Abstract
Majenang Groundwater Basin is located in Cilacap Regency, Central Java. There is an increase of itsusage every year. Because of that, it is necessary to make groundwater zonation to get an overview ofthe potential zonation, specifically in unconfined aquifer. The methods used in this study is measuringwater table, sampling 17 samples of groundwater and pumping test to get the quantity of groundwater.Based on the measurement of known water table, it flows from the side of basin to the center of basin.It has a value of water level between 0.1-4.5 mbgl and water table 33.3-119.9 masl. Pumping test dataprocessing generates characteristic data aquifers, with value of transmisivity (T) is 2.9-11.3 m2/day,hidrolic conductivity (K) is 0.7-4.9 m/day, maximum debit is 2.3-3.6 L/day and optimum debit is 2.0-2.9L/day. Based on the result of quantity data, it has a medium potential zone for the unconfined aquifer.
Highlights
Majenang Groundwater Basin is located in Cilacap Regency, Central Java
It is necessary to make groundwater zonation to get an overview of the potential zonation, in unconfined aquifer
The methods used in this study is measuring water table, sampling 17 samples of groundwater and pumping test to get the quantity of groundwater
Summary
Cekungan airtanah adalah suatu wilayah yang dibatasi oleh batas hidrogeologi dan merupakan tempat semua proses pengimbuhan, pengaliran, dan pelepasan airtanah berlangsung (Peraturan Menteri ESDM No 2 Tahun 2017). Berdasarkan peta tersebut, dapat diketahui bahwa litologi yang terdapat di CAT Majenang didominasi oleh Endapan Aluvium (Qa), Kipas Aluvium (Qf), Formasi Tapak (Tpt), Formasi Halang (Tmph), dan Formasi Kumbang (Tmpk). Proses selanjutnya adalah terbentuknya Endapan Aluvium akibat adanya proses transportasi batuan yang berada di wilayah tinggian dan terbawa oleh arus sungai, sehingga terendapkan di wilayah rendahan cekungan. Daerah penelitian termasuk ke dalam Peta Hidrogeologi Regional Lembar Pekalongan (Tabrani, 1984).CAT Majenang memiliki batas cekungan airtanah berupa batas tanpa aliran.Batas tanpa aliran merupakan batas cekungan yang menunjukan tidak terjadinya aliran airtanah di daerah batas cekungan jika dibandingkan dengan aliran pada akuifer utama.CAT Majenang memiliki tipe batas tanpa aliran eksternal, dimana kontak dari adanya akuifer dan bukan akuifer terjadi pada arah mendatar atau lateral (Bonstra dan de Ridder, 1981 dalam Danaryanto dkk, 2005). Berdasarkan peta hidrogeologi, CAT Majenang memiliki akuifer dengan tipe aliran melalui ruang antar butir, dengan produktivitas tinggi, keterusan sedang-tinggi
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