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"This study is intended to simulate the river discharges in major watersheds of northwestern Java, Indonesia. The five largest watersheds are considered: Ciujung, Cisadane, Ciliwung,Citarum, and Cimanuk. The simulation period covers the 20thcentury and early 21st century,from January 1901 to June 2006, at a monthly time step. Discharge simulation was carried out using STREAM (Spatial Tools for River Basins and Environmental and Analysis ofManagement Option). The input data for the simulation are climate (precipitation and temperature), land cover and topographic data. Setup and analysis of input data are also part ofthis study. The Mann-Kendall test and linear regression were used to detect trends. Temperature datasets show statistically significant increasing trends for all periods and areas. Significantincreasing trends of precipitation occurred in the latest 16-year period (1990-2006) in hilly and middle areas. A positive trend of simulated discharge is seen in all watersheds and periods.They are only significant for Ciujung (periods of 1950-2006 and 1975-2006), Cisadane (periods of 1950-2006 and 1990-2006), and Ciliwung (periods of 1950-2006, 1975-2006, and 1990-2006). The most noteworthy trend is seen in the 1990-2006 period. Over the course of the 20th and early decade of the 21st century, monthly discharges have increased by 3% to 9%."

"This study is intended to simulate the river discharges in major watersheds of northwestern Java, Indonesia. The five largest watersheds are considered: Ciujung, Cisadane, Ciliwung, Citarum, and Cimanuk. The simulation period covers the 20th century and early 21st century, from January 1901 to June 2006, at a monthly time step. Discharge simulation was carried out using STREAM (Spatial Tools for River Basins and Environmental and Analysis of Management Option). The input data for the simulation are climate (precipitation and temperature), land cover and topographic data. Setup and analysis of input data are also part of this study. The Mann-Kendall test and linear regression were used to detect trends. Temperature datasets show statistically significant increasing trends for all periods and areas. Significant increasing trends of precipitation occurred in the latest 16-year period (1990-2006) in hilly and middle areas. A positive trend of simulated discharge is seen in all watersheds and periods. They are only significant for Ciujung (periods of 1950-2006 and 1975-2006), Cisadane (periods of 1950-2006 and 1990-2006), and Ciliwung (periods of 1950-2006, 1975-2006, and 1990- 2006). The most noteworthy trend is seen in the 1990-2006 period. Over the course of the 20th and early decade of the 21st century, monthly discharges have increased by 3% to 9%."

"The stream character as such and its discharge behaviour are the gross results of a range of events and functions of nature. The word 'stream flow' as used in the present text, is referred to 'catchment yield'. This yield is obviously discharge, q, which has dimensions of volume, L3, and time, T, expressed here onwards in cumec (one cubic metre per second) which will ultimately be converted into a single voluminous unit litre and hence referred to as Q. As the Gola River is a spring fed river, its discharge behavior is absolutely dependent on the subsurface flow of Siwalik Ranges. It has been noticed that the subsurface flow fluctuates according to the monsoonal and non-monsoonal precipitation intensity. Hence, an interesting seasonal rhythm is noticed in the monsoonal and nonmonsoonal discharge with the changing values of stream magnitude and velocity."

"Tujuan penelitian ini berupaya untuk mengidentifikasi perkembangan meander di Daerah Aliran Kali Pemali dalam periode tahun 2004 ?2014 dan menetapkan faktor-faktor yang mempengaruhinya. Citra Quickbird multitemporal digunakan untuk mengidentifikasi perubahan alur meander. Dinamika meander menunjukkan kecenderungan yang semakin berkelok atau sinuosity index meningkat dengan pengaruh besar dari peningkatan debit, sedangkan faktor lainnya adalah kemiringan lereng. Faktor yang sedikit mempengaruhi dinamika meander adalah penggunaan tanah tepi meander dan aktivitas manusia seperti penambangan, penlurusan (penyodetan) alur sungai, dan pembangunan tanggul buatan (artificial levee). Data yang digunakan adalah debit sungai, produksi sedimen suspensi, penggunaan tanah tepi meander, pembangunan tanggul buatan, serta lokasi tambang batu dan pasir besi.

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The present study was carried out to indentify factors influencing the meanders dynamic in Kali Pemali Watershed in the period 2004 ?2014. This study has used multitemporal Quickbird imagery to identify meanders planform change. The analysis shows that the Meanders dynamics increasingly meandering, or sinuosity index increased because increased of discharge. Factors that slightly affect the meanders dynamics are gradient, landuse, and human activities such as mining, river straightening, and construction of artificial levee. Data used in this study are river discharge, production of sediment suspension, landuse, artificial levee, and the location of mining."

"Respon hidrologi di Daerah Aliran Sungai DAS perkotaan yang telah mengalami perkembangan wilayah ditandai oleh fluktuasi debit. Indikasinya adalah tingkat flashiness yang semakin besar. Melalui pengolahan data debit harian selama tahun 1994-2016 dengan metode Indeks Richard-Baker IRB, dianalisis tingkat flashiness pada empat sungai di DAS Citarum yang dikaitkan dengan perubahan karakteristik DAS dan curah hujan. Hasil analisis keruangan dan temporal menunjukkan bahwa indeks flashiness Sungai Cimeta paling tinggi. Variasi indeks flashiness pada empat sungai tersebut relatif homogen yang menunjukkan daerah pegunungan. Indeks flashiness tertinggi terjadi pada musim pancaroba dan flashiness terendah terjadi pada musim kemarau. Kerapatan jaringan sungai dan tutupan lahan berpengaruh pada indeks flashiness. Tingkat flashiness pada tahun-tahun El Nino relatif lebih kecil dibandingkan pada tahun-tahun bukan El Nino.

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Hidrologic response in developed urban watershed marked from discharge fluctuation. The indication is increasing from flashiness level. Through daily discharge data processing during 1994 2016 with Richard Baker Index RBI , analyzed the flashiness level derived from four rivers in Citarum watershed connected with change of watershed characteristics and rainfall. The results of spatial and temporal analysis show that flashiness level of The Cimeta River is highest. Variation of flashiness index on four rivers is relatively homogeneous indicating mountainous area. The highest level of flashiness occurs during the transition season and the lowest flashiness occurs during the dry season. The density of river network and land cover affects the flashiness index. The level of flashiness in El Nino years is relatively smaller than in years not El Nino."

"ABSTRAKTujuan penelitian ini adalah untuk mengetahui sampai seberapa jauh pengaruh kualitas air sungai yang buruk mempengaruhi kualitas air sumur penduduk, sehubungan dengan masih banyaknya penduduk di RW 04 Kelurahan Manggarai yang menjadikan air sungai sebagai tempat membuang hajat dan menggunakan air sumur pampa sebagai air baku air minum.Masalah pokok yang diteliti adalah (a) berapa besar kandungan Escherichia coil di dalam air sumur-sumur pompa tangan penduduk pada jarak dari tepi sungai, kedalaman, dan pemakaian air yang berbeda-beda; (b) korelasi antara nilai Most Probable Number (MPN)" koli tinja dengan parameter fisika-kimia, sehingga dirumuskan hipotesis sebagai berikut:1) Makin banyak pemakaian air sumur, makin besar kemungkinan terkontaminasi koli tinja.2) Makin dalam sumur pompa penduduk, makin kecil kemungkinan terkontaminasi oleh bakteri koli tinja.Penelitian ini dilaksanakan dengan cara mengambil sampel-sampel air sumur secara sensus dan air sungai secara acak, masing-masing 3 kali ulangan selama 3 hari berturut-turut di awal musim kemarau. Di samping itu diambil pula data kuesioner, wawancara, dan observasi langsung sebagai data penunjang.Pengujian hipotesis dilakukan dengan cara analisis statistik menggunakan korelasi jenjang Spearman terhadap nilai MPN koli tinja dan parameter fisika-kimia.Hasil penelltian menunjukkan bahwa 9 dari 14 sumur pompa tangan yang diteliti telah tercemar oleh bakteri koli tinja, di mana faktor jarak dan kedalaman berpengaruh terhadap nilai MPN koli tinja. Sedangkan besarnya pemakaian air tidak berpengaruh terhadap nilai MPN koli tinja. Di samping itu sanitasi lingkungan yang buruk dan tingkah laku masyarakat yang kurang saniter turut membantu pencemaran koli tinja ke air sumur-sumur pompa.Salah satu dampak pencemaran sumber air oleh E. coli di wilayah ini adalah tingginya angka penderita penyakit diare dan angka kematian bayi. Di samping itu kandungan E. coil yang tinggi juga merupakan beban yang berat bagi pihak Proyek Air Minum (PAM) DKI Jakarta dalam proses pengolahan air baku air minum.Diharapkan penurapan dan pemindahan lokasi pemukiman penduduk RW 04 (RT 006 sld RT 0017) ke lokasi pemukiman baru dapat menjadi prioritas pembangunan di Kecamatan Tebet. Hal ini mengingat kondisi kualitas air yang sangat buruk di samping lokasi tersebut (bantaran sungai) memang tidak layak sebagai kawasan pemukiman. Di dalam Rencana Bagian Wilayah Kota (RBWK) Kecamatan Tebet tahun 2005, kawasan tersebut telah diperuntukan sebagai kawasan hljau tanpa bangunan.

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ABSTRACT

The aim of this research is to know how deep the bad river water quality influences the well-water-pump quality in relation to the fact that people at RW 04 Manggarai Village use the river as a defecation place and the well-water-pump as the source of drinking water.

Research points of view are (a) how many Escherichia coli present in the well-water-pump in different distances from the river edge, in different depth of the well, and in different quantity of water usage; (b) the correlation between MPH fecal coil and physic-chemist parameters.

Therefore, the formulations of hypothesis are: (l) the more well-water-pump usage, the bigger the potentiality of fecal col. contamination. (2) The deeper the well water pump, the lesser the potentiality of fecal coli contamination.

This research was implemented by taking the well-water-pump samples with census sampling method and the river water samples with random sampling method, each sample 3 times a day for 3 consecutive days in the early dry season. Questioners, interviews, and direct field observation were also taken as supporting data.

Statistical analysis of the hypothesis was performed with Spearman rank correlation to the value of MPN fecal cola and physic-chemist parameters.

The result of this research indicates that 9 from the 14 well-water-pump tested were polluted by fecal coil bacteria, with distance and depth factors influencing the value of MPN fecal coll. Whereas the quantity of well water pump usage did not influence the value of MPN fecal coli. In addition, bad environmental sanitation and less sanitary-conscience human behavior also supported the fecal coil contamination to the well water pump.

Among the impacts of water-source pollution by E. coli in this area were the high diarrhea sufferer and infant mortality rate. The high E. coil content in the water source also represent the heavy burden of the drinking water processing at Jakarta Municipal Water Treatment Plant (PAM DKI Jakarta).

We hope that the plastering of river edges and the transfer of residents of RW 04 (RT 006 to RT 0017) to the new residence location would be the development priority of Tebet Sub district, considering the bad water quality and improper residence location. In the Regional City Division Plan (RBWK) of Tebet Sub district 2005, this area would be a green-open space."

"Air merupakan kebutuhan esensial kedua yang paling banyak dibutuhkan manusia setelah oksigen. Namun, penggunaan air kian meningkat enam kali lipat selama 100 tahun terakhir dan akan terus tumbuh sekitar 1% per tahun sejak 1980-an. Dengan begitu, sumber daya air semakin dieksploitasi untuk memenuhi permintaan yang terus meningkat. Pada saat kebutuhan air yang terus meningkat, BMKG menginformasikan bahwa wilayah Jawa Barat berpotensi mengalami kemarau panjang yang disertai El Nino. Kemarau panjang itu sendiri dapat menyebabkan krisis air. Kabupaten Majalengka Kabupaten Majalengka menjadi salah satu wilayah yang memiliki riwayat kemarau panjang yang mengakibatkan krisis air. Sebagai salah satu sumber air di Kabupaten Majalengka, maka perlu dilakukan analisis ketersediaan air terhadap DAS Cilutung. Analisis ketersediaan air menggunakan persamaan Meijerink (1994), dimana persamaan ini menghitung air yang meresap ke dalam tanah dengan memanfaatkan data iklim, karakteristik fisik, dan luas wilayah.

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Water is the second most essential need for humans after oxygen. However, water use has increased sixfold over the past 100 years and has continued to grow at around 1% per year since the 1980s. That way, water resources are increasingly being exploited to meet the ever-increasing demand. At a time when the need for water continues to increase, the BMKG informed the public that the West Java region has the potential to experience a long dry season accompanied by El Nino. The long drought itself can cause a water crisis. Majalengka Regency Majalengka Regency is one of the areas that has a long history of drought, which has resulted in a water crisis. As one of the water sources in Majalengka Regency, it is necessary to analyze the water availability of the Cilutung Watershed. Analysis of water availability uses the Meijerink equation (1994), where this equation calculates the amount of water that seeps into the ground by utilizing climate data, physical characteristics, and area."

"The potential of surface water supply in Cicatih-Cimandiri watershed is apparent as river flows along the year and catered from abundant spring waters. This potential water resources e used for various uses of deomestic, industry municipal, and agriculture. Increasing water requirements in the area in the last decade, with growing bottled water industries , water supply needs to be calculated more accurately. To determine river flow discharge, an AWLR (automatic water level recorder) was installed at one of the tributory, Cibojong, based on scoring analysis, there are two parameters (density of drainage network and maximum stream order) that have significant influence to surface water supply. Results of analysis indicated that proportions of the two parameters contributing to river discharge were balanced. To optimize water allocation, irrigation scheduling schemes was exercised to support existing rice field practices. Beside that, total water supply for 15 sub-districts in Cicatih-Cimandiri watershed ranges from 69.637 MCM to 336.177 MCM in dry season and ranges about double in west season. Total irrigated rice area in the 15 sub-districts was about 15.093 ha (BPS Survey , 2007) therefore the potential water supply would be sufficient to support three rice planting seasons."

"Air hujan dapat dinilai merugikan bagi suatu lingkungan perkotaan dalam tingkat yang besar, tetapi juga dapat bernilai bermanfaat, jika dikelola dengan baik untuk meningkatkan pemanfaatan kembali air oleh alam, dengan tujuan jangka panjang yaitu untuk dapat dimanfaatkan oleh masyarakat yang hidup pada daerah yang mengalami hujan tersebut. Oleh karena itu, program ?Water Balance Model? (WBM) yang dikembangkan oleh Pemerintah Daerah British Colombia, Kanada, digunakan untuk membandingkan antara volume air antara air hujan (total rainfall) dengan limpasannya (discharge) , begitu juga dengan jumlah infiltrasi yang dapat dihasilkannya, yang dapat ditingkatkan oleh penerapan teknologi Surface Enhancements dan Source Controls dari aplikasi Manajemen Air Hujan Perkotaan (Urban Rainwater Management).Tujuan dari studi ini adalah untuk menguji kemampuan program WBM, yang hanya dapat diakses dari situs www.waterbalance.ca, dengan mengikuti semua tahapan yang diperlukan oleh program tersebut. Sebelum program WBM ini dapat diuji, diperlukan terlebih dahulu untuk mencari berbagai macam data yang dibutuhkan untuk dapat mengoperasikan program dengan benar, seperti antara lain data hujan, topografi, jenis tanah, penggunaan lahan (tipe & luas), dan penutup permukaan lahan, untuk dapat mewakili daerah yang akan ditinjau tersebut, dalam hal ini daerah perwakilan untuk Sub-DAS Sugutamu.Data-data lain yang diperlukan adalah juga data mengenai teknologi source controls dan surface enhancements, dari teknologi Best Management Practice (BMP) yang mendukung konsep Low-Impact Development (LID), yang sudah tersedia oleh program WBM ini. Setelah pengumpulan semua data tersebut, program dapat digunakan dengan memasukkan semua data yang sudah diperoleh kedalam program WBM melalui situs program, dan melihat hasil yang keluar setelah program dijalankan, untuk selanjutnya dapat dianalisa. Hasil yang diperoleh dari seluruh perhitungan di dalam program akan berupa beberapa macam grafik.Ada dua macam grafik yang dihasilkan tersebut, yaitu grafik Exceedance Summary, yaitu grafik yang menunjukkan jumlah limpasan yang terjadi dalam suatu jenjang waktu tertentu, dan juga Volume Sumamry, yaitu grafik yang memperlihatkan perbandingan antara volume limpasan total (Total Discharge) , dengan kehilangan total (Total Losses) , infiltrasi DAS (Catchment Infiltration) , dan infiltrasi dari teknologi source control (Source Control Infiltration) . Oleh karena program WBM ini masih di dalam masa percobaan, maka semua hasil yang diperoleh hanya berupa suatu hasil rekayasa saja untuk menguji kemampuan yang dimiliki oleh program WBM tersebut.

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Rainwater can be considered harmful for an urban environment in excess amounts, but can also become valuable, if well managed to enhance the natural restoration of water within the environment, with the long-term objective for the restored water to be used by the local community living within the area of this rainfall. Therefore, the ?Water Balance Model? (WBM) program which was developed by the Local Government of British Colombia, Canada, is used to compare the volume of water between total rainfall and its discharge, along with the total infiltration which it can produce, which can be enhanced by applying Surface Enhancement and Source Control technology through the application of Urban Rainwater Management.

The main objective of this study is to test the abilities of the WBM program, which can only be accessed through ?Water Balance Model? website, which is www.waterbalance.ca, by following the specific steps needed by the program itself. Before the WBM program can be tested, several types of data is needed to properly operate this program, such as rainfall data, topographic data, soil type data, land use data (type & area), and surface type data, which can represent the area in which is to be observed, in this case the representation area of the Sugutamu Sub-River Basin.

Other data which is needed include data regarding source control and surface enhancement technology, from Best Management Practice (BMP) technology which supports the Low-Impact Development concept, which is already provided by the WBM program. After gathering all of the data, the program can be used by inputing all the required data into the WBM program through the program website, and seeing the results which are produced after the program is run, to be used for further analysis. The results which are produced from all calculations in the program are in the form of several different types of graphs.

There are two different types of graphs which are produced, which are the Exceedance Summary graph, which shows the amount of runoff which occurs in a certain time frame, as well as the Volume Sumamry graph, which shows the comparison between volumes of the Total Discharge, with the Total Losses, Catchment Infiltration, and Source Control Infiltration. Because the WBM program is still under testing, therefore all the results produced are only engineered results, to test the abilities of this WBM program."