Efisiensi Pemanenan Air Hujan pada Perumahan (Real Estate) Melalui Pembangunan Danau dalam Rangka Mengurangi Eksploitasi Air Tanah dan Limpasan Air ke Drainase di Kota Malang

Abstract

This study to provide open space in the form of a lake to infiltration as well as a rainfall harvesting on housing (real estate) ranging from home and residential area to address the water needs are increasing along with the development of the growing city of Malang. The purpose of this study was to use water during the rainy season excess, realizing an area of residential real estate that does not cause rainwater runoff into the environment outside the housing area. Absorb water back into the ground so as to minimize the decline in groundwater levels.Analysis of research methods used
to determine the topography of the study area. Analysis of the proportion of land use in the form of a green open space and space awakened. Hydrological analysis includes frequency analysis of rainfall, rainfall intensity calculations certain return period, and discharge plans. The results of this study can produce output on the volume of water that can be accommodated on a residential scale. With existing discharge on breadfruit beautiful cottage housing at 4:48 m3 / s in an open area and 41.59 m3 / sec in the region woke up and discharge a total of 46.07 m3 / sec. For a rainy day for 60 minutes to come by volume of 165,865.53 m3 of water. Housing Buring scenic for a rainy day for 60 minutes to come by water volume of 556,059.14 m3, Housing orange gem for a rainy day for 60 minutes to come by water volume of 106,484.48 m3, Housing Ijen nirvana for a rainy day for 60 minutes to come by water volume of 330,820.57 m3. The flow of rain water that flowed into the lake has an efficiency of 100% of the drainage, so it could be concluded that housing is not release rainwater drainage.