Utilization of Rainwater Harvesting for Groundwater Conservation in Educational Building

Abstract

This study aims to obtain the optimalization of rainwater harvesting through different technologies, for future groundwater conservation to be used in dry season. This study could demand of human consumption and their activities. The analysis of stormwater run-off volume is used for capacity and quantity of infiltration well. It refers to Standard Depth Calculation from PU (Pekerjaan Umum) of infiltration well. Based on the research results, the infiltration well using porous walls material (permeable wall) with the dimension 1.5x1.5m, permeability coefficient 0,015184 m/hour, rain intensity 0,0115 m/hour, rain duration 60 minutes, the depth of well is 0,889 m. The volume of stormwater in one week with assumming two times rainy days is 4.232 liters. The infiltration well built in the study area was a well with a 2 (two) meters, so that the recharge well discharge obtained 0,216 m3/hour. The excess of stormwater was put into infiltration well is 3,192 liters. If the excess water from rainwater harvesting is accommodated into infiltration wells, must be provided 15 wells with 2 meters depth. If the infiltration couldnot accommodated the excess water, it will flow to city drainage canals. The results of this study are to estimate the potential stormwater volume, the conveyance system and the groundwater conservation system.