Reservoirs on Steep Hillside
The source of supply and the manner in which the water system is being installed in subdivision No. 2 of Fairfax Manor, at Fairfax. Marin County, is proving of interest to engineers. The steep hillsides, rising to an elevation of 750 feet above the source of supply presented an apparently unsurmountable obstacle to Engineer Prentiss Gray when the proposition was first confronted. Water is supplied to subscribers by the gravity system. The proposition of coping with the hillside was met by building three reservoirs at regular intervals of 250 feet in elevation, making three reservoirs or tanks. Installed at each tank is an electrically-driven pump, which is governed by an automatic device that sets it in operation when the water in the tank above it sinks below a certain level. The operation is stopped by the same means and the controls are governed by a common automatic apparatus which shuts off the power when any one of the pumps runs longer than a given time. Every provision is being made’for efficiency, and the water will be taken from wells at the foot of the hill.