Safe Yield of Groundwater Utilization for Domestic, Livestock and Hotels Requirement as An Anticipation of Sea Water Intrusion in The Coastal of Batang Regency

Abstract

As a result of the groundwater utilization which exceeds its safe yield, the phenomenon of seawater intrusion is often found in some coastal areas. For this reason, the utilization of groundwater must not exceed its safe yield. This study aims to calculate the availability of groundwater and its safe yield and evaluate its utilization which does not exceed the safe yield. To achieve this purposes, groundwater availability is calculated using the static method by multiplying the area by the thickness of the aquifer and the specific yield. Utilization of groundwater for domestic, livestock and hotel requirement is carried out by multiplying the water demand for each of these sectors by the amount. Safe yield is calculated based on area width, groundwater fluctuation and its specific yield. The groundwater resources potential of research area amounted to 648,960,234 m3/year, while the safe yield was 127,702,334 m3/year. Utilization of groundwater for domestic, livestock and hotel requirement is 23,062,023 m3/year, so that the use of groundwater to meet domestic, livestock and hotel reqirement has not endangered the availability of groundwater. However, for Batang District, groundwater utilization has almost reached half of its safe yield.