Analysis of groundwater sufficienty for domestic and livestock requirements as an anticipation to sea water intrusion in Kebumen coast

Ignasius Loyola Setyawan Purnama,Vincentia Anindha Primacintya,Salsabiila Bayu Nugrahaeni,La Ode Saleh Isa,R Che Omar,B White,A Cardenas Tristan,R.F Putri,J.T Sri Sumantyo,D.R Hizbaron,E Haryono

doi:10.1051/e3sconf/202132502008

Abstract

This study has three objectives, i.e calculating the availability of groundwater in the study area, calculating water demand for domestic and livestock and evaluating the safe yield of groundwater extraction. To achieve these three objectives, groundwater availability, safe yield and actual utilization are calculated. Groundwater availability is calculated based on the multiplication of the area, aquifer thickness and the specific yield. Water demand for domestic is determined base on the number of population and the amount of water demand of each person in each day. Water demand for livestock is calculated based on the number of livestock and water consumption for each livestock in each day, while the safe yield is calculated based on the multiplication of area, annual groundwater level fluctuation and specific yield. The results of research showed that the availability of groundwater in the study area reached 440,517,770 m3/year, while the safe yield for its extraction was 76,641,600 m3/year. Because the water demand for domestic and livestock is 6,495,100 m3/year, so that the availability of groundwater in the study area is still sufficient to support water demand for these sectors. The water demand of the two sectors still have not exceeded the safe yield water extraction, so it will not cause decreasing of groundwater pressure which can cause to sea water intrusion.

Highlights

Even though water is only composed of two atoms, namely H and O, water is the main source of life needed for all human activities such as domestic, agricultural, livestock and industrial requirement [1]
This study aims to calculate groundwater availability, to calculate water demand for domestic and livestock and to analyze the safe yield of groundwater extraction in the study area so that seawater intrusion does not occur
2.1 Calculation of water availability Groundwater availability is calculated using a static approach using the formula: Vat = Sy x Vak where Vat is the volume of groundwater that can be extracted from the aquifer, Sy is the specific yield or percentage of water that can be released from the aquifer and Vak is the volume of the aquifer, which is the area of the district multiplied by the thickness of the aquifer

Summary

Introduction

Even though water is only composed of two atoms, namely H and O, water is the main source of life needed for all human activities such as domestic, agricultural, livestock and industrial requirement [1]. Until now groundwater is still the main source of water in various regions, especially for non-agricultural activities such as for domestic, industrial and livestock needs [4,5]. The high exploitation of groundwater, if it does not cause land subsidence, can cause sea water intrusion. This second impact is more frequent, so it has become a serious problem in cities located in coastal areas [6,7,8,9,10,11,12]. Some of the other water will be lost from aquifers in various ways

Objectives

Methods

Conclusion