. Engineering and Contracting. onic dam on theOusatonic River, about 24 ft. high. Thesedams are still among the very largest in thestate; the drainage area at the first three damsbeing 459, 477 and 526 square miles, respec-tively, and at the latter dam 1,560 square \11 these dams were built on a rather poorgravel foundation. Stream flow data in this country were scarce plan calls for the base of the dam to be 1 the bed of the stream, and to be 15 including 1 ft. of concrete facing and15 ft. high. The crest is of granite blocks7%- ft. wide across the dam, inclining up-s
. Engineering and Contracting. onic dam on theOusatonic River, about 24 ft. high. Thesedams are still among the very largest in thestate; the drainage area at the first three damsbeing 459, 477 and 526 square miles, respec-tively, and at the latter dam 1,560 square \11 these dams were built on a rather poorgravel foundation. Stream flow data in this country were scarce plan calls for the base of the dam to be 1 the bed of the stream, and to be 15 including 1 ft. of concrete facing and15 ft. high. The crest is of granite blocks7%- ft. wide across the dam, inclining up-stream on a slope of 5 to 1. The apron is 22 ft. wide and is a crib ofthree layers of r2-in. timbers at right anglesto each other 6 ft. apart; the lower layer cutinto the bed of the stream and the others filledwith stone and covered solid with 12-in. tim-bers, laid parallel with the stream. The 7 timbers furtherest downstream had an up-stream slope of 6 ins. to keep standing wateron the apron. The form of the timber apron. S/7^ ^0/7^^. Fig. 2. in the 60s, and only the smaller streams had,as a rule, been developed. Accidents occurred in the building of theselarger dams that made Mr. Potters experi-ence more valuable than it would otherwisehave been. As the law does not require thatmembers of die State Board of Engineersshould report their doings to any one, there isno convenient way to find out how many,or what dams have been brought to their at-tention officially. From such plans as Mr. Pot-ter left among his papers, kindly loaned me byhis family, from my own personal knowledgeand from certificates on the Land Records ofthe various towns in the district, it appears was changed in 1885 to that shown in Fig. new apron had no back slope. About 200 ft. of this rollway went out inthe great freshet of 1886, and it was replacedby a timber dam, built in accordance withFig. 3. The new work is an immense timbercrib 200 ft. long, 68 ft. wide, and 24 ft. high,entirely filled wit
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