Abstract
Increasing demand of housing facilities has an impact on the change of land function of an area that originally forest or garden turned into a residential area. Unbalanced water surface and ground surface are the effect of the unbalanced hydrologic cycle. Volume increased and runoff, infiltration capability and groundwater decreased levels are due to hydrological cycle imbalances. That is why water management is needed in order to create a balance of water resources. One way to realize the idea is to apply rainwater harvesting methods to a residential area that is a method of collecting rainwater that is stored in a storage tank for then the water that has been collected can be reused as an alternative source of clean water. The purpose of this research is to aims the potential of rainwater that can be harvested in G-Land Padalarang Housing area, so it can be used as a source of clean water as well as efforts to maintain groundwater availability and balance of hydrological cycle. The method is by using rational method. The data used are primary data and secondary data which then analyzed based on hydrologic and hydraulics analysis. From the analysis result, by applying rainwater harvesting method in G-Land Padalarang Housing area, the volume of water that can be harvested with rainfall 2,929 mm / year and the catchment area of 66 m2 is 173,983 liter / year and can save ground water usage of 52 % of total needs.
Highlights
Increasing demand of housing facilities has an impact on the change of land function
originally forest or garden turned into a residential area
Unbalanced water surface and ground surface are the effect of the unbalanced hydrologic cycle
Summary
Semakin meningkatnya permintaan sarana perumahan akan berdampak terhadap perubahan fungsi lahan dimana kawasan yang awalnya hutan atau kebun berubah menjadi kawasan perumahan, sehingga berdampak terhadap tidak seimbangnya siklus hidrologi. Dampak yang dtimbulkan diantaranya tidak seimbangnya antara air hujan, air permukaan dan air tanah sehingga akan meningkatkan volume dan laju limpasan permukaan, menurunnya kemampuan infiltrasi dan menurunnya permukaan air tanah. Air menjadi terlalu banyak dimusim hujan, dan terlalu sedikit dimusim kemarau. Untuk itulah dibutuhkan manajemen air agar dapat terciptanya keseimbangan sumberdaya air, Salah satu cara untuk mewujudkan gagasan tersebut adalah dengan menerapkan metode pemanenan air hujan (rainwater harvesting) pada suatu kawasan perumahan, yaitu metode pengumpulan air hujan yang ditampung dalam suatu tangki penyimpanan untuk kemudian air yang telah dikumpulkan dapat dimanfaatkan kembali sebagai alternatif sumber air bersih serta upaya untuk menjaga ketersediaan air tanah dan keseimbangan siklus hidrologi. Dari model tersebut diharapkan dapat diusulkan suatu penerapan model pengembangan kawasan perumahan yang menggunakan metode rainwater harvesting secara berkelanjutan untuk masa yang mendatang
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