. Public works . E.\.TEHIOK OF CHKRRYVALE FILTER PLANT. 598 MUNICIPAL JOURNAL \. XXXVII, No. i; beds are washed once a day, compressed air and waterbeing used. The wash water averages about 3 per cent. The pumps which supply the filtered water to the dis-tribution system and standpipe consist of one 6-inch 2-stage turbine pump direct connected to a 100 horse-power3-phase 60-cycle 220-volt motor, and a 5-inch pump of thesame kind connected to a 70 horse-power motor, thesepumps working against a head of 275 feet. There is alsoa 6-inch single stage double suction pump direct con-nected to a 20 ho
. Public works . E.\.TEHIOK OF CHKRRYVALE FILTER PLANT. 598 MUNICIPAL JOURNAL \. XXXVII, No. i; beds are washed once a day, compressed air and waterbeing used. The wash water averages about 3 per cent. The pumps which supply the filtered water to the dis-tribution system and standpipe consist of one 6-inch 2-stage turbine pump direct connected to a 100 horse-power3-phase 60-cycle 220-volt motor, and a 5-inch pump of thesame kind connected to a 70 horse-power motor, thesepumps working against a head of 275 feet. There is alsoa 6-inch single stage double suction pump direct con-nected to a 20 horse-power 2-phase 60-cycIe 220-volt mo-tor, and a No. 1 Root blower connected to a similar mo-tor of 10 horse-power, for washing the filters. Both raw and filtered water are metered and the differ-ence in the readings of these meters gives the amount of. INTERIOR OF CHERRY VALE FILTER PLANT, wash water and waste. The old pumping plant can bestarted drawing from the lake in a few hours if necessaryand is retained as an auxihary supply. Meters are beinginstalled on all service pipes, about 50 per cent being me-tered at the present time. The cost of pumping twice is about $30 per milliongallons; the cost of the filter operator and the sulphateis $ per million gallons and all other expenses amountto $30; giving a total cost of $ per million gallonsdelivered to the consumer. For the above information we are indebted to the en-gineer of the water works, G. W. Pearse. USE OF CONCRETE IN WATER WORKSCONSTRUCTION.* This paper does not pretend to advance any new theo-ries, but is rather an effort to present in convenient formthe general principles involved in the use of concrete insuch structures as may be employed in connection withwater works. There is no recognized standard test orspecifications now in use for concrete. There has not
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