Rainwater Harvesting Tank Sizing: A Case in Urban Catchments in Metro Cebu

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