Engineering and Contracting . .j-ft. sluicewayshave a total discharge capacity of The crest is equipped with automaticdashboards 28 ft. long and G ft. high, hingedat the dam crest. Each flashboard is pro-vided with a heavy cylindrical reinforcedconcrete counterweight located above water,and rolling on a curved track at the bridge lircly in all calculations of stability. Xo pro-vision is made for upward hydrostatic pres-sure, but, to offset this possibility, the weightof the bridge, piers, fiashboards and flash-board counterweights, are not taken into ac-count, in the consid
Engineering and Contracting . .j-ft. sluicewayshave a total discharge capacity of The crest is equipped with automaticdashboards 28 ft. long and G ft. high, hingedat the dam crest. Each flashboard is pro-vided with a heavy cylindrical reinforcedconcrete counterweight located above water,and rolling on a curved track at the bridge lircly in all calculations of stability. Xo pro-vision is made for upward hydrostatic pres-sure, but, to offset this possibility, the weightof the bridge, piers, fiashboards and flash-board counterweights, are not taken into ac-count, in the consideration of the stability ofthe structure against overturning, sliding orshearing. With the reservoir at maximumelevation, there is no tension in the upstreamside of the dam, and the maximum comores-sion at the toe does not exceed 12 tons persquare foot. The curvature of the dam was made such-as to avoid the use of curved concrete formsduring construction, and offsets of 6 ins. wereprovided every 10 ft. at the upstream side to. Fig. 1. General Plan of Concrete Intake Dam, Tallulah Falls Hydro-Electric Development. months, and, on account of its location andduty is known as intake or diverting dam serves the double duty of adding100 ft. to the natural head of 500 ft. on theplant and of raising the water to the tunnel which has been driventhrough the solid rock, 6,C65 ft. to a forebayor surge reservoir, at the head of the pen-stocks. It also forms a storage basin 1V4miles long, the capacity of which is ,-000 cu. ft., 60,000,000 cu. ft. being availablefor the immediate demand of the waterwheels. The drainage area above the dam is 102square miles, most of which is well timbered,and with steep slopes, and the annual rainfall varies from TO to 80 ins. During con-struction, the river flow has varied from 200to 15,000 .sec. ft., the average flow being about450 sec. ft. During floods of 8,000 sec. more, which seldom last more than , the riv
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