The galvanized metal shed roof allows for a single rain gutter, which drains rain water off the roof, through filters, and into storage cisterns. Each cistern holds 7,000 gallons of rainwater. Re-using rainwater avoids the need for a massive city water infrastructure upgrade. The system provides all of the building's non-potable water, used for irrigation, fire suppression, hand-washing, mop sinks, gear washing, and laundry. It also decreases runoff to the adjacent Bay and Black Walnut Creek.
Photo credit: © David Hartcorn