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The determination of recharge areas needs to support the groundwater conservation in the southern volcanic Bandung area. This study aims to determine the recharge area based on environmental isotopes and hydrochemical. A sampling of 26 groundwater was carried out at springs, dug wells, and drilling wells. The variation in groundwater chemistry principally is controlled by a combination of ion exchange, silicate weathering, calcite, and dolomite dissolution of minerals. The hydrochemical facies were CaCl, CaMgCl, CaMgHCO3, CaHCO3, and NaKHCO3. The CaHCO3 facies describe moderate groundwater flows. The NaKHCO3 facies shows the mixing of shallow and deep groundwater. The recharge area in the central, proximal, and medial facies zone consists of 3 groups. Group I is considered water originating from local rainwater infiltration; Group II is considered the infiltration elevation which ranges from 980–1230 m asl; Group III estimated to be derived from the recharge elevation between 750–970 m asl, Group IV are more likely to show symptoms of evaporation or interaction with surface water. The discharge area is characterized by less active groundwater circulation, with dominant HCO3– and TDS value in the distal facies zone. Hydrochemical variation helped the identification of recharge areas in the volcanic facies.

This paper evaluates environmental conditions responsible for the high concentrations of trace metals in Indonesian coastal groundwater. Indramayu, which has significant potential groundwater resources, but for which limited information is available regarding its vulnerability, is selected as our study area. Results show that Fe2+ and Mn2+ are natural contaminants in the groundwater of the study site. The correlations of trace metals with salinity and redox-sensitive parameters verify that saline water has a significant impact upon the dissolution of Fe and Mn. Furthermore, reductive condition is confirmed to be responsible for Fe and Mn dissolution with a less significant correlation compared to salinity. Moreover, the high concentrations of trace metals are coupled with high dissolved organic carbon (DOC), which indicates that reductive environment may arise because of organic-matter decomposition. Finally, the impact of human activity upon Fe and Mn dissolution is identified at the northern tip of Indramayu, where trace-metal contents are significantly elevated. Further, in the southern part, the groundwater condition is relatively more natural; thus, the impact of human activity upon the presence of Fe and Mn is lesser in this region.

Fenomena alih fungsi lahan hutan dan pertanian menjadi kawasan permukiman, industri dan wisata (kawasan terbangun) di wilayah pengembangan Jalancagak Kabupaten Subang dari tahun ke tahun relatif cepat. Kecenderungan degradasi lahan akibat perubahan penggunaan lahan akan terus berlangsung dan sangat perlu mendapat perhatian dikarenakan wilayah ini termasuk ke dalam kawasan resapan air. Kajian kesesuaian lahan berdasarkan perhitungan indeks konservasi telah dilakukan. Indeks konservasi menunjukkan kemampuan suatu wilayah untuk menyerap air hujan yang jatuh kepermukaan tanah dan menjadi imbuhan air tanah yang dihitung berdasarkan variabel kemiringan lereng, jenis batuan, jenis tanah, curah hujan, dan penggunaan lahan.Penilaian kesesuaian lahan berdasarkan nilai indeks konservasi dilakukan pada tahun 2009, 2014 dan RTRW tahun 2030. Hasilanalisis menunjukkan skenario penggunaan lahan RTRW tahun 2030 mampu mengurangi lahan-lahan yang dikategorikan kritis di wilayah Sub DAS Ciasem hulu dibandingkan dengan tahun 2009 dan 2014. Kata kunci : indeks konservasi, penggunaan  lahan, wilayah pengembangan

Indonesian coastal alluvial plain has a large groundwater storage capacity. However, human perturbation to the groundwater environment has resulted in groundwater contamination. Nitrogen species are parameter those usually detected in Indonesian coastal groundwater. The main objective of this study was to evaluate the possible sources of ammonium (NH4+-N), as one form of nitrogen species, using both chemical properties and geographic information. The study site was Indramayu, a developing rural area located in the northern part of West Java. In August 2017, 20 groundwater and river water samples were collected from sites representative of various types of land-use. The chloride (Cl-) concentration in the samples ranged from 15 mg/L to 12,000 mg/L. Most of the locations represented fresh-brackish to brackish-salt water conditions, indicating the influence of seawater on the groundwater samples. Furthermore, analysis of several nitrogen species identified high NH4+-N concentrations in the samples. Based on the relationship between Cl- and NH4+-N, samples were clustered into three groups. The first and second groups exhibited linear correlations, while in the third group, no relationship between these two parameters was identified. The land-use associated with each group was then evaluated. The main NH4+-N source in the first group was identified as organic sediment, where NH4+-N may be released through ion exchange with sodium, facilitated by the high salinity conditions. The source of NH4+-N in the second group was suggested to be a combination of sediment, fertilizer, and human and animal waste. Finally, it was hypothesized that the source of NH4+ in the third group is mainly human waste.

The Ligarmukti area is one part of the Klapanunggal karst hills in Bogor Regency. This area relies on springs as the fulfillment of raw water. It is feared that the limestone mining process in this area will damage groundwater recharge areas. This research was conducted to determine groundwater catchment areas in the Ligarmukti karst area. The method used is the morphological lineament delineation analysis of SRTM imagery compiled with the results of investigations in the field. Based on the results of delineation, the SRTM image was able to detect 76 alignment patterns in the direction of N 28° - 235° E. The fracture location was mostly located at elevation 280 - 700 m. The difference in direction of the alignment pattern is not too far away, so it is interpreted that the groundwater recharge pattern in the secondary porosity is derived from an aquifer system. The main catchment zone is at an altitude of 440-700 m above sea level in the hills with limestone constituent Klapanunggal Formation. The infiltration system in this area is an autogenic recharge, ie the recharge occurs in areas with relatively homogeneous rocks in the form of karst rocks and rainwater which is directly infiltrated in the area. This condition can be seen from the fluctuation of discharge during the rainy and dry seasons. Watershed conservation must be carried out to maintain the availability of springs by minimizing the limestone mining process in hilly areas.

Proses hidrogeokimia terjadi karena interaksi antara airtanah dengan air laut. Proses tersebut akan mempengaruhi komposisi kimia di lingkungan pesisir. Untuk mengetahui seberapa jauh interaksi tersebut telah terjadi, dilakukan analisis tipe air berdasarkan jumlah anion dan kation yang paling dominan, dan analisis nisbah ion-ion utama. Pengambilan conto dilakukan di 38 lokasi conto air di pesisir barat Kabupaten Serang dan Pandeglang. Hasil penelitian menunjukkan tipe air didominasi oleh Ca(HCO 3 ) 2 55,26%, NaHCO 3 39,47%, Ca(SO 4 ) 2 2,63% and NaMix 2,63%. Sementara hasil analisis nisbah ion utama Na + /Cl - , Ca 2+ /Mg 2+ , dan Ca 2+ /SO 4 2- mengindikasikan bahwa telah terjadi pencemaran air laut di beberapa dataran alluvial pesisir Pandeglang. Pada sebagian besar pesisir barat Serang dan Pandeglang sedang terjadi proses pencemaran atau intrusi air laut. Occurrence of hydrogeochemical process is due to the interaction between groundwater and sea water. The process will affect the chemical composition in the coastal environment. To find out how far the interaction has taken place, the water type was analysed based on the amount of most dominant anion and cation, and also the major ions ratios. The samplings were conducted in 38 locations on the west coast of Serang and Pandeglang Regencies. Results showed that the water type was dominated by Ca(HCO 3 ) 2 55,26%, NaHCO 3 39,47%, Ca(SO 4 ) 2 2,63% and NaMix 2,63%. While the results of major ion analysis of Na + /Cl - , Ca 2+ /Mg 2+ , and Ca 2+ /SO 4 2- indicated that there has been the sea water pollution in some coastal alluvial plains of Pandeglang. In addition, the process of pollution or sea water intrusion has been occurring on most of the west coast of Serang and Pandeglang.

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.

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 a n 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 hydrochemi cal including Ca-HCO 3 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.

Potensi airtanah pada suatu cekungan tidak terlepas dari kondisi hidrogeologi di wilayah itu sendiri. Cekungan airtanah Indramayu, yang berada di pesisir utara Jawa Barat, hingga kini belum diketahui secara pasti potensi cadangannya. Penelitian ini bertujuan untuk mengetahui potensi cadangan air tanah berdasarkan rekonstruksi hidrogeologi data bor. Hasil interpretasi hidrogeologi menunjukkan bahwa litologi akuifer didominasi oleh endapan lempung dengan sisipan lanau, sedikit pasir halus di bagian atas, endapan lempung marin dengan sisipan lanau, dan pasir halus di bagian bawah. Hasil perhitungan menunjukkan prediksi cadangan airtanah yang cukup potensial. Nilai rata – rata potensi airtanah bebas adalah 65.213,8 m 3 /hari atau 0,754 m 3 /det. Nilai rata – rata potensi airtanah tertekan adalah 79.557,1 m 3 /hari atau 0,920 m 3 /det. Tetapi kualitas airtanah di wilayah Losarang – Lobener – Pasekan – Sindang sebagian besar payau dan memiliki nilai DHL yang tinggi, berkisar antara 4710 – 11400 µs/cm. The groundwater potential of a basin depends on the hydrogeology of the area. Indramayu groundwater basin is located at the north coast of Java Island. Its reserves potential was not identified despite its importance. The objective of this research was to understand the potential of groundwater reserves based on hydrogeological reconstruction from drilling data analysis. The results of the hydrogeology interpretation had indicated that the aquifers lithology are dominated by clay deposits with silt layering, slightly fine sand at the top, marine clay deposits with silt inserts, and fine sand at the bottom. The calculation results had indicated a good potential of groundwater reserves. The mean value of the unconfined groundwater is 65,213.8 m 3 /day or 0.754 m 3 /sec. The mean value of the confined groundwater is 79,557.1 m 3 /day or 0.920 m 3 /sec. However, groundwater supply potential is not supported by the quality. The groundwater in Losarang - Lobener – Pasekan-Sindang area is brackish and has a high DHL value (4710 – 11400 µs/cm).

Dense settlements have an impact on pollution, one of which is domestic pollution which results in groundwater and soil water pollution at ground level. Identification of pollution that occurs below the soil surface (groundwater contamination) is more difficult to detect, so modeling is needed to find out how the rate of groundwater pollution rate. Modeling is done by using water sampling method at dug well at location adjacent to septic tank. Sampling ground water and infiltration modeling is done by using Geostudio SEEP/W software. The research area is in Margahayu village, Bandung regency. The results of laboratory analysis and physical observation in the field show that the Margahayu region has ammonium (NH4-N) content which is above the standard quality threshold. This condition is reinforced by modeling simulation results that there has been domestic sewage from septic tanks to dug wells. Pollution has reached groundwater level with depth ranged between 4-5 meters. The distance of wells adjacent to the septic tanks affects the quality of groundwater. In the KB area 17 it is indicated that the contamination in the residents' wells in harike-3i, KB new on the 32-40 day time frame, and KB new 2 on the 24th day. Distance sources of contaminants and soil permeability play an important role in determining the travel time of contaminants.

Kemajuan pembangunan di wilayah sub urban Bandung Selatan menimbulkan beberapa implikasi. Pembangunan permukiman yang kurang terencana dan sistem sanitasi yang tidak memenuhi syarat berakibat pada perubahan kondisi air tanah baik kuantitas maupun kualitas. Penurunan kualitas air tanah ditandai dengan terdeteksinya beberapa polutan diantaranya nitrat, nitrit dan amonia yang berhubungan dengan kegiatan manusia seperti pembuangan limbah domestik, hasil aktivitas peternakan dan penggunaan pupuk yang berlebihan. Tujuan dari penelitian inii untuk mengetahui degradasi kualitas air tanah bebas di daerah sub urban Bandung Selatan. Metode yang digunakan adalah analisis spasial polutan pada air tanah bebas dengan Sistem Informasi geografis (SIG). Analisis kandungan polutan pada air tanah memberikan hasil yang sangat beragam; konsentrasi nitrat (NO3-N) 1,03 – 38, 01 mg/l, nitrit (NO2-N) 4-N) 0.015 – 18.76 mg/l. Perbedaan konsentrasi sebaran kontaminan terdapat pada daerah perbukitan dan dataran. Pada daerah dataran mempunyai nilai kadar nitrit dan amoniak yang tinggi, sedangkan di daerah perbukitan memiliki kadar konsentrasi nitrat tinggi. Diari hasil penelitian dapat disimpulkan bahwa kehadiran polutan dalam air tanah disebabkan oleh pengaruh antropogenik seperti sanitasi atau sistem pembuangan limbah yang kurang baik.Kata Kunci : analisis spasial, degradasi air tanah, antropogenik

Kawasan karst Klapanunggal mempunyai sistem hidrogeologi yang unik dengan potensi mata air dan sungai bawah permukaan. Seperti umumnya wilayah karst, daerah ini mempunyai permasalahan pemenuhan air bersih terutama pada musim kemarau. Perbedaan topografi antara mata air dan sebaran pemukiman menjadi salah satu faktor penghambat penyaluran sumber air. Pemilihan sumber mata air adalah bagian terpenting dalam perencanaan pembangunan jaringan air bersih untuk karst. Secara umum terdapat beberapa kriteria terpenting dalam pemilihan sumber mata air diantaranya debit air (kuantitas), kontinuitas ketersediaan air, dan kualitas air. Tujuan dari penelitian ini adalah menentukan jaringan air bersih dari mata air untuk mendukung ketahanan sumber daya air di wilayah karst. Metode yang dilakukan adalah dengan wawancara, Focus Group Discussion (FGD), dan analisis proses hirarki (AHP) untuk pemilihan sumber mata air yang melibatkan banyak kriteria dan alternatif pilihan. Hasil penelitian menunjukkan bahwa mata air Sodong menjadi pilihan utama sebagai penyuplai jaringan air bersih di wilayah Ligarmukti Klapanunggal. Mata air ini memiliki debit besar dan kontinuitas debit pada musim hujan maupun kemarau. Mata air ini juga digunakan sebagai penyuplai air bersih hingga Kecamatan Cileungsi. Selain itu juga didukung mata air dengan debit kecil yang dapat menjangkau seluruh wilayah pedesaan. Hasil penelitian ini dapat digunakan sebagai pendukung dalam pemilihan lokasi sumber mata air untuk mendukung ketahanan air di kawasan karst Klapanunggal.Kata kunci: karst, mata air, ketahanan air

Pollution of groundwater is a primary issue because aquifers are susceptible to contamination from land use and anthropogenic impacts. Groundwater susceptibility is intrinsic and specific. Intrinsic vulnerability refers to an aquifer that is susceptible to pollution and to the geological and hydrogeological features. Vulnerability assessment is an essential step in assessing groundwater contamination. This approach provides a visual analysis for helping planners and decision makers to achieve the sustainable management of water resources. Comparative studies are applying different methodologies to result in the basic evaluation of the groundwater vulnerability. Based on the comparison of methods, there are several advantages and disadvantages. SI can be overlaid on DRASTIC and Pesticide DRASTIC to extract the divergence in sensitivity. DRASTIC identifies low susceptibility and underestimates the pollution risk while Pesticide DRASTIC and SI represents better risk and is recommended for the future. SINTACS method generates very high vulnerability zones with surface waters and aquifer interactions. GOD method could be adequate for vulnerability mapping in karstified carbonate aquifers at small–moderate scales, and EPIK method can be used for large scale. GOD method is suitable for designing large area such as land management while DRASTIC has good accuracy and more real use in geoenvironmental detailed studies.

Drainage basin/watershed analysis based on morphometric parameters is very important for watershed planning. Morphometric analysis of watershed is the best method to identify the relationship of various aspects in the area. Despite many technical papers were dealt with in this area of study, there is no particular standard classification and implication of each parameter. It is very confusing to evaluate a value of every morphometric parameter. This paper deals with the meaning of values of the various morphometric parameters, with adequate contextual information. A critical review is presented on each classification, the range of values, and their implications. Besides classification and its impact, the authors also concern about the quality of input data, either in data preparation or scale/the detail level of mapping. This review paper hopefully can give a comprehensive explanation to assist the upcoming research dealing with morphometric analysis.

Cikapundung sub-watershed is a potential area that serves as the main drainage and supply of residents water need in Bandung. Increased developed land in this region resulted in the conversion of land that extends the number of impermeable surface, that reduces infiltration, decreasing supply and rising groundwater runoff. To determine the effect of landuse on the function of the groundwater conservation, conservation index analysis was conducted. The method is to give weight to the parameters of rock types, soil types, morphology, rainfall and landuse. Each parameter has a value of its effect on the ability to absorb rain water. From the analysis, it is known that changes in landuse during the period 2001 - 2008 has lowered the overall conservation function at Cikapundung sub watershed. Conservation value of the function started to decline as shown by the reduction of good conservation area of 5080,5 h. However, this condition was also followed by the increase of the normal conservation classes of 5093,3 ha and critical conservation area of 12,9 ha. ABSTRAK Sub DAS Cikapundung merupakan kawasan potensial yang berfungsi sebagai drainase utama dan penyedia air baku untuk kebutuhan penduduk di Kota Bandung. Peningkatan lahan terbangun di wilayah ini mengakibatkan banyaknya konversi lahan yang memperluas permukaan kedap air yang menyebabkan berkurangnya infiltrasi, menurunnya pasokan airtanah dan meningkatnya limpasan permukaan. Untuk mengetahui pengaruh penggunaan lahan terhadap fungsi konservasi airtanah maka dilakukan analisis indeks konservasi. Metode yang dilakukan adalah memberikan bobot pada parameter jenis batuan, jenis tanah, morfologi, curah hujan dan penggunaan lahan yang masing-masing telah di nilai sesuai pengaruhnya pada kemampuan untuk menyerap air hujan. Dari analisis tersebut diketahui bahwa perubahan penggunaan lahan pada kurun waktu 2001 - 2008 telah menurunkan fungsi konservasi secara keseluruhan pada Sub DAS Cikapundung. Nilai fungsi konservasi mulai menurun ditunjukkan oleh pengurangan kelas yang bernilai konservasi baik seluas 5080,5 ha. Namun kondisi ini juga diikuti dengan kenaikan kelas konservasi normal seluas 5093,3 ha dan penurunan kelas konservasi kritis seluas 12,9 ha.

Studi karakteristik curah hujan di WPS Ciliwung-Cisadane dilakukan untuk menyediakan informasi dasar bagi mitigasi bencana yang berhubungan dengan air. Karakteristik hujan yang dipelajari meliputi distribusi spasial dan temporal curah hujan bulanan, lama dan intensitas hujan. Distribusi hujan disusun dengan menggunakan metode isohyet. Data dasar yang digunakan adalah data curah hujan harian dari 13 stasiun hujan di daerah kajian untuk periode 1997 – 2006. Variabilitas fenomena iklim global (ENSO dan Dipole Mode) ternyata mempengaruhi jumlah curah dan distribusi temporal hujan di WPS Ciliwung-Cisadane. Interaksi anomali ENSO dan IOD yang kuat dapat menjadi penyebab terjadinya banjir di Jakarta. Tetapi banjir juga terjadi ketika indeks ENSO dan Dipole Mode menunjukkan keadaan normal, yang menunjukkan adanya faktor-faktor lain yang dapat menjadi penyebab banjir di Jakarta. Hujan intensitas rendah dengan waktu panjang yang sering terjadi pada bulan basah perlu diwaspadai karena hujan dengan karakter ini berpotensi menjadi penyebab bencana banjir dan longsor. Pada bulan kering, dominan terjadi hujan dengan intensitas yang lebih tinggi dengan durasi lebih singkat.

DAS Cikapundung adalah salah satu bagian dari sub DAS Citarum dan merupakan sungai yang berfungsi sebagai drainase utama di pusat kota Bandung. Hingga saat ini sub DAS Cikapundung masih sangat potensial bagi penyediaan air baku untuk kebutuhan penduduk, namun kini debit bulanannya telah menurun hingga 20-30% dari debit normal. Kondisi Hidrogeologi di daerah penelitian menunjukkan sistem air tanah di daerah penelitian merupakan sitem air tanah bebas dan sebagian kecil sistem air tanah setengah tertekan. Litologi penyusun akuifer pada daerah penelitian berupa breksi vulkanik dan batu pasir tufaan. Akuifer yang terdapat pada daerah penelitian diduga bukan merupakan aquifer yang potensial. Berdasarkan hasil penelitian maka daerah resapan alamiah ditinjau dari kondisi tanah, kemiringan lereng, litologi, dan daerah luahan memiliki luas 6 juta m 2 , atau 36% dari total luas daerah penelitian. Jumlah air yang menjadi cadangan air tanah berdasarkan perhitungan neraca air adalah sebesar 4,3 juta m 3 /tahun atau 12% dari total curah hujan yang masuk, dan sebesar 6,2 juta m 3 /tahun jika di asumsikan daerah penelitan berada pada kondisi alamiahnya. Hal ini menunjukkan luas daerah resapan air tanah yang ada sekarang sudah mengalami perubahan. Jumlah air yang meresap dan menjadi cadangan air tanah pada daerah penelitian hanya memberikan kontribusi sebesar 2% dari total kebutuhan cadangan air tanah di cekungan Bandung.

Sistem pengolahan data spasial dengan memanfaatkan sistem informasi geografi digunakan untuk menentukan daerah prioritas rehabilitasi di cekungan Bandung. Rehabilitasi lahan diperlukan untuk mengurangi degradasi fungsi hidrologi yang sedang terjadi. Peta tingkat kekritisan air dihasilkan melalui analisis spasial (tumpang susun ( overlaying ),tumpang tindih ( intersecting ) serta operasi scoring ) pada topografi, peta tataguna lahan, peta tanah dan peta distribusi hujan. Daerah prioritas rehabilitasi di cekungan Bandung ditentukan dengan cara menumpang susunkan peta tematik tingkat kekritisan resapan air dengan hasil pemodelan airtanah. Hasil penelitian menyimpulkan bahwa dengan menggunakan analisis spasial dalam Sistem Informasi Geografi dapat ditentukan daerah prioritas rehabilitasi di cekungan Bandung. Daerah prioritas rehabilitasi di cekungan Bandung adalah hulu Majalaya, hulu Soreang, Lembang, Tanjungsari, Cimahi (Batujajar) dan daerah sekitar Gununghalu. Rehabilitasi yang disarankan untuk mengurangi degradation hidrologi adalah perbaikkan tutupan lahan di hulu daerah problematik.