The rain that pays for itself

Jerusalem has approximately 896,112 sq.m. of roof space on public buildings, which could yield a water saving of 384,253 cu.m. annually.

March 30, 2017 13:00
2 minute read.
Israel finance

Years until the Savings Equals the Investment. (photo credit: JERUSALEM INSTITUTE FOR POLICY RESEARCH)

Atop a 1,000-sq.m. roof of a school building, rainwater runs into gutters at the perimeter. Through the gutters, the water flows into a large reservoir, connected to the school’s toilets by a separate line to avoid cross connections with city water.

A pressure switch activates only upon a toilet flush in the school bathroom, causing the water to flow once again and refill the toilet.


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