. Development and electrical distribution of water power . Fig. 81.—Dam and Power-house. oped in the Saco River and involves the construction of a dam about300 ft. long, 33 ft. in extreme height, and 28 ft. in width at the base,a 100 X 100-ft. power-house, a 40 X 100-ft. dynamo-house withfour units, turbines and other machinery required, a , a log chute, and a 50 X 300-ft. tail race. At the site the river has a width of 350 ft., an average depth of3 ft., and a velocity of about 6 ft. per sec. at ordinary stages of thewater. A 4-span highway bridge formerly crossed the river
. Development and electrical distribution of water power . Fig. 81.—Dam and Power-house. oped in the Saco River and involves the construction of a dam about300 ft. long, 33 ft. in extreme height, and 28 ft. in width at the base,a 100 X 100-ft. power-house, a 40 X 100-ft. dynamo-house withfour units, turbines and other machinery required, a , a log chute, and a 50 X 300-ft. tail race. At the site the river has a width of 350 ft., an average depth of3 ft., and a velocity of about 6 ft. per sec. at ordinary stages of thewater. A 4-span highway bridge formerly crossed the river about100 ft. below the present dam and slightly oblique to it, a crib dam WEST BUXTON PLANT I65 crossed the river about 50 ft. above it and connected at the east endwith an old grist-mill and other buildings which occupied the siteof the power-house. The dam is approximately perpendicular to the shore line and. CO 55O1—1HO w CO cuo w «Q 55 o H m H CO W O£ l66 DEVELOPMENT AND DISTRIBUTION OF WATER POWER nas a standard cross-section with curved crest and ogee face down-stream, a vertical face upstream, and a depressed footing or cut-off wall at both the up and downstream longitudinal edges of thefoundation. The west end of the dam makes an oblique angle witha concrete abutting wall which it intersects and with which it isintegral; the footings of this wall are carried down to rock and ithas a maximum height of 10 ft. with a top width of 3 ft. It ex-tends about 100 ft. upstream from the dam to intersections with themaximum flow lines of the impounded water and is carried up to aheight of 8 ft. above the crest of the dam, thus concentrating allflow over the crest of the dam and protecting the bank on the down-stream side. The wall was built in an open cut with 1 :1 slopesand was back-filled on the shore side, the river side being left un-filled and excavated near the dam to a depth of 3 ft.
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