Study Of Land Cover AND Condition Catchment Area Groundwater Aquifer In Tanah Merah North Samarinda District Using Resistivity Geoelectric Sounding

Abstract

Land cover is a biophysical cover that maintains land conditions in water balance. The purpose of this research is to know the condition of land cover, water catchment, groundwater aquifer and correlation. This research begins by collecting data on land cover, soil type, rainfall, slopes and groundwaterinformation. Field activities include observation and data collection of land cover, geological conditions, community wells and geoelectric sounding. Land cover data is classified according to circumstances and conditions. Geoelectric sounding data was analyzed with IP2WIN software, interpretation of lithologic variation of rocks and depth based on resistivity value. Plot the position of each lithology sounding with Surfer software obtained kontour rock field boundary and 3D model of the aquifer position.The results showed that the land cover consisted of vegetated areas: forests 272,21 Ha (40,32%) and agricultural land 183,36 Ha (27,16%) non-vegetation area: 98,80 Ha (14,64%) constructed land, , Open land 116.33 Ha (17.23%) and water body 4.35 Ha (0.64%) The condition of land cover in this water catchment area has decreased 68,38 Ha (10,14%) from the previous condition 340,59 Ha (50,46%) to 272,21 Ha (40,32%). Referring to Permenhut RI No. 32 in 2009, total score catchment area 33, including the somewhat critical condition. Groundwater aquifers based on 3D sounding geolistrik modeling consist of a free aquifer for shal low groundwater depth of water level between (2-30) m with thickness ± (2-65) m and a distorted aquifer for groundwaterin depth of water between 75-150 m With thickness ± (75125) m, depth of community well ± (10-45) m. The transfer of land into open pit mines resulted in the destruction of the balance and water system, the decreasing / decreasing the discharge of the well water of the community drill, the failure and the lack of new water discharge of the new wells, the loss of groundwaterin several dug wells, landslides and mud floods on the farmland