Determination Of Subang Groundwater Basin Recharge Area Zoning Are There In The District Of Subang West Java Province
| Main Authors: | Komarudin, Ahmad, Ashari, Yunus, Usman, Dudi Nasrudin |
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| Format: | Article info Qualitative kualitatif application/pdf |
| Bahasa: | ind |
| Terbitan: |
Universitas Islam Bandung
, 2016
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| Subjects: | |
| Online Access: |
http://karyailmiah.unisba.ac.id/index.php/pertambangan/article/view/3052 http://karyailmiah.unisba.ac.id/index.php/pertambangan/article/view/3052/pdf |
Daftar Isi:
- The intensity of groundwater extraction, each year has increased along the various factors that contribute to it. Therefore, the management of the utilization of groundwater resources is an important step in the effort to preserve and maintain the sustainability of the potential of groundwater in the basin in Indonesia, one of which is the Subang Groundwater Basin in Subang district. The study was conducted to determine the hydrogeological conditions, by examining the wells (boreholes and wells) around Subang Groundwater Basin, and determine the zoning of recharge area in Subang Groundwater Basin, with reference to the book Kumpulan Panduan Teknis Pengelolaan Airtanah (PLG, 2007), namely by scoring. From the results of correlation some drill logs, it in found out that in the Subang Groundwater Basin area there are 2 aquifer systems, that is : unconfined aquifer system and semiconfined aquifer system. Data from wells in the unconfined groundwater level flow map, and the map of the known direction of groundwater flow in Subang Groundwater Basin, from the direction of the southern part to the northern part of Subang Groundwater Basin. Likewise with more catchment areas located in the south of Subang Groundwater Basin than central and northern regions of Subang Groundwater Basin. Determination of Subang Groundwater Basin (Anonymous, 2007), based on: 1) passing the rock; 2) rainfall; 3) soil cover; 4) slope; 5) unconfined aquifer flow. Each parameter has a ranking value from 1 to 5. The ranking value assessment is carried out by making a grid of 2.5 cm x 2.5 cm on the Subang Groundwater Basin map, then each grid is ranking value according to the circumstances of each parameter. Then the ranking value of each grid of each parameter included in the recharge value formula. Then the results are colored in accordance with the provisions. From the map classification (Zoning) it could be concluded that in the southern and central part of Subang Groundwater Basin categorized in the Main Recharge Area, and in the northern part of Subang Groundwater Basin categorized in the Additional Recharge Area.
- Penelitian ini dilakukan di Cekungan Airtanah Subang yang ada di wilayah Kabupaten Subang dengan tujuan untuk mengetahui kondisi hidrogeologi, dengan cara meneliti sumur-sumur (sumur bor dan sumur gali) di sekitar CAT Subang, dan menentukan zonasi daerah imbuhan di CAT Subang, dengan mengacu pada buku Kumpulan Panduan Teknis Pengelolaan Airtanah (PLG, 2007), yaitu dengan cara scoring. Hasil korelasi beberapa log bor, didapat bahwa di daerah CAT Subang terdapat 2 sistem akuifer, yaitu sistem akuifer tidak tertekan dan sistem akuifer semi tertekan. Dari data sumur gali di dapat peta aliran airtanah akuifer tidak tertekan, dan dari peta tersebut diketahui arah aliran airtanah yang ada di CAT Subang, yaitu dari arah bagian selatan CAT Subang menuju bagian utara CAT Subang. Begitu juga dengan daerah resapan lebih banyak berada di daerah selatan CAT Subang dibanding daerah tengah dan utara CAT Subang. Penentuan zonasi kawasan imbuhan (Anonim, 2007) didasarkan pada: 1) kelulusan batuan; 2) curah hujan; 3) tanah penutup; 4) kemiringan lereng; 5) muka airtanah tidak tertekan. Masing-masing parameter mempunyai bobot nilai dari bobot nilai 1 sampai bobot nilai 5. Penilaian dilakukan dengan cara membuat grid 2,5 cm x 2,5 cm dari peta CAT Subang skala 1 : 100.000. Selanjutnya masing-masing grid diberi bobot nilai sesuai dengan keadaan dari masing-masing parameter. Bobot nilai dari masing-masing grid dari tiap parameter dimasukkan ke dalam rumus Nilai Imbuhan. Dari peta pengklasifikasian (Zonasi) dapat disimpulkan bahwa di bagian selatan dan bagian tengah CAT Subang termasuk dalam Daerah Imbuhan Utama, dan di bagian utara CAT Subang termasuk ke dalam Daerah Imbuhan Tambahan.