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This model shows the location of potential water aquifer spotted at the study area. A 3D skeleton model view of the groundwater potential aquifer at Block C Sawah Sempadan was created. The resistivity data with x-location of SURFER were later replaced by easting and northing data taken from the topography data using RTK GPS. There were five potential aquifer locations being pointed out at major lines and two at minor lines as on water quantity basis. The data result that obtained show two differences trajectories in Rimba Panjang Village has varying resistivity, namely in the first lane around 1.
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The potential groundwater was acknowledged to be in the sand layer which ranges between 50 to 250 Ωm. The data obtained were processed using Res2Dinv software version 3.54.44. Potential aquifer of resistivity profiles were identified based on comparison of geological log to resistivity survey made at that particular well location. Using the ERT of major and minor lines, one can spot that there are few potential groundwater aquifer located throughout the profiles. While minor line was made from a single survey of 400metre in length perpendicular to major lines at field. This program is used to produce rock’s resistivity map underground by displaying the contrast colour that different its soil resistivity. SURFER software was used to create this major line resistivity profile. Res2Dinv Software Res2Dinv Software is a computer program that automatically determines the 2D resistivity model under ground based on Geoelectrical al survey data. Each major line was formed from 7 surveys of 400 metres in length, which made up to 1.6 km after overlapping at 200 metres. The resistivity profiles of this study consist of three major lines and six minor lines. Wenner-Schlumberger array and a layout of 5 metres electrode spacing for inner and 10 metres for outer cable were employed in all surveys of this study. 2D resistivity survey was conducted to result a resistivity profile or familiarly called electrical resistivity tomography (ERT) which represents the subsurface media using RES2DINV software. In this study, an approach of geophysical technique 2D resistivity survey was applied.
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Thus, identifying potential groundwater that can be extracted to irrigate the paddy field area is crucial. Therefore, an alternative reliable resource of groundwater needs to be investigated with the aim of supplying water continuously over the years. In addition to that, seasonal monsoons also affect the pattern of rainfall which leads to dry and wet season. Even though Malaysia has an annual rainfall around 2600 millimetres, which is above the global average, the distributions of rainfall are uneven which causes certain areas to face limited water supply. Resistivity differences can be attributed to subsurface geology (conductive vs less conductive layers) and hydrogeologic conditions with fresh water exhibiting high resistivity and saline conditions showing low resistivity. Sufficient water supply is a vital process throughout the growth stages in all plants including paddy. The RES2DINV format is a common format used by researchers who work with resistivity data.