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<br />are shown on plate 14. All joints were provided with concrete alignment collars, <br /> <br />copper seals, and asbestos fiber bituminous mastic material. <br /> <br />STILLING BASIN <br /> <br /> <br />The stilling basin for the three conduits is a reinforced concrete structure <br /> <br />165 feet long with a trapezoidal width varying from 40 feet near the conduit to <br /> <br />83 feet at the downstream end. The structure is shown on plate 15. The water <br /> <br />enters the basin over a parabolic drop which is 20 feet high and 75 feet long. <br /> <br />The floor of the stilling basin is at elevation 5480 feet m.s.l., is 90 feet <br /> <br />long, has two rows of 3-foot-high baffle blocks and an end sill. The walls of <br /> <br />the stilling basin are at elevation 5505 feet m.s.l. Training walls, 2 feet <br /> <br />lower than the outside walls, separate the three conduits and end about 45 feet <br /> <br />from the end of the stilling basin. The floor slab is 2.5 feet thick through the <br /> <br />drop section and 4 feet thick through the level portion, Uplift beneath the slab <br /> <br />is controlled by an 18-inch blanket of well graded sand and gravel directly under <br /> <br />the slab. The blanket is drained by 6-inch perforated vitrified clay pipes which <br /> <br />run transversely under the slab at intervals and discharge back into the stilling <br /> <br />basin through the walls. <br /> <br />The entire slab is anchored into the Denver Formation with 1-1/4 inch square <br /> <br />reinforcing bars grouted into 6-inch-dismeter drilled holes ranging in depth from <br /> <br />15 to 20 feet below the bottom of the slab. Spacing of the anchors varies from <br /> <br />5 to 10 feet on centers. <br /> <br />SPILLVAY <br /> <br />The Cherry Creek spillway, if used, would transfer flows into the Toll Gate <br /> <br /> <br />and Sand Creek drainage basins via Meaoowbrook Creek and West Toll Gate Creek. <br /> <br /> <br />When Cherry Creek Dam was built, these basins were primarily undeveloped <br /> <br /> <br />agricultural lands. Flowage easements were not acquired along Toll Gate Creek <br /> <br />because of the undeveloped nature of the land use at the time the dam was <br /> <br />constructed. Presently, the land adjoining the Toll Gate Creek tributaries <br /> <br /> <br />downstream of the spillway is approaching full urbanization, The spillway was <br /> <br /> <br />originally excavated to elevation 5598 feet m.s.l. with a 67-foot bottom width <br /> <br />12 <br />