. Electrical world. ition as the top of the main dam. Thefloor of the opening closed by this gate is ft. below the crest ofthe main dam, so that by lowering this gate an opening from nothingup to 16 X := 40 sq. ft. may be provided for water that is justup to the crest of this dam. * The Housatonic River is subject to severe freshets, owing to therapid descent of its bed and the precipitous nature of the territorythrough which it flows. To provide for these freshets the largecapacity of spillways, flush gates and waste gates has been the river is only moderately full its entir
. Electrical world. ition as the top of the main dam. Thefloor of the opening closed by this gate is ft. below the crest ofthe main dam, so that by lowering this gate an opening from nothingup to 16 X := 40 sq. ft. may be provided for water that is justup to the crest of this dam. * The Housatonic River is subject to severe freshets, owing to therapid descent of its bed and the precipitous nature of the territorythrough which it flows. To provide for these freshets the largecapacity of spillways, flush gates and waste gates has been the river is only moderately full its entire flow is intended topass into the rock cut of the canal which has an area in cross sec-tion of 375 sq. ft. up to the normal flowage line, which is on a levelwith the top of the smaller dam. but is two feet below the top of themain dam. When the river has risen to just the crest of the maindam, the cross section of water discharged over the smaller damwill be 2 X 150 = 300 sq ft. Opening the flush gate adds X 16. -ENTR-\.\CE gates IN FRONT. FLUSH AND fej .\t right. = 40 sq. ft. to this discharge area, and full opening of both the wastegates gives 8 X 10 X 2 ^ 160 sq. ft. more. The total of thesedischarge sections amounts to 500 sq. ft., to which must be X 2 = sq. ft. to account for the rise of 2 ft. in the flowageline of the canal. It thus appears that the total cross section ofdischarge in time of freshet may be + 375-0 =^ sq. ft.,or nearly times the normal canal area of discharge, before anywater goes over the main dam. As the freshet water rises abovethe crest of the main dam, the length of the discharge line, over andabove the openings at the discharge gates, becomes 150 ft. for thesmaller dam, plus about 200 ft. over the main dam, plus the 200 spillway at the side of the canal next to the waste, plus the 16 the flush gate, a total of 566 ft. The canal entrance gates set squarely across the entrance chambernext to but at nearly
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
