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http://dx.doi.org/10.17663/JWR.2011.13.3.633

Analysis on the Potentiality of Domestic Rainwater Harvesting in Metro Manila  

Felix, Micah Lourdes A. (Dept. of Civil and Envi. Eng., Kongju National University)
Maniquiz, Marla C. (Dept. of Civil and Envi. Eng., Kongju National University)
Seo, Sung-Ho (Dept. of Civil and Envi. Eng., Kongju National University)
Kim, Lee-Hyung (Dept. of Civil and Envi. Eng., Kongju National University)
Jeong, Sang-Man (Dept. of Civil and Envi. Eng., Kongju National University)
Publication Information
Journal of Wetlands Research / v.13, no.3, 2011 , pp. 633-641 More about this Journal
Abstract
The Philippines is known for its abundant water resources such as the rainfall, where it has a mean annual rainfall range from 965 to 4,100mm. Due to the rapid urbanization of the country, the population in Metro Manila has been continuously increasing hence, the demand for a potable water supply also increases. To mitigate the scarcity of potable water supply, utilization of the water resources should be practiced. Rainwater harvesting is one way to utilize the rainfall runoff. This study analyzedthe potentiality of the rainwater harvesting on residential areas in Metro Manila. A water balance method based spreadsheet was used with input parameters including daily rainfall, catchment area, runoff coefficient, population and the water demand. The efficiency of the domestic water tank was analyzedusing the three different climatic conditions (i.e., minimum, median andmaximum annual rainfalls) and three different types of toilets (i.e., inefficient, conventional and dual-flush toilets). Furthermore, the overflow volume was used to determine which size of rainwater storage was more appropriate for the study area. The results of the study showed that for the three types of rainfall years, only the conventional and dual-flush toilets were suitable for the utilization of rainwater harvesting. The utilization of the $60m^3$ storage tank was sufficient for supplying the demandsof the 90 houses only for a small period of time, 3 months. Based from this study, to fully sustain the long-term water demand of the houses, the enlargement of the tank size having a capacity of 1,100 to $2,500m^3$ is ideal.
Keywords
Manila; Philippines; Rainfall; Rainwater harvesting; Water balance;
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