. Engineering and Contracting. further, as shown by the profile, Fig. 4. Thelength of the dam along the crest is slightlyover 1,000 ft. The work comprises, then, two. Fig. 2—Section of Patillas Dam Near Center. and dam and some 3,800 cu. yds. of concretein core wall, tunnel lining, etc. The damstructure proper chiefly merits description. divisions, first the construction of the cutoflttrench and core wall, and, second, the em-bankment fill proper. shall be thoroughly and uniformly wetted bysprinkling carts or hose and nozzle, the amountof water used being just sufficient to secure thegi-eatest
. Engineering and Contracting. further, as shown by the profile, Fig. 4. Thelength of the dam along the crest is slightlyover 1,000 ft. The work comprises, then, two. Fig. 2—Section of Patillas Dam Near Center. and dam and some 3,800 cu. yds. of concretein core wall, tunnel lining, etc. The damstructure proper chiefly merits description. divisions, first the construction of the cutoflttrench and core wall, and, second, the em-bankment fill proper. shall be thoroughly and uniformly wetted bysprinkling carts or hose and nozzle, the amountof water used being just sufficient to secure thegi-eatest practicable compacting from the roll-ing. The rollers shall weigh not less than 1ton per lin. ft. of tread, and shall be made ofalternate large and small discs, whose differ-ence in diameter shall be 2 ins. and whosethickness shall be not more than 12 ins. Nobrush, roots, or other perishable material shallenter the back-flll. The material shall bebrought up uniformly on both sides of cut-offwall so as to avoid excess pressure againsteither side. Great care shall be exercised inrolling near the cut-off wall and immediatelyadjacent to the wall the compacting
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