. Journal of the New England Water Works Association . ir and to insure keeping this area flooded when the mainreservoir is drawn down, and to provide, before the completion of the newproject, some storage which could be sent down the river, if and as needed,to the present Pettaconset Pumping Station, a structure known as theRegulating Dam was designed and built in 1918 at the village of NorthScituate. The dam floods an area of about 210 acres to a maximum depthof about 12 ft., with an average depth of about 5 ft. at Elevation 284,the level of Scituate Reservoir. In order to increase the capac
. Journal of the New England Water Works Association . ir and to insure keeping this area flooded when the mainreservoir is drawn down, and to provide, before the completion of the newproject, some storage which could be sent down the river, if and as needed,to the present Pettaconset Pumping Station, a structure known as theRegulating Dam was designed and built in 1918 at the village of NorthScituate. The dam floods an area of about 210 acres to a maximum depthof about 12 ft., with an average depth of about 5 ft. at Elevation 284,the level of Scituate Reservoir. In order to increase the capacity tempor-arily the reservoir has been maintained generally at Elevation by18-in. flashboards, thus providing a storage of about 420 000 000 gal. whichhas been available if and as needed at Pettaconset since the spring of dam as shown on the accompanying photograph is circular in planand of a true arch type. The radius of the upstream edge of the dam is50 ft. and the ends near the highway connect with the abutments of the WTNSOR. 331. 332 THE NEW WATER SUPPLY OF THE CITY OF PROVIDENCE. new Danielson Pike Bridge by reverse curves. The spillway has a netlength of about 220 ft., the concrete crest being at the same elevation asthe crest of the spillway of the Scituate Reservoir about 6 mi. below. Thedam is mainly on coarse sand and gravel and water-tightness was securedby placing a blanket of soil and subsoil 2 ft. thick, rolled in thin layers,outside the wall of the dam for a radial distance of 75 ft. The concretesection except at the abutments and gate chamber, is L shaped being 15 and vertical on the water face and 10 ft. wide on the bottom. Thethickness of the wall at the spillway level is 30 in., and 12 ft. down, 42 in.,this being the level of the concrete apron which forms the horizontal partof the L and which is 3 ft. thick. The water falls over the spillway anddrops 12 ft. on to the concrete apron, which is 6 ft. 6 in. in width. Thebottom is furthe
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