Water availability model based on system dynamic: Sadar sub-watershed case study

Abstract

Sadar Sub-watershed is one of 32 Brantas sub-watersheds located in the southern part of Mojokerto district and parts of the city of Mojokerto. Based on government regulation (PP) No 26 of 2008, Mojokerto is one of the national strategic areas from the point of view of economic interests. The National Strategic Area (KSN) with an economic interest point of view has an important role for national development, because these areas have the potential for a fast-growing economy and a leading sector capable of driving the national economy. This economic growth must be supported by the availability of various supporting facilities, one of which is the provision of clean water. The current condition of the existence of clean water is decreasing due to various reasons. The purpose of this research is to predict the availability of water in the future as a basis a water resources planning. The stages of the research are as follows: (1). Secondary data collection in the study. The data is used to calculate current water availability and predict future water availability. Primary data is in the form of interviews with groundwater users and experts. (2) Data Analysis. (3) Build the model of water availability in the study area. (4) Simulation of water availability in the study area under various scenario (5). Model validation. The results of this study indicate that there is an effect of land-use change on water availability in the sub-basin. Water conservation scenarios can maintain water availability in the future.