The impact of earthquake on clean water demand and supply at North Lombok regency, Indonesia

Abstract

An earthquake of magnitude 6.4 Mw hit Lombok, Indonesia in July 2018, followed by another 6.9 Mw earthquake magnitude in less than a month in August 2018. The earthquake caused fatalities and damage to infrastructures, including the facilities of clean water. The main objective of this study is to know the impact of the earthquake towards clean water facilities damage, and to analyse clean water demand and supply after earthquakes in North Lombok Regency. Another purpose is to propose disaster mitigation to be implemented in the other disaster prone regions of Indonesia. The primary data were collected through field survey and questionnaire samples of 110 respondents. Secondary data regarding the damage of clean water network were collected from the Regional Water Company (PDAM) of North Lombok. The results of this study show that many clean water facilities were damaged due to earthquake. The amount of clean water demand in Lombok Island after the earthquake was decreased by 19.03%. The number of wells users after the earthquake increased from 22.73% to 57.27%. The potential groundwater for clean water in the Lombok Island is more than sufficient to fulfil the requirement of clean water during disaster. However, further studies are required to realize such idea.