The Potential of Rainwater Harvesting as an Optional Water Supply of Building XYZ

Abstract

Harvesting rainwater to supply the water demands is a growing trend as a viable option to augment the water supply system in the Philippines. Increasing water demand has triggered an initiative to look for an alternative water supply providing sustainable water management. The paper aims to assess the rainwater harvesting potential and storage requirement for the operation of building XYZ. Rainwater harvesting potential for the building will be quantified using a 10-year worth of rainfall data from the Philippine Atmospheric, Geophysical, and Astronomical Services Administration (PAGASA). The average annual rainfall in Metro Manila is 2785.6 mm. Building XYZ has a roof area of approximately 500 sqm. The researcher shall identify the rainwater harvesting potential of the residential building XYZ located in Metro Manila Philippines and conduct a water demand forecast using a naïve forecasting model. The water demand of building XYZ was forecasted by utilizing a naïve forecasting method that resulted in an absolute percentage error of 16.23%. The rainwater harvest could provide 15 toilet flushes during the driest season and 320 toilet flushes during the rainy season in each unit of building XYZ.