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"The lakes in urban megacity Jakarta, called as ?setu or situ? by the local people, play a central role in integrated water resources management. Despite its pivotal role in maintaining the balance of urban water system, they have not received sufficient attention. Rapid urban development in a very distinct urban watershed type of lake?s surroundings has impacted on the water quantity and quality of urban lakes in megacity Jakarta. Chronic problems faced by downstream area in megacity Jakarta such as flash floods in the rainy season and water scarcity in the dry season have indicated that the lakes have not been managed and functioned well. Human and nature disturbances such as shoreline encroachment, shoreline erosion, garbage dump and inflow from untreated sewage and urban runoff have polluted the lake water and reduced its volume capacity. Nearly half of the existing lakes have reduced from 10 to > 50% of its water volume capacity due to lake area shrinkage, siltation and even excessive growth ofinvasive macrophytes. The lakes are mostly in disturbed to damaged environmental conditions. Lakes in urban and rural villages have less in water quantity and higher solids, organic matter, nutrients and even fecal bacteria concentrations than the lakes in planned residential, high-rise residential and industrial areas types of urban surroundings. As the lakes in the urban village and industrial area, elevated toxic metal concentrations have become public concern due to lake hygiene problems. Elevated nutrient concentrations have caused the lake eutrophication, where some lakes have suffered from excessive macrophyte coverage, algal bloom even toxic cyanobacterial bloom. The urban lakes in megacity Jakarta constantly have been degrading physically and ecologically affecting its water quantity and quality which is increasing the threat to human?s health and impact future human?s resilience in urban megacity Jakarta."

"Penelitian mengenai penilaian kesehatan perairan situ di Kampus Universitas Indonesia Depok dengan IBI (Index of Biotic Integrity) telah dilaksanakan di Situ Kenanga, Agathis, Mahoni, Puspa, Ulin, dan Situ Salam pada bulan Maret -- April 2016. Penelitian bertujuan untuk mengetahui apakah IBI dapat digunakan untuk menilai kesehatan perairan Situ Kampus UI dan bagaimana kondisi kesehatan perairan Situ Kampus UI. IBI diaplikasikan berdasarkan karakter komunitas ikan yang ada. Pengambilan sampel ikan dilakukan dengan metode sampling bebas menggunakan alat electrofishing gear, push net, cast net mata jaring 2,5 cm, dan lift net. Hasil penelitian menunjukkan bahwa IBI dapat digunakan untuk menilai kesehatan perairan berdasarkan komunitas ikan di Situ Kampus UI dengan diterapkannya beberapa modifikasi metrik. Kesehatan perairan di Situ Agathis, Mahoni, Puspa, dan Ulin tergolong sedang; kesehatan perairan di Situ Salam tergolong baik.

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A research about an assesment of freshwater lakes health in University of Indonesia Campus Depok has been implemented on Kenanga, Agathis, Mahoni, Puspa, Ulin, and Salam Lakes from March to April 2016. The aim of the study is to know if IBI (Index of Biotic Integrity) can be applied on UI Campus Lakes for assess freshwater lakes health and how is the condition of freshwater health in UI Campus Lakes. IBI is applied based on character of existing fish community. Fish sampling was done by free sampling method using an electrofishing gear, a push net, a cast net [mesh 2.5 cm], and a lift net. The results showed that IBI can be used to assess freshwater health based on fish community in UI Campus Lakes by applying several metric modifications. Freshwater health on Agathis, Mahoni, Puspa, and Ulin Lakes classified as moderate/fair; freshwater health on Salam Lakes classified as good."

"ABSTRACTWater Sensitive Urban Design WSUD systems have the potential prevent the hydrologic disturbance and water quality concern associate with storm water runoff due to land change from urban development. WSUD have been strongly recommended to be used and new developments in every city in Australia are regulated. However, Indonesia still developing the rule but not deeply studied the idea and concept of WSUD. The objective of this research is to comparing available system in sustainable city of case study to the concept that is used in Australia. The main idea of why it is applied in Australia is due to most of the land use are impervious area which is increase in runoff peak and develop industrialize region.

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ABSTRAKWater Sensitive Urban Design WSUD system memiliki potensi mencegah gangguan dan menambah kualitas air dari limpasan air hujan akibat perubahan lahan dari pembangunan perkotaan. WSUD telah disarankan untuk digunakan dalam perkembangan baru di Australia. Indonesia masih mengembangkan aturan tetapi tidak mendalam mempelajari ide dan konsep WSUD. Tujuan dari penelitian ini adalah untuk membandingkan sistem yang tersedia di kota yang berkelanjutan dari studi kasus dengan konsep yang digunakan di Australia. Ide utama mengapa konsep WSUD diterapkan di Australia adalah karena industrialisasi sebagian besar penggunaan lahan hijau berubah dan mengakibatkan puncak limpasan besar."

"Danau Kenanga merupakan salah satu dari enam danau UI yang berperan sebagai daerah resapan air. Namun danau ini telah tercemar oleh berbagai jenis sampah organik dan anorganik, sedimen, residu pestisida, dan kontaminan lainnya, sehingga dapat menurunkan kualitas air. Oleh karena itu, penelitian ini bertujuan untuk mengoptimalkan proses pengolahan air Danau Kenanga dengan menerapkan metode Hybrid Ozonation-Coagulation (HOC), dengan fokus pada variasi pH dan dosis koagulan. Metode HOC diharapkan dapat meningkatkan efisiensi penghilangan polutan organik dan memastikan air memenuhi baku mutu kesehatan lingkungan. Analisis parameter seperti kandungan logam besi, mangan, pH, Total Dissolved Solid (TDS), total koliform, dan jumlah lumpur dilakukan untuk mengevaluasi efektivitas HOC. Hasil penelitian menunjukkan bahwa HOC merupakan metode yang paling efektif dibandingkan metode koagulasi dan ozonasi dalam pengolahan air Danau Kenanga dengan persentase perubahan TDS sebesar 18,18% dan persentase penyisihan kekeruhan sebesar 93,7%, logam Fe 84,75%, total coliform 99,69% , nilai logam Mn sebesar 0,1 mg/L, jumlah lumpur yang terakumulasi sebesar 1,4708 g pada pH 8 dan dosis koagulan Fe sebesar 50 ppm.

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Lake Kenanga is one of the six UI lakes which acts as a water catchment area. However, this lake has been polluted by various types of organic and inorganic waste, sediment, pesticide residues, and other contaminants, which can reduce water quality. Therefore, this research aims to optimize the Lake Kenanga water treatment process by applying the Hybrid Ozonation-Coagulation (HOC) method, with a focus on variations in pH and coagulant dosage. The HOC method is expected to increase the efficiency of removing organic pollutants and ensure that water meets environmental health quality standards. Analysis of parameters such as iron metal content, manganese, pH, Total Dissolved Solid (TDS), total coliform, and amount of sludge was carried out to evaluate the effectiveness of HOC. The results of the research show that HOC is the most effective method compared to coagulation and ozonation methods for treating Kenanga Lake water with a TDS change percentage of 18.18% and a turbidity removal percentage of 93.7%, Fe metal 84.75%, total coliform 99.69%, and the Mn metal value is 0.1 mg/L at pH 8 and the Fe coagulant dose is 50 ppm."

"Eceng gondok (Eichhornia crassipes) merupakan tumbuhan air tawar yang berpotensi dijadikan biofilter padatan tersuspensi dalam air. Eceng gondok termasuk tanaman hiperakumulator karena kemampuannya dalam mengakumulasi logam terlarut dalam perairan. Kemampuan tersebut memungkinkan eceng gondok dijadikan sebagai tanaman fitoremediasi. Penelitian terdiri dari tiga kelompok, yaitu eceng gondok sebagai biofilter padatan tersuspensi, penentuan titik jenuh pengikatan padatan tersuspensi oleh akar eceng gondok dan fitoremediasi logam Cu, Cd, Pb, dan Zn. Hasil penelitian menunjukkan bahwa eceng gondok dapat digunakan sebagai biofilter padatan tersuspensi dan agen fitoremediasi Cu, Cd, Pb dan Zn dalam waktu lebih dari 7 hari.

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Water hyacinth (Eichhornia crassipes) is a freshwater plant that has potential as bio-filter of suspended solid in the water. Water hyacinth is one of the hyper-accumulator plants because of its ability to accumulate metals dissolved in water. Such capability can be used as phytoremediation plant. The study consisted of three groups, namely water hyacinth as a bio-filter of suspended solid, determining point of saturation binding suspended solid by its roots and phytoremediation of Cu, Cd, Pb, and Zn. The results showed that water hyacinth can be used as a bio-filter of suspended solid and phytoremediation agent of Cu, Cd, Pb and Zn in more than 7 days."

"ABSTRAKPerairan Teluk Jakarta telah mengalami degradasi ditandai dengan meningkatnya sebaran konsentrasi Total Suspended Solid TSS , ditambah dengan adanya reklamasi yang akan mengubah morfologi pesisir. Faktor yang mempengaruhi sebaran konsentrasi TSS ialah debit, arus dan pasang-surut. Tujuan penelitian ini untuk melihat pengaruh reklamasi terhadap kualitas perairan dengan menganalisis pola sebaran TSS. Penelitian ini menggunakan citra Landsat 5 dan Landsat 8 OLI/TRS dalam mengidentifikasi sebaran konsentrasi TSS sebelum dan sesudah reklamasi, serta menggunakan metode Trend Surface Analysis untuk melihat kecenderungannya. Analisis yang digunakan dalam penelitian ini adalah analisis deskriptif, analisis temporal, dan analisis komparatif spasial. Hasil penelitian menunjukkan terdapat perbedaan pola sebaran sebelum dan sesudah reklamasi, Debit dan Arus Laut berpengaruh besar terhadap sebaran perairan keruh pada periode sebelum reklamasi. Serta tidak terlepas juga oleh pengaruh pasang-surut sebagai variasi spasial.

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ABSTRACTThe waters of Jakarta gulf have been degraded by the increasing concentration of Total Suspended Solid TSS , coupled with the reclamation that will change coastal morphology. Factors affecting the distribution of TSS concentration are discharge, current and tidal. The purpose of this research is to see the effect of reclamation on water quality by analyzing TSS distribution pattern. This study uses Landsat 5 and Landsat 8 OLI TRS in identifying the distribution of TSS concentrations before and after reclamation, and using the Trend Surface Analysis method to see trends. The analysis used in this research is descriptive analysis, temporal analysis, and spatial comparative analysis. The result of the research shows that there is difference of distribution pattern before and after reclamation, water discharge and current sea affect the distribution of TSS concentration after reclamation. And also the influace of tides as spatial variation."

"Danau Maninjau diketahui memiliki aktivitas KJA yang intensif dan fenomena kematian massal ikan di perairan tersebut sering terjadi. Tubo Belerang", adalah istilah yang ditandai dengan adanya kematian massal ikan yang dipelihara pada karamba jaring apung (KJA) di Danau Maninjau. Untuk mengenali indikasi "tubo Belerang" di Danau Maninjau, telah dilakukan pengamatan pola stratifikasi beberapa parameter kualitas air, meliputi suhu, oksigen terlarut (DO; Dissolved Oxygen) dan kadar bahan organik total (TOM; Total Organic Matter). Pengamatan dilakukan pada Agustus, Oktober, Desember 2011 dan Maret 2012 di lima stasiun yang berbeda, pada strata 0 , 25, 50, 75, 100, 125 dan 150 m, yang disesuaikan dengan kedalaman masing-masing stasiun. Pada Desember 2011 dan Maret 2012, parameter DO diukur pada kedalaman 5, 10, 15 dan 20 m. Sebagai paremeter pendukung, diukur kandungan klorofil pada kedalaman 0, 1,5, 3,0 dan 4,5 m, kedalaman Secchi, dan juga kadar total fosfor (TP) dan total nitrogen (TN) pada lapisan permukaan. Berdasarkan kadar klorofil, kedalaman Sechi, kadar TP dan TN, perairan Danau Maninjau menunjukkan kondisi eutrofik. Suhu air relatif stabil pada kedalaman di bawah 25 meter, kondisi anoksik ditemukan pada lapisan air hingga kedalaman 15 m. Kadar TOM berkisar 5,9-24,9 mg/L, dan tidak ada pola khas pada distribusi vertikal TOM. Kondisi ini secara umum sering digambarkan sebagai upwelling tetapi sebenarnya merupakan proses turnover."

" Situ (shallow lake) Cibuntu which is located on LIPI Cibinong Complex facing superficiality caused by sedimentation which was dominated by highly TSS (Total Suspended Solids) load. Local people utilize this shallow lake for fisheries activity. In order to maintain the sustainability of its utilization, it was needed a management concept development based on its aquatics physical characteristics. The objective of this research was to determine the each relation of observed water quality parameter. Monitoring on aquatics physical parameter such as water temperature, turbidity, TSS and water conductivity conducted on March, May, July, October, December 2008 and February 2009 at seven stations. The condition of Situ Cibuntu was characterized by the average of its water temperature 27.64~�C, water turbidity 15.97 NTU, TSS 53.60 mg/L and water conductivity 0.119 ~kS/cm which exhibited this shallow lake waters appropriate for fish culturing water quality standards. The result show that water turbidity was had positive correlation to TSS (r=0.996) which indicated that higher TSS causing water turbidity increased accordingly."

"Sungai Pesanggrahan dari karakteristik lebar sungainya merupakan sungai menengah. Kandungan kimia dan biologis air Sungai Pesanggrahan menunjukan bahwa Sungai Pesanggrahan sudah tercemar. Pencemaran air Sungai Pesanggrahan lebih besar ditemukan pada kawasan hilir, hal ini disebabkan menumpuknya senyawa-senyawa kimia yang bersumber dari limbah industri dan domestik. Daerah Aliran Sungai Pesanggrahan sebagian besar merupakan kawasan permukiman. Pembangunan kota di Daerah Aliran Sungai Pesanggrahan menjadi pengaruh besar terhadap penurunan kualitas air Sungai Pesanggrahan. Pembangunan tersebut paling besar terjadi pada periode 2004-2010. Lalu, pada periode 2010-2013 pembangunan lebih banyak pada perubahan struktur aliran Sungai Pesanggrahan, yaitu pada pelebaran dan pelurusan sungai. Kawasan pada Daerah Aliran Sungai Pesanggrahan banyak digunakan sebagai area industri ilegal, sehingga melanggar ketentuan tata ruang yang ada. Peran Pemerintah Kota Jakarta dalam menjaga kualitas air sungai yaitu pada fungsi pembangunan dan pengawasan bangunan-bangunan yang melanggal aturan. Hal ini merujuk pada pemberian izin dan terakhir pada penindakan terhadap pihak-pihak yang melanggar dan berperan dalam penurunan kualitas air Sungai Pesanggrahan.

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The Pesanggrahan River from the characteristics its river width is an intermediate river. The chemical and biological content of Pesanggrahan River water shows that the Pesanggrahan River has been polluted. Water pollution in the Pesanggrahan River is greater in the downstream area, this is due to the accumulation of chemical compounds from industrial and domestic waste. Most of the Pesanggrahan Watershed are residential areas. City development in the Pesanggrahan Watershed has a major influence on the decline in the water quality of the Pesanggrahan River. The biggest development occurred in the period 2004-2010. Then, in the 2010-2013 period the development was more on the changes in the structure of the Pesanggrahan River flow, namely on river widening and straightening. The area in the Pesanggrahan Watershed is widely used as an illegal industrial area, thus violating existing spatial provisions. The role of the Jakarta City Government in maintaining river water quality is in the function of building and supervising buildings that violate the rules. This refers to the granting of permits and finally to prosecution of parties who violate and play a role in decreasing the quality of the Pesanggrahan River water."