area of 113,030 Ha. Based on validation using data from 59 drilled wells in Padang City which was overlaid with a groundwater potential map for Padang City, it was found that 11 (18.65%) drilled wells were not suitable and 48 (81.35%) drilled wells were suitable.