Bathrooms consume the vast majority of fresh water in any office building. To help save this precious resource, we flush our toilets and urinals with rainwater that is collected using a rainwater harvesting system. Here is how our rainwater harvesting system works:
- First, we collect rainwater runoff from our large, curved roof through gutters connected to downspouts, which are piped to an underground storage tank.
- Next, we store the collected rainwater in a 15,000-gallon underground storage tank for later use by the building. The system also utilizes a 1,500-gallon day-tank that serves up the rainwater to the building on-demand.
- Finally, we filter the rainwater using multi-media particulate and ultraviolet filters. Once filtered, the rainwater is pumped to our bathroom fixtures as needed. We also use this water to irrigate our indoor green roofs and living plant wall.
Through rainwater harvesting and the use of low-flow toilets, urinals and faucets, we have reduced our building’s fresh water usage by more than 75 percent.