. Engineering and Contracting . cting the man- Fig. S—Breaking Concrete Pavement 6-in. concrete base on Wood street was broken by droppinga 1-ton hammer on it, worked by the excavating derrick, iimsaverting the laborious process of breaking it with a sledge. AtBuckeye street the concrete base, owing to its inferior quality,was readily removed by the clamshell bucket. hole with the low^ ground east of Front St. serves the oldCrawfords Run drain age area. The outlet was closed bythe recently constructed levee, and a plain concrete circularsewer, 4 ft in diameter and 704 ft. long, has be
. Engineering and Contracting . cting the man- Fig. S—Breaking Concrete Pavement 6-in. concrete base on Wood street was broken by droppinga 1-ton hammer on it, worked by the excavating derrick, iimsaverting the laborious process of breaking it with a sledge. AtBuckeye street the concrete base, owing to its inferior quality,was readily removed by the clamshell bucket. hole with the low^ ground east of Front St. serves the oldCrawfords Run drain age area. The outlet was closed bythe recently constructed levee, and a plain concrete circularsewer, 4 ft in diameter and 704 ft. long, has been built todrain the areas mentioned, which total about 112 acres. Thissewer connects with the manhole referred to. and runssoutherly along Front St. to South Ave., thence westerly tothe river. The maximum flood stage to be expected at its out-let is elevation 585 ft. The elevation of the flowline at theupper end is ft. and the grade is per cent, the max-imum capacity being about 100 cu. ft. per second. This loca-. SECTION,A-A SECTION ON OF TUNNEL Fig. 4—Method of Tunneli (62) ig Under B. cS. O. R. R. Engineering and Contracting for March 10, 1920. 261 tion was selected with the idea of draining still another area,farther south, in the event of a storm sewer being built onSouth Ave. The crosssection of this sewer is the same asthat of the Wood St. sewer. There is a gate manhole at theintersection with the levee, back of which no openings wereplaced. Construction methods were the same as at the other sewers,but the trench was not completely backfilled because this por-tion of Front St. is within the limits of the spoil bank to befilled by the excavation from the river channel. The averagecut was about 12 ft., and the material removed consistedmainly of rubbish from the city dump. This part of Front never been paved. Excavation began Aug. Vi, 1919. andthe sewer was completed Oct. IS, 1919. The quantities con-sisted of 2, cu. yd. of earth excava
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