. Canadian engineer. st to Sully Crescent,through Pretties Ravine. Passing under Shaw Streetbridge, it goes east on Sully Crescent to Montrose Avenue,north to College Street, turning east on College Street toBeatrice Street and north on Beatrice Street to BickfordRavine, where it joins section No. 5 of main GarrisonCreek sewer. Design.—Owing to the decided difference between theelevation at the outlet and the elevation that was to beused at Sully Crescent, it was possible to design an sewer with a fall of i ft. in 108 ft., that was largeenough to take care of the volume of water
. Canadian engineer. st to Sully Crescent,through Pretties Ravine. Passing under Shaw Streetbridge, it goes east on Sully Crescent to Montrose Avenue,north to College Street, turning east on College Street toBeatrice Street and north on Beatrice Street to BickfordRavine, where it joins section No. 5 of main GarrisonCreek sewer. Design.—Owing to the decided difference between theelevation at the outlet and the elevation that was to beused at Sully Crescent, it was possible to design an sewer with a fall of i ft. in 108 ft., that was largeenough to take care of the volume of water that the fol-lowing sewers, 9 ft. 6 in. and 9 ft. 3 in. with a fall of i 300 ft., were capable of carrying. If a sewer of uniformsize and with a constant had been chosen from theinlet to the outlet its depth at College Street would havebeen much greater than the one constructed, thereby in-creasing the cost of construction, as the sewer was con-structed just at the bottom of a clav strata with wet sand. Fig. 5.—Meeting of Two Headings, Main Garrison CreekStorm Overflow Sewer, Section No. I. below. Had it been lower, the sand would have givenfar more trouble. Borings, which had been taken to ascertain the natureof the materials through which the sewer was to pass,showed a layer of v^et sand just above subgrade in someplaces and at spring line in others. It was thereforedecided that owing to the presence of the sand every pre-caution possible was to be taken against settlement, andthe sewer in the open cut was designed with a square con-crete base. In the tunnel section 1,090 lin. ft. were con-structed with a circular base owing to the absence of thesand, but in the last 700 lin. ft. the layer of wet sand cameinto prominence again, and on account of the method ofconstruction which will be described later, this portionwas constructed with square base. The sides were ex-cavated straight and planks placed to keep sand fromrunning in and thereby forming a cavity back
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