. Journal of the New England Water Works Association . ly. I wont say that we consider it the best, I do not —butwhat we use is ordinary wicking that has been boiled in edible tallow. Mr. Flinn. We use granulated cork for packing, and have for tenyears. * Civil Engineer, Philadelphia, -Mechanical Engineer, Boston, Mass. PRATT. 457 THE DEEP CORE-WALL OF THE WANAQUE DAM. BY MAJOR ARTHUR H. PRATT.*[Read September IS, 1922.] The Wanaque Dam, under construction by the North Jersey DistrictWater Supply Commission, will impound the waters of the Wanaque River,one of the tributaries of the Passai
. Journal of the New England Water Works Association . ly. I wont say that we consider it the best, I do not —butwhat we use is ordinary wicking that has been boiled in edible tallow. Mr. Flinn. We use granulated cork for packing, and have for tenyears. * Civil Engineer, Philadelphia, -Mechanical Engineer, Boston, Mass. PRATT. 457 THE DEEP CORE-WALL OF THE WANAQUE DAM. BY MAJOR ARTHUR H. PRATT.*[Read September IS, 1922.] The Wanaque Dam, under construction by the North Jersey DistrictWater Supply Commission, will impound the waters of the Wanaque River,one of the tributaries of the Passaic River, at a point about 25 mi. northof the city of Newark. The Wanaque Reservoir, which will supplementthe present Pequannock River supply for Newark and will also serve otherneighboring municipalities, will impound between 11 000 and 27 000 milliongal., giving a safe yield of 50 to 100 , depending upon the needs ofthe municipalities which decide to enter the project. The reservoir willbe about 6 mi. long and 1 mi. wide. SOUTH END NORTH END. 8 7 6 Stcrhons Longitudinal Profile of Wanaque Dam Site. The site of the dam is across a valley about 1 500 ft. wide which isto be closed by means of an earth dam having a concrete core-wall extendingto bedrock which outcrops on both hillsides but at the bottom of t he valleydips to about 100 ft. below the surface. The rock is gneiss and the over-burden is water-bearing sand and gravel. The present channel of theriver crosses the site of the dam near the south end and the river tiedis partly on the ledge rock which gradually clips away from the riverto the deepest place near the middle of the valley. The method adoptedfor constructing the core-wall was to drive two walls of steel sheet pilingacross the valley, excavate between them, meanwhile bracing the steelsheeting with timber, and then fill the trench, with concrete. The type !sheeting used was the Lackawanna, arch-web, 35 11). section. Previousto putting down the sheeted tren
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