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Abstrak :
ABSTRAK
Water loss in a channel is an important component of the hydrologic budget for the design and planning of a water diversion and delivery system. Quantitative assessment of channel losses is required in the calculations of flow components of a river basin or reach and the projections of design flows at the withdrawal and delivery points of the water diversion system. In this study, hydrologic methods are employed to determine water losses along the Sheyenne River, a proposed diversion project. The hydrologic budget approach is considered the most appropriate method for the Sheyenne River and the proposed project. Long-term, monthly average, and annual channel losses and their longitudinal distributions are obtained. The estimated losses can be used as the additional discharge, compensating for the losses in the water delivery and supply system.

Abstrak :
ABSTRAK
Daerah Aliran DA Ci Salak dan Ci Sahang merupakan wilayah yang secara geologis memiliki potensi tambang pasir yang tersebar di kaki hingga lereng Gunung Tampomas. Penelitian ini bertujuan untuk menganalisis pengaruh penambangan terhadap penutup lahan dan sumber daya air di DA Ci Salak dan Ci Sahang. Metode overlay dan wawancara dengan metode insidental sampling untuk analisa penutup lahan dan sumber daya air. Hasil penelitian menunjukkan sejak tahun 1988-2016 luas total area yang ditambang sebesar 526,3 Ha dengan arah perkembangan tambang dari barat ke timur. Pertambangan dilakukan pada ketinggian antara 500-1000 mdpl dengan kemiringan lereng 0-8 hingga 25-45 . Area tambang lebih dominan dilakukan pada penutup lahan ladang dan lahan terbuka, jenis tanah regosol, serta jenis batuan lava Qyl dan tuff berbatu apung Qyt . Pengaruh penambangan terhadap kualitas mata air adalah dengan meningkatnya konsentrasi kekeruhan dan phosphat, sedangkan peningkatan konsentrasi TSS dan Fe terjadi di saluran air di sekitar tambang. Penurunan kuantitas akibat penambangan berupa berkurangnya jangkauan air yang mengairi sawah dan ladang serta untuk kebutuhan rumah tangga di 10 sepuluh kampung di sekitar DA Ci Salak dan Ci Sahang dengan radius terdekat terdekat 500m dan radius terjauh 2000m dari mata air.

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ABSTRACT
Ci Salak and Ci Sahang watershed are geologically potential areas of sand mining, which spread over the foothill of Mount Tampomas. This study aims to analyze the effect of mining on land cover and water resources in Ci Salak and Ci Sahang watershed. Overlay methods and interviews using incidental sampling methods were used in this study for analysis of land cover and water resources. The results show that since 1988 2016 the total area of mining reached to 526.3 Ha with the direction development of the mining from west to east. Mining is done at an altitude between 500 1000 mdpl with a slope of 0 8 to 25 45 . Mining areas are dominant to change the fields small holder land use and bare soil, regosol soil types and lava Qyl and Pumiceous Tuff Qyt rock types. The effect of mining on the quality of water springs can be seen by the increasing of the turbidity concentration and phosphat, while the increase of TSS and Fe concentration occurs in the water channel around the mining area. The decrease of water quantity due to mining result in the decrease of water coverage which irrigates the paddy fields and small holder, including for the household needs for 10 ten villages around Ci Salak and Ci Sahang watershed, with nearest radius at 500m and the farthest radius at 2000 m from springs

Abstrak :
Tingginya kebutuhan listrik pada masyarakat untuk pemenuhannya membutuhkan sumber daya air, dikarenakan air di Indonesia sangat melimpah. Namun dalam pelaksanaannya perlu pengaturan terhadap pengembangan pembangkit listrik tenaga air (PLTA) yang masuk ke dalam energi baru terbarukan (EBT). Adapun kondisi pemerintah yang masih terbatas sehingga dibutuhkan kerjasama antara pemerintah dengan swasta. Wawasan lingkungan sering kali dilanggar oleh swasta/PLTA dan dapat berpotensi menimbulkan permasalahan dalam ketersediaan sumber daya air untuk masyarakat. Jadi oleh karena itu perlu dilihat bagaimana jalan keluar yang harus dibuat oleh pemerintah. Pembahasan permasalahan dalam penelitian ini yakni: pertama, pengaturan pemanfaatan energi baru terbarukan sumber daya air dalam pembangunan PLTA Batang Toru Kabupaten Tapanuli Selatan. Kedua, pemanfaatan air sebagai energi baru terbarukan dan dampaknya bagi masyarakat dalam pembangunan PLTA Batang Toru yang kepemilikan mayoritasnya swasta. Dalam penelitian ini metode yang digunakan yakni doktrinal. Penelitian doktrinal menggunakan data sekunder sebagai data dasar dengan melakukan penelitian dan di dukung oleh data primer melalui wawancara kepada pihak terkait. Penelitian ini menyimpulkan bahwa dalam perkembangan regulasi EBT SDA di Indonesia dan Daerah belum sepenuhnya diatur, serta berorientasi pada aspek kemanfaatan EBT. Regulasi yang memengaruhi pelaksanaan EBT perlu disesuaikan dan diubah sehingga dapat meningkatkan pemanfaatan EBT, khususnya PLTA sebagai penghasil listrik yang beasal dari air. Listrik dan air adalah cabang produksi yang menyangkut hajat hidup orang banyak, oleh karena itu kekayaan alam harus dikuasai oleh negara sesuai dengan Pasal 33 ayat 3 Undang-Undang Dasar 1945. Adapun saran yang ditawarkan dari hasil penelitian ini adalah perlu meninjau kembali terkait aspek keekonomian pada sektor EBT, perlu dilakukan perninjauan kembali terhadap kontrak-kontrak PT PLN – IPP, pemerintah perlu dengan cermat melihat dampak pembangunan PLTA bagi masyarakat dalam serta menyoroti kepemilikan mayoritas cabang produksi yang menyangkut hidup orang banyak. ......The high demand for electricity in society to fulfill it requires water resources, because water in Indonesia is very abundant. However, in practice it is necessary to regulate the development of hydroelectric power plants (PLTA) which are included in the new renewable energy (EBT). The condition of the government is still limited so that cooperation between the government and the private sector is needed. Environmental awareness is often violated by the private sector/PLTA and can potentially cause problems in the availability of water resources for the community. So therefore it is necessary to see how the solution must be made by the government. The discussion of the problems in this study are: first, regulation of the utilization of new renewable energy in water resources in the construction of the Batang Toru hydropower plant, South Tapanuli Regency. Second, the use of water as a new renewable energy and its impact on the community in the construction of the Batang Toru hydropower plant, which is majority owned by the private sector. In this study the method used is doctrinal. Doctrinal research uses secondary data as basic data by conducting research and is supported by primary data through interviews with related parties. This study concludes that in the development of regulations on Natural Resources EBT in Indonesia and the Regions it has not been fully regulated, and is oriented towards aspects of the benefits of EBT. Regulations that affect the implementation of EBT need to be adjusted and changed so as to increase the utilization of EBT, especially hydropower as a producer of electricity derived from water. Electricity and water are branches of production that concern the livelihoods of many people, therefore natural resources must be controlled by the state in accordance with Article 33 paragraph 3 of the 1945 Constitution. The suggestions offered from the results of this study are that it is necessary to review the economic aspects of the EBT sector, it is necessary to review PT PLN - IPP contracts, the government needs to carefully look at the impact of hydropower development on the community and highlight the ownership of the majority of production branches which concern the lives of many people.