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Abstrak :
Indonesia adalah negara tropis yang memiliki dua musim, yaitu musim hujan dan musim kemarau. Selama musim hujan, beberapa daerah terkena banjir seperti Jakarta, Tangerang, Gresik, Jember, dan Semarang. Sementara pada musim kemarau, beberapa daerah mengalami kekeringan. Dua kondisi yang kontras ini terjadi setiap tahun. Kenyataannya, pola curah hujan di Indonesia, khususnya di pulau Jawa sangat cocok untuk pemanenan air hujan. Pemanenan air hujan telah diterapkan di berbagai Negara di dunia dengan tujuan untuk menyediakan sumber air yang diperuntukkan untuk kebutuhan air domestik, pertanian, bahkan peternakan. Pemanenan air hujan adalah metode sederhana dalam pengembangan sumber air yang memberikan keuntungankeuntungan seperti penyedia sumber air untuk kebutuhan rumah tangga dan juga mengurangi bahaya banjir yang diakibatkan intensitas hujan yang tinggi selama musim penghujan. Salah satu cara pemanenan air hujan adalah dengan menggunakan rain barrels.

Penelitian yang dilakukan adalah dengan menganalisa curah hujan yang terjadi di Fakultas Matematika dan Ilmu Pengetahuan Alam UI dan melihat peta penyebaran curah hujan tersebut serta merencanakan suatu panen air hujan sistem rain barrel di wilayah studi yang direncanakan untuk menampung sebagian dari curah hujan tersebut. Pengolahan data dilakukan dengan menggunakan teori-teori hidrologi dan menganalisa pemanfaatan rain barrel tersebut. Diharapkan dari hasil analisa tersebut dapat dipertimbangkan pembangunan rain barrel di Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia.

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Indonesia is a tropical country which has two seasons, i.e., wet and dry season. During wet season, some regions get flooded, such as Jakarta, Tangerang, Gresik, Jember, and Semarang. On the other hand, during dry season, some regions get drought. These two contrast situation happen annually. In fact, the rainfall pattern in Indonesia, especially in Java Island is suitable for rainwater harvesting. Rainwater harvesting has been practised in some places in the world to supply the water demand for domestic purposes, agriculture, as well as for livestock. Rainwater harvesting is a simple method in water source development which give some advantages such as supply the water demand for household and reduce the risk of flood caused by high rainfall intensity during wet season. Rain barrel is one rainwater harvesting option.

This paper discusses an analyze of rainfall run-off that happens in Faculty of Mathematics and Science University of Indonesia and sees the map of spreading rainfall runoff and also plan a rainwater harvesting rain barrel system in study region, which planned to accommodate some of this rainfall run-off. Data processing conducted by using theory of hydrology and analyze the benefits of using rain barrel in Faculty of Mathematics and Science University of Indonesia. Expected from the analysis result, can be considered to build rain barrel in Faculty of Mathematics and Science University of Indonesia.

Abstrak :
Ir. P. M. Noor reservoir, located in Riam Kanan Catchment (RKC), Banjar Regency-South Kalimantan Province, supplies water including for agricultural, energy, fishery, and domestic need. Due to increasing population and social welfare as well as development of all sectors, water demand has increasing. Meanwhile, the water availability remains constant and varies between dry and wet season. Those situations may create a conflict of interest among the water users. To avoid the problem, water allocation model for the reservoir is needed to manage the water availability. Water Allocation Model (WAM) development requires some inputs such as water requirement for all the users and water availability that comes from Riam Kanan river that flows to the reservoir. Generated inflow is also calculated by using Thomas and Fiering and its modification method. Standard Operating Rule (SOR) for the reservoir is developed based on water balance concept between water requirement and water availability. By using WAM, some scenarios for water simulation could be done. Evaluation of release discharge of the reservoir during 2000-2004 that related to its water requirement is also conducted. The results show that the WAM of the reservoir yields an efficient water allocation. The capacities of existing irrigation network can only serve for 11.000 hectare paddy field with reliability 96%. Meanwhile, the reservoir may serve for 35.000 hectare. Maximum electricity power generation is about 137.32 GWH/year. The evaluation of release discharge release with the reliability < 95%. However, by using water requirement for all the potential irrigation, the simmulation shows that the release with the reliability , 95% occur times.