Artificial recharge as an effort to increse urban water resilience

Abstract

The government realizes economic independence with development priorities by increasing food sovereignity and increasing water resilience which is focused on availability, accessibility, sustainability and security. The decrease in groundwater level that occurs in the Bandung Groundwater Basin indicates the occurrence of groundwater extraction that exceeds natural recharge which will threaten water security. The purpose of this study is to calculate the amount of rainwater that can be absorbed into groundwater through artificial recharge. The method used is qualitative descriptive analysis. The results of the field survey showed that shallow groundwater levels in the built area ranged between 2 m - 20 m below groud level, the groundwater level was at a depth of between 15 m - 91 m below groud level. This condition indicates the need for artificial recharge. The area of built area in the Bandung Basin ranged between 92,379.99 Ha. The average rainfall in 2017 is 2164 mm/year, there will be 1,599,282,386.88 m3 of roof water that can be absorbed into the soil to increase the potential of groundwater in the Bandung Basin. If 50% of the roofs of buildings in the built area can be accommodated by roofing water, it will increase the availability of groundwater of 799,641,193.44 m3/year and reducing surface runoff. The successful application of artificial recharges will improve the water resilience of urban areas.