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"Daerah Aliran Ci Leungsi Hulu memiliki kondisi geologi dan topografi yang beragam. Disamping itu, terjadi peningkatan lahan terbangun yang dapat memberikan dampak terhadap keseimbangan unit respon hidrologi URH Penelitian ini fokus pada pemodelan hidrologi dengan model SWAT untuk mengetahui pengaruh perubahan penggunaan tanah terhadap perubahan limpasan dan memprediksi perubahan limpasan yang akan terjadi tahun 2020 dan 2030 Prediksi perubahan penggunaan tanah dibuat dengan memproyeksikan perubahan penggunaan tanah historis tahun 1989 2014 yang diperoleh dari citra Landsat Hasil penelitian menunjukan bahwa keberagaman kondisi URH mempengaruhi karakteristik limpasan di setiap sub DAS Hasil uji akurasi dan kalibrasi model adalah memuaskan dengan nilai NS sebesar 0 61 Perubahan penggunaan tanah terutama lahan terbangun URHD meningkat sebesar 12 5 pada tahun 2020 dan 36 5 pada tahun 2030 terhadap luas URHD pada tahun 2014 menyebabkan terjadi peningkatan terhadap rata ndash rata limpasan bulanan limpasan maksimum dan limpasan minimum pada tahun 2020 dan 2030 di seluruh sub DA Ci Leungsi Hulu

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Ci Leungsi Hulu watershed has a varied geological and topographical condition Apart from that there is increased build up area affects the Hydrology Response Unit URH This study focuses on the hydrological modelling made by SWAT to find the effects of land use changes to the surface runoff changes and to predict how it will change in 2020 and 2030 The landuse change prediction is made by projected the land use change in 1989 ndash 2014 which obtained from Landsat This study shows that variations of HRU conditions affect the characteristics of the surface runoff in every subwatershed The result of accuracy and calibration test satisfies the NS minimum which has the mark of 0 61 The changes of land use particularly build up area URHD increased of 12 5 in 2020 and 36 5 in 2030 to URHD in 2014 caused an increased to the average maximum and minimum surface runoff of the subwatersheds of Ci Leungsu Hulu watershed;"

"Penelitian ini bertujuan untuk mengetahui pengaruh distribusi curah hujan dan karakteristik fisik setiap sub-DAS Ci Liwung Hulu yang terdiri dari topografi, jenis tanah dan penggunaan tanah terhadap debit aliran Daerah Aliran Ci Liwung Hulu. Metode yang digunakan adalah Soil Conservation Service (SCS) yang disimulasikan menggunakan model hujan-debit HEC-HMS yang di validasi menggunakan metode RMSE dan Nash. Hasil pengolahan data menunjukan bahwa karakteristik dan distribusi hujan setiap sub-DAS mempengaruhi besar kecilnya debit yang dihasilkan. Sub-DAS Ci Liwung (Tugu) merupakan sub-DAS yang menghasilkan sumbangan debit terbesar pada DA Ci Liwung Hulu pada kejadian banjir Tahun 2002 dan 2007. Berdasarkan hasil validasi, simulasi, data curah hujan radar cuaca memiliki nilai simpangan yang lebih kecil dibandingkan data curah hujan observasi. Penggunaan data radar cuaca memberikan gambaran distribusi hujan spasial dengan resolusi tinggi dan dapat digunakan untuk memprediksi debit aliran yang dihasilkan oleh suatu Daerah Aliran Sungai (DAS).

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This study aims to determine impact of rainfall distribution and physical characteristics in each sub-watershed towards run-off in the Upper Ci Liwung Watershed. It consist of topography , soil type and land use. The method utilizing Soil Conservation Service (SCS ) applied on HEC - HMS rainfallrunoff model and was validated using the RMSE and Nash.

The results show that the physical characteristics and rainfall distribution of each sub-watershed has significant impact on the run-off in Upper Ci Liwung Watershed especially sub-watershed Ci Liwung ( Tugu) on the flood events of 2002 and 2007.

Based on the simulation validation result, weather radar rainfall data has a deviation value smaller than rainfall data of observation . Weather radar data provide accurate rainfall measurements at high resolution and can be applied to predict run-off in watershed."

"Gosong merupakan merupakan salah satu bentukan morfologi pada sungai yang merupakan akumulasi dari sedimen yang dibentuk dari batu, kerikil, pasir, atau lumpur, yang membentuk seperti pulau ditengah/tepi sungai (Charlton, 2008). Dinamika morfologi gosong dapat menjadi indikator perubahan lingkungan pada daerah sungai. Penelitian ini ditujukan untuk meneliti perubahan bentuk dari morfologi gosong pada alur Ci Herang, yang merupakan salah satu sub dari aliran Ci Leungsi Hulu. Metode penelitian ini didasari pada interpretasi melalui citra google earth pada tahun 2009, 2012, 2013, dan 2015 dan melalui survei pengukuran di lapangan. Variabel lain yang berpengaruh terhadap gosong, seperti debit aliran, penggunaan tanah, kemiringan sungai, dan tipe alur sungai, diperoleh melalui pengolahan data sekunder peta RBI, dan data curah hujan dari instansi. Hasil penelitian memperlihatkan bahwa morfologi gosong sangat dinamis, baik dalam jangka waktu panjang maupun pada jangka waktu pendek. Gosong pada tipe alur sungai lurus, terutama pada yang tipe alurnya mengalami perubahan menjadi teranyam, cenderung lebih dinamis dibandingkan pada tipe alur lainnya. Debit aliran pada 1 hari sebelum pengamatan sangat berpengaruh terhadap dinamika gosong tersebut.

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Bars is one of morphological formations in the river which is an accumulation of sediment formed of stone, gravel, sand, or mud, which is formed like islands on the center or side of river channel (Charlton, 2008). Dynamics of morphology bars can be an indicator of environmental change in that watershed. This study aimed to examine the changes of bars?s shape in the Ci Herang river, which is one of nine watershed on Ci Leungsi Hulu watershed.

This research method is based on interpretation google earth?s image in 2009, 2012, 2013, and 2015 and also survey in the field. Another variable affecting the bars, such as flow rate, landuse, slope of the river, and the river channel type, obtained through secondary data processing RBI maps, and rainfall data from the agency.

The results showed that the morphological bars very dynamic, both in the long term and the short term. Bars in straight river channel types tend to be more dynamic than the other type. The flow rate at 1 day before observation its most affects the dynamics of the sandbar."

"Penelitian ini membahas tentang perubahan penutup lahan di Sub Daerah Aliran Ci Manuk Hulu, Kabupaten Garut. DAS ini memiliki kondisi geologi dan topografi yang beragam. Disamping itu, terjadi peningkatan lahan terbangun yang terdapat pad Sub DACi Manuk Hulu. Metode yang digunakan dalam penelitian ini adalah metode statistik untuk mengetahui perubahan penutup lahan dalam kurun waktu 2005-2017 sertaperubahan penutup lahan dominan. Untuk menguji akurasi dan kalibrasi digunakan Root Mean Square Error RMSE dengan nilai 1.23091491. Data yang digunakan dalam penelitian ini adalah data Digital Elevation Model, dan data penutup lahan. Hasilpenelitian menunjukan bahwa pola perubahan penutup lahan di Sub-DA Ci Manuk Hulu. Sub sub-DAS 3 dan 4 memiliki perubahan tutupan lahan dominan, yaitu pertanian lahan kering, pertanian lahan kering bercampur dengan semak dan sawah. Sub sub-DAS1 dan 2 memiliki perubahan tutupan lahan dominan pertanian lahan kering. Sementara itu, sub sub-DAS 5 memiliki perubahan tutupan lahan dominan berupa badan air.

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This study discusses the change of land cover in Sub Area Ci Manuk Hulu Flow, Garut regency. This watershed has diverse geological and topographic conditions. In addition, there is an increase in the built land located in Sub DA Ci Manuk Hulu. The method used in this research is statistical method to know the change of land cover in the periodof 2005 2017 and the dominant land cover change. To test the accuracy and calibrationu sed Root Mean Square Error RMSE with the value 1.23091491. Data used in this research is Digital Elevation Model data, and land cover data. The results showed that the pattern of land cover change in Sub DA Ci Manuk Hulu. Sub watersheds 3 and 4have dominant land cover changes, dryland farming, dryland farming mixed with shrub sand rice fields. Sub watersheds 1 and 2 have the dominant land cover change of dry land farming. Mean while, sub sub watershed 5 has a dominant land cover change in the formof water bodies."

"Tahun 2017 Balai Besar Wilayah Sungai Citarum mencatat pencemaran Sungai Citarum terutama daerah hulu DAS terus mengalami peningkatan yang ditandai penurunan kualitas air secara signifikan. Menurut laporan, 47,1% DAS Citarum Hulu mengalami pencemaran berat dengan total cemaran mencapai 280 ton limbah setiap harinya. Penelitian ini bertujuan menganalisis indeks kerentanan yang meliputi: variasi sumberdaya air, kelangkaan air, eksploitasi air, pencemaran air, kapasitas alam, kapasitas fisik, modal sosial, dan kapasitas ekonomi. Hasil analisis kerentanan tersebut menjadi dasar perumusan strategi intervensi untuk menjaga keberlanjutan fungsi eksosistem sungai di wilayah DAS Citarum Hulu.Metode riset yang digunakan adalah kombinasi antara metode analisis spasial, analisis statistik, SEM dan kuisioner. Hasil penelitian menunjukkan nilai indeks kerentanan sebesar 1 yang berarti bahwa kondisi lingkungan di wilayah DAS Citarum Hulu sangat buruk dan diperlukan restorasi wilayah sungai. Kondisi ini mengharuskan berbagai pihak untuk melakukan strategi intervensi yang meliputi aspek sosial, kebijakan, dan teknologi untuk menjaga keberlanjutan fungsi ekologisnya.

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In 2017, the Citarum River Basin Center noted that pollution of the Citarum River, especially the upstream watershed, continued to experience an increase marked by a significant decrease. 47.1% of the Upper Citarum watershed is polluted with a total of 280 tons of waste per day. This study aims to analyze the vulnerability index which includes: variations in water resources, water scarcity, water exploitation, water pollution, natural capacity, physical capacity, social capital, and economic capacity. The results of the vulnerability analysis are the basis to maintain the sustainable. The research method used is a combination of spatial analysis methods, statistical analysis, SEM and questionnaires. The results showed a vulnerability index value of 1, which means the environmental conditions in the Upper Citarum watershed area are bad and require restoration. This condition requires various parties to carry out intervention strategies covering social, policy and technological aspects to maintain the sustainability."

"ABSTRACTThis study estimates the relationship between Forest and Land Rehabilitation policies and the quality and health of watersheds measured by the Coefficient of Flow Regime. The method used is the estimation of the Granger causality relationship. The results of this study indicate that in the short term or less than three years of forest and land rehabilitation does not have a significant relationship with the good value of the coefficient of flow regime. It is hoped that with these findings, the government can review the methodology, institutional system, location, quality of materials and tools for forest and land rehabilitation by taking into account the natural and geographical conditions around the watershed. furthermore, the government can implement other measures to support forest and land rehabilitation in accordance with existing regulations."

"ABSTRACTCimanuk Watershed is one of the important water sources in West Java Province. The damage that occurred in Cimanuk watershed affected the sustainability of water supply in West Java. The administrative area of ​​Cimanuk watershed extends to 4 regencies, namely Garut Regency, Sumedang Regency, Majalengka Regency, and Indramayu Regency. The Cimanuk River itself has a length of ± 338 km which can supply water needs of 2.2 billion m3 every year with the main utilization for irrigation in agricultural areas. Forest areas in the upper Cimanuk watershed affect the continuity of the hydrological, erosion and sedimentation process. Changes in the upstream area in terms of land use and forest exploitation that do not consider environmental aspects can damage the entire watershed ecosystem, causing fluctuations in water flow, sediment transport, and material dissolved in the water flow system. Given the reciprocal relationship in the concept of watershed management, the implementation of the Payment Environmental Services or PES mechanism is important, where water is one of components that deserves be consideration. The economic valuation of water quantified as water prices is also a fundamental reason for the importance of PES studies. Water prices based on scientific calculations, both qualitative and quantitative, determine the feasibility value that will be given from the downstream community upstream as conservation actors to support the concept of fair environmental services. Quantitative analysis is carried out in the form of valuations involving several methods, namely the Contingent Valuation Method, Value of Marginal Product Water, and Full Cost Pricing. The price of water can be used as an indicator of the cost of forest environmental services as a water provider as well as improving market mechanisms. This paper concludes the mechanism of payment for environmental services (PES) through water pricing policies can be an alternative source of funding to improve the condition of a watershed"

"Peningkatan pembangunan di wilayah kampus Universitas Indonesia berakibat pada semakin meningkatnya permukaan kedap air. Dengan demikian maka perlu diketahui klasifikasi kerentanan wilayah Universitas Indonesia terhadap perubahan tutupan lahan kedap air melalui analisis tertentu. Salah satu metode yang memberikan panduan dalam melakukan proses analisis tersebut adalah The Watershed Vulnerability Analysis. Metode ini merupakan metode cepat yang digagas oleh Center for Watershed Protection dan diterbitkan pada tahun 2002. Metode ini membagi wilayah yang dianalisis menjadi tiga klasifikasi yaitu sensitive, impacted dan non-supporting. Dengan demikian maka kondisi daerah yang dilakukan analisis menjadi mudah dikenali dan dapat dijadikan acuan dalam rencana pembangunan wilayah kampus Universitas Indonesia.

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Development growth in campus Universitas Indonesia can impact to the increasing of impervious cover. Thus, it?s necessary to know Universitas Indonesia campus soil vulnerability classification in regards to the impervious cover alteration through a specific analysis. One method that provides guidance in conducting the analysis process is The Watershed Vulnerability Analysis. This method is a rapid method initiated by the Center for Watershed Protection and published in 2002. These rapid, dividing the analysis region?s to one of three classifications which are sensitive, impacted and non supporting. Thus, the conditions in the area of analysis to be easily recognizable and can be used as a reference in the development plan campus Universitas Indonesia."