Author : Sobremisana, Marisa; Sobremisana, Antonio Gabino; Jasper; Veluz, Simplicio

Summary : Rainwater harvesting (RWH) is an existing technology proven to be effective in reducing pressure on water resource, yet often overlooked by planners, engineers, builders and decision-makers as a
viable alternative for supplying water to households and businesses while reducing stormwater runoff in urban settings. RWH tanks are commonly made of concrete, plastic, stainless steel,
ferrocement or earthen jars. In this study, the use of collapsible rubber tanks (CRTs) as an alternative storage container for RWH was explored. The study was conducted in Barangay La Mesa, Calamba City, Philippines. This barangay uses rainwater for domestic use. Bladder or pillow, rectangular and square-type designs were installed, tested and monitored in terms of ease of use and handling.

The portability of the tank makes it an attractive option in an urban setting where space is limited
and land is expensive. A CRT with 500-800 liter capacity can be used by a five-member household
for three days for their basic water needs, and comes at an affordable price range of PhP 3,500-
5,000 (USD 65-95). With proper handling and maintenance, the CRT can be a good alternative
for rainwater storage and serve other purposes. It can be useful in hard-to-reach areas particularly
during emergency situations and relief operations.