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http://dx.doi.org/10.17663/JWR.2013.15.2.223

Analysis on Rainwater Harvesting System as a Source of Non-Potable Water for Flood Mitigation in Metro Manila  

Necesito, Imee V. (Department of Civil and Environ. Eng., Kongju National University)
Felix, Micah Lourdes A. (Water Resources and Environmental Department, Korea Institute of Construction Technology)
Kim, Lee-Hyung (Department of Civil and Environ. Eng., Kongju National University)
Cheong, Tae Sung (Research Planning Department, National Disaster Management Institute)
Jeong, Sangman (Department of Civil and Environ. Eng., Kongju National University)
Publication Information
Journal of Wetlands Research / v.15, no.2, 2013 , pp. 223-231 More about this Journal
Abstract
Excessive precipitation, drought, heat waves, strong typhoons and rising sea levels are just some of the common indicators of climate change. In the Philippines, excessive precipitation never failed to devastate and drown the streets of Metro Manila, a highly urbanized and flood-prone area; such problems are expected to occur frequently. Moreover, the water supply of Metro Manila is dependent only to Angat Reservoir. Rainwater harvesting can serve as an alternative source of raw water and it can mitigate the effects of flooding. The harvested rainwater can be used for: potable consumption if filtered and disinfected; and non-potable consumptions (e.g., irrigation, flushing toilets, carwash, gardening, etc.) if used untreated. The rainfall data were gathered from all 5 rainfall stations located in Metro Manila namely: Science Garden, Port Area, Polo, Nangka and Napindan rain gauge stations. To be able to determine the potential volume of rainwater harvested and the potentiality of rainwater harvesting system as an alternate source of raw water; in this study, three different climatic conditions were considered, the dry, median and wet rainfall years. The frequent occurrence of cyclonic events in the Philippines brought significant amount of rainwater that causes flooding in the highly urbanized region of Metro Manila. Based from the results of this study, the utilization of rainwater harvesting system can serve as an alternative source of non-potable water for the community; and could also reduce the amount of surface runoff that could result to extreme flooding.
Keywords
Climate change; Excessive precipitation; Flooding; Metro Manila; Philippines; Rainwater harvesting; Water management;
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Times Cited By KSCI : 1  (Citation Analysis)
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