Abstract
Water drought become serious problem during dry season for rice field at Alor Gajah, Melaka, Malaysia. Electrical Resistivity Imaging (ERI) surveys have been conducted in order to locate and delineate groundwater resources by distribution of subsurface resistivity. The survey of ERI was carried out using ABEM Terrameter SAS 400 and ABEM Selector ES10-64 with pole-dipole configuration of electrode. At the same time, Induced Polarization (IP) survey also carried out to support the result of ERI. There are three line profiles with 400 m length and 5 m electrode spacing named PS1, KRBG2 and BB3. From three line profiles, two of them show that the distribution of low resistivity value (20 – 500 Ωm) are located at depth ranging from 20 to 70 m. The low resistivity values are associated with water saturated zone. This result was supported by IP’s results that show at that particular depth the value of chargeability ranging 0 to 4 ms. Meanwhile, line profile BB3 indicate low resistivity value (0.5 – 500 Ωm) but the chargeability value are high (10 – 75 ms) interpreted as clay layer.
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