Conventional water resources such as groundwater and surface water are depleting

Conventional water resources such as groundwater and surface water are depleting. Either they are polluted, drying up, or just not sufficient enough to provide water supply for the people. Alternatively, methods like Rainwater harvesting and Water reclamation are used in lieu of sustainable water management. This way, conventional water resources can replenish and reduce the shortage of supply. (Andersson, et al., 2016)
Rainwater Harvesting is the process of collecting rainwater from rooftops or open spaces then keeping it for later use. The water collected can be used for agricultural needs such as irrigation and land management. It can also be used domestically, for household chores such as washing, flushing, laundry, and if properly sanitized, filtered, and treated, for drinking.
In a tropical country like Philippines, typhoons and storms are prevalent. However, in areas like Metro Manila, despite getting a fair share of rainfall, water shortage is still experienced. This is where rainwater harvesting comes in, since collecting rainwater and keeping it for later use will secure the water supply during summer, instead of letting perfectly usable water go down the drain and flood the streets during rainy seasons.
This system can be applied in almost any sectors that largely utilizes water, such as residential buildings, school grounds, factories, public buildings, and even farmlands. Currently in the Philippines, DPWH, as of 2016, is installing 187 rainwater collectors in public schools, and public markets where water is limited, in order to satisfy the increasing water supply demand and mitigate the frequent flooding in Western Visayas (PIA, 2016). On the other hand, cities like Quezon, Davao, Cebu, Mandaluyong, and Iloilo have implemented environmental programs and have adapted this system to preserve their current water resources (DOST, 2016).