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Journal of Environmental Hydrology
ISSN 1058-3912 |
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Electronic Journal of the International Association for
Environmental Hydrology
JEH Volume 16 (2008), Paper 11 Posted March 27, 2008 THE RECHARGE TRENCH AS A SUSTAINABLE SUPPLY SYSTEM
S. Sunjoto
ABSTRACT The present day population of Indonesia is about 240 million. More than 30 percent live in urban areas under generally dense living conditions. Less than 50 percent of the urban population receives a drinking water supply for their domestic water needs. To get drinking water, most people withdraw shallow groundwater using dug wells. The storage of groundwater is decreasing due to over-exploitation. Also, infiltration of rainwater to replenish groundwater is also decreasing due to increased building density. One technique for water conservation and supply in urban areas is an infiltration system using recharge wells. In 1988 the author developed a computational formula to support this system. Similar formulas were also developed by the Public Works Department of the Government of Indonesia and the Bandung Institute of Technology. For areas with shallow groundwater, a recharge well is not highly efficient due to the small volume of storage available above a shallow water table. This paper proposes a more efficient horizontal recharge and supply system based on a recharge trench. A formula is developed analytically to calculate trench dimensions. A shape factor for the trench is proposed, based on previous shape factors of wells derived by the author. A system that combines recharge wells and recharge trenches can substitute for existing recharge well only supply systems. Due to their ability to conserve rainwater, these systems are true sustainable supply systems. Reference: Sunjoto, S. 2008. The recharge trench as a sustainable supply system. Journal of Environmental Hydrology, Vol. 16, Paper 11. CONTACT: S. Sunjoto Associate Professor Department of Civil Engineering and Environment Gadjah Mada University Yogyakarta, Indonesia E-mail: suny@tsipil.ugm.ac.id |
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