. Comparative designs of Gravity and Ambursen dams. from it, so that it add to thelever arm of the gravity force and increases themoment against overturning. The total thickness thru the dam at the basemeasures 84 feet from the heel to the end of thetoe. The total cross-sectional area is then2350 ^ An S x9* tunnel running the length of thedam is to be constructed at Elevation 3968 witha ,Olfo grade, and a lOxlO* stair-well builtnear the gate house which will provide accessto the tunnel and permit regular inspection. The gate house is to be built on thebulwark directly over the intakes w
. Comparative designs of Gravity and Ambursen dams. from it, so that it add to thelever arm of the gravity force and increases themoment against overturning. The total thickness thru the dam at the basemeasures 84 feet from the heel to the end of thetoe. The total cross-sectional area is then2350 ^ An S x9* tunnel running the length of thedam is to be constructed at Elevation 3968 witha ,Olfo grade, and a lOxlO* stair-well builtnear the gate house which will provide accessto the tunnel and permit regular inspection. The gate house is to be built on thebulwark directly over the intakes which are tobe set flush with the face of the dam. Two 8 X 8* sluice gates are to be pro-vided to insure safety against floods and whichwill aid materially in passing off excess waterat the time of construction. These sluice gatesare to be made of heavy cast iron slabs,strength-ened and suprorted by ribs and arranged to slidein a strong iron frame on the upstream face of -47- UrDf?m/uc ^*ry*f £i£v. ^ J?^jy \ -47a- •ST-Ofi - Lo^s Tk/^s/^^Tcj^fC. jnjty: f~3^&^ ^3kcT/o/v y^r //ey/rKjH -47b- the dam. The sliding surfaces being facedwith bronze strips. These gates are to beoperated by a hydraulic rum system placedabove them on the face of the dam. The volume of the spillway section is£50x2350=588000 or 21800 The volume of the bulkhead sections isestimated at 690000 or 26500 cu. volume —21800f26500-48300 : 71500 Tbbls. of cement21900 cu. sand43500 of broken rock wouldbe required. It is estimated that 2140 of rockwill need to be excavated for the foundation. ?4 The rest of the rock for the rubble must beeither excavated from the sides of the riveror imported from other sources. The specifications for this dam willread the same as those that follov? with theexception that instead of broken stone, brokenrock excavated mainly at the site and of asize up to nigger-heads shall be used. IJosteel of course is necessary in
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