NEW WATER SUPPLY AT TACOMA.
Tacoma, Wash., is installing a waterworks pumping plant, which will be entirely different irom any other in the State of Washington and is constructed on an entirely new model. The water will be derived from deep wells and a pressure maintained through the use of compressed air and water tanks. By this method of distribution absolute purity is guaranteed, the water never being exposed to the air until it flows from the faucets of the houses it supplies. The t_____mperaturc can be kept ten degrees lower than in other systems and a heavy pressure maintained. Special provision will be made for fire protection. The first well is now being drilled, it has an 8-in. bore and will be sunk about to the 200-ft. level and will be similar to the city wells at South Tacoma. A special pump has been ordered from Cedar Rapids, la., which raises the water to the surface and forces it into a strong steel tank where a pressure of too lbs. is maintained. Air is forced into the tank with the water in a fixed percentage. The first of these tanks, which is on the ground and has been installed, is small and for preliminary use. It is 10 ft. in length and 5 ft. in diameter. Later units will be larger, and as many can be added front time to time as the demand for water requires. The first tank is to be set on the surtace of the ground, covered with a roof, for the inspection of the public. Others will be buried underground, in order to get them out of the way and at the same time to keep the water cooler. A large number will be installed within the next year or two by the Narrows Land company. A gasoline engine will be used to operate the pump lor the system at present. Other power may be utilised later. Auxiliary tanks, containing nothing but pure air at a heavy pressure, will be installed for fire protection. When an alarm is turned in, a stopcock will sw’itch this extra pressure into the water tank. An order has also been placed for the first water mains which the company will lay in the addition. They will be similar to those laid by the city, being 6-in. stave pipe. The first order is for 3,000 ft. The system is believed to be the best that could be used for the tract in question. There is not another like it in Washington. More than 7,000 such tanks are in use in Eastern States, however, and they nave proved highly successful. The water is kept at a pressure of 100 lbs., which corresponds to a 240 ft. head. The mains are being made heavy enough to withstand it. The average pressure in Tacoma is about 30 lbs.