Geoelectrical Investigation the Depth of Groundwater Potential for Irrigation of Paddy Fields

Abstract

Abstract Groundwater is an opportunity for the irrigation of Paddy fields. A paddy field that is planted only one crop during the rainy season is an obstacle to the lack of rice production in the city of Padang. Meeting the need for rice consumption was sent from various western Sumatra areas. If this happens, again and again, it would threaten food security. This research to determine the depth of groundwater table potential has been carried out in Koto Tangah, Padang city. This study using the geoelectric resistivity method with Schlumberger Configuration and data processing using software IP2WIN. The resistivities value of these zones varies from 1.8 Ωm to 1761 Ωm. Layers found to the depth 20 m are a sub-surface layer, clay, sandy clay, and gravel. Layers of clay identified as Groundwater because it’s small so it can withstand water. Based on the results of comparative research data measurement of the estimation of the depth of the ground water level with a geoelectric tool and the depth of the ground water with a piezometer device obtained close relationship. So, from these results a linear regression equation can be made with the form of the equation Ý = 0.793X + 0.838X + 0.3636 and has an R2 of 0.8765.