Subsurface Mapping of Ground Water using Schlumberger Configuration in Upstream of Brantas River, Batu area, East Java, Indonesia

Adi Susilo

doi:10.21776/ub.natural-b.2014.002.04.1

Abstract

A Resistivity sounding survey of groundwater was performed around the upstream of Brantas river, Batu area, East Java, Indonesia. The goal of this study is to identify the water resources. In order to determine the aquifer thickness and the ground water flow, it was done a mapping in the 6-spring water area, as a representative of 108 spring water in the study area. Acquisitions are taken by six lines using Schlumberger configuration around the spring water at length of measurement line about 400 m with electrode spacing 10 m. Data processing and interpretation were using IP2WIN, Progress 3, and Rockwork 15, which allowed in 1D and 3D scheme to present the distribution of real resistivity below the surface. Interpretation of the results indicate the presence of a layer of rock that is formed due to volcanic activity. The rock structure is composed of volcanic rock breccia, tuff breccia, sandy tuff, tuff and lava. Rocks of volcanic breccia, tuff breccia, tuff and lava have small porosity due to having a small grain size and smooth, and have the low permeability, so it is not able to store and drain water. This rock layer is expected to function as an impermeable layer and can further serve to hold water that can seep into the ground below, so that the ground water will flow horizontally. While sandstone has a great porosity because it has a rounded rock grains with large permeability, so as to save water and running it in a number of significant.

Highlights

Water is one of the basic needs for human life, availability of water that meets the quality requirements in accordance with the standard requirements, the quantity is sufficient and available at any time
In getting information below the surface such as resistivity with depth in around the upstream of Brantas river, we investigated the area using geoelectrical method especially using geolectrical sounding (Schlumberger configuration)
The study area is located at coordinates between 1120 28’ 13’’

Summary

Introduction

Water is one of the basic needs for human life, availability of water that meets the quality requirements in accordance with the standard requirements, the quantity is sufficient and available at any time (continuous). The quality and quantity of water is strongly influenced by climate change in the local area [1]. The government of East Java tried to conserve the water resources intensively. The locations as the center of water resources conservation in East Java is Upstream of Brantas River in Batu city. Batu City has sufficient water resources in terms of quantity large with good water quality conditions. The Batu city have high potential of the ground water. In the Batu city there are 108 spring water and spread in all the city area (Figure). Large springs debit namely Binangun spring water in Bumiaji, Dok spring water in Junrejo, Pande spring water in

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Results