Reducing groundwater use and mitigating floods through increasing surface water utilization in the Cimahi Region of West Java Indonesia

Abstract

Population growth and economic development increase the demands for water and land in Indonesia from year to year. In addition, various spatial and temporal changes resulted from human activities in changes in of hydrology of areas around rivers that affect the water's quality and quantity. Groundwater conditions in the Cimahi area, West Java, show a significant groundwater decline in southern Cimahi, a problem that is now studied in this research. This research is conducted by using groundwater modelling from the Experimental Station for Groundwater in the Bandung-Soreang Groundwater Basin, then we further develop the previous model by reducing groundwater utilization and replacing it with surface water to assess the impact of this substitution on the groundwater level, and reduction of surface water runoff for flood mitigation during the modelling projection period 2021 - 2030. The study starts by identifying groundwater utilization in the research area, and then we analyze the feasibility of surface water quality and quantity as a substitute for groundwater utilization. This study concludes that groundwater utilization can be replaced by surface water utilization. Our study results show that surface water runoff can be reduced up to 2.48 m3/s and positively increase groundwater level by 11.26 m.