Abstract
Rainwater is an abundant resource in the Philippines and when properly collected and managed, can help address flood problems. Rainwater harvesting has been practiced for years and has been viewed as one of the better options for flood mitigation in urban areas compared to other storm water management practices. It does not require large land area and cost per area is high in these locations. However, there is a challenge in selecting the suitable tank size. This paper investigates if the increase in stormwater runoff brought about by the changes in landuse in urbanized catchments can be represented by a single coefficient similar to what is being presented in the Philippine Green Building Code and in other local ordinances in the country. Simulations through HEC-HMS of three urban catchments in Metro Cebu showed that the increase in volume is highly varying such that the coefficient produced for each catchment was so distinct that no single average coefficient can be drawn. Thus, analysis should be catchment-based to determine the suitable tank size in rainwater harvesting systems as an option for flood mitigation.
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Schedule a callMore From: IOP Conference Series: Earth and Environmental Science
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