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Imbuhan Airtanah Buatan untuk Konservasi Cekungan Airtanah Bandung-Soreang Ananta Purwoarminta; Rachmat Fajar Lubis; Rizka Maria
JURNAL RISET GEOLOGI DAN PERTAMBANGAN Vol 29, No 1 (2019)
Publisher : Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3733.722 KB) | DOI: 10.14203/risetgeotam2019.v29.1004

Abstract

Airtanah saat ini telah menjadi isu di dunia dan Indonesia akibat terjadinya degradasi airtanah. Tingginya pertumbuhan penduduk dan industri di wilayah kota telah meningkatkan eksploitasi airtanah, sementara laju pengisian airtanah (infiltrasi) terus menurun. Penurunan laju infiltrasi diakibatkan oleh adanya perubahan tutupan lahan. Berdasarkan permasalahan ini maka konservasi airtanah harus dilakukan untuk menjaga ketahanan air. Cekungan Bandung-Soreang sebagai wilayah perkotaan telah mengalami penurunan muka airtanah sebagai akibat adanya pengambilan airtanah yang berlebih. Tulisan ini adalah telaah dari berbagai metode teknis yang telah diterapkan untuk mengatasi masalah tersebut di atas khususnya metode imbuhan buatan untuk konservasi airtanah di Cekungan Bandung. Berbagai teknik telah diterapkan baik oleh masyarakat, industri maupun pemerintah dengan sumber utama adalah air hujan. Namun penurunan muka airtanah masih terus terjadi meskipun upaya-upaya tersebut telah dilakukan. Hasil penelitian terakhir menunjukkan bahwa metode imbuhan buatan hanya mampu mengurangi penurunan muka airtanah. Jika hasil yang diharapkan adalah kembalinya muka airtanah ke kondisi awal maka diperlukan pengembangan metode dan atau penambahan jumlah imbuhan buatan yang sangat banyak. Groundwater becomes an issue globally due to groundwater degradation. The high population and industry growth in the cities had increased the exploitation of groundwater. On the other hand, the rate of infiltration is lower due to city development. Therefore, groundwater conservation is required to maintain water resistance. The Bandung-Soreang Basin, as an urban area, has experienced a decline in groundwater as a result of excessive groundwater extraction. This paper presented a review of various technical methods that have been applied to overcome the problem. Artificial recharge method for groundwater conservation in the Bandung-Soreang Basin has been used by the community, industry, and government, with rainwater as the main source. The most recent condition indicated that the groundwater level has been still decreasing despite these efforts. The results of the latest research suggested that artificial recharge has only  reduced the groundwater depletion. To restore the groundwater to its initial condition, we need to develop a new method or simply add a lot more artificial recharges.
Hidrokimia Mata Air Karst untuk Irigasi Studi Kasus Desa Ligarmukti, Kabupaten Bogor Rizka Maria; Ananta Purwoarminta; Rachmat Fajar Lubis
Jurnal Irigasi Vol 13, No 1 (2018): Jurnal Irigasi
Publisher : Balai Teknik Irigasi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1464.316 KB) | DOI: 10.31028/ji.v13.i1.1-10

Abstract

Ligarmukti Village in Bogor Regency is a karst hilly area that is rich in springs so that it can supply water for domestic and agricultural purposes. The chemical properties of water derived from limestone have their own characteristics which probably have an impact on the quality of agricultural products. Thus, this study was conducted to analyze the hydrochemical properties of karst springs for irrigation. Research methods were secondary data inventory, hydrogeological observation, and laboratory analysis. Sodong is the largest spring with a discharge of 314.42 l/s in the rainy season and 154.38 l/s in the dry season. Rice field area is approximately 300 ha. The discharge from the spring can irrigate rice fields covering an area of 314.14 ha in the rainy season and 154.38 ha in the dry season. In addition to discharge, water chemical factors also determine agricultural yields. Groundwater hydrochemical including Ca-HCO3 facies, groundwater flow systems are controlled by autogenic recharge which shows the type of water in the spring from rainwater directly infiltrated in the area. Classification of water for irrigation including C2-S1 type which shows that spring has good water quality, a risk of medium salinity, and low sodium risk. The results of this study can be used by the government to maintain the village of Ligarmukti as an agricultural granary.