NOTES 200 300 400 500 DISCHARGE CUBIC FEET PER SECOND Discharges are based on a canal water surface of 2705.0. 600 700 UNITED STATES 800 Figure 19.--Canal outlet works discharge curves. distribution was investigated and was found to be nearly uniform with a maximum base pressure intensity of 3, 500 pounds per square foot, which is well within the safe bearing capacity of the foundation material. The vertical shaft and the 900 bend were reinforced as needed to withstand the stresses produced by the assumed loadings. Allowable stresses for 3,000-pound concrete were used in the design. (c) Trashracks. -- The five trashrack sections for the canal outlet works intake structure are each approximately 8 feet 3 inches wide by 7 feet 7 inches high. Each section consists of 2- by 5/8-inch trash bars supported by 8- by 1-1/4-inch horizontal plates. The ends of the horizontal plates are attached to vertical side members. The open space of 4-7/8 inches between trash bars is considered adequate protection for the high-pressure gate. The trashracks were designed for a differential head of 40 feet and a stress of 33,000 pounds per square inch. 27. Pressure Conduit. - The 5.5-foot-diameter pressure conduit mentioned in section 25 extends from the intake structure to approximately station 4+68.00. The conduit is about 208 feet long and is divided into five 28-foot sections and one 36.5-foot section, connected by 4.5-foot closure sections. Each of the six sections is provided with a cutoff collar. A reach of the conduit is shown in figure 20. Figure 20.--Pressure conduit of canal outlet works. Workmen are compacting backfill adjacent to conduit. 328-701-3295, November 23, 1951. - (a) Loadings. In the design of the pressure conduit, vertical loads were considered equal to the weight of the embankment above the centerline and distributed uniformly. Lateral loads were assumed to have a trapezoidal distribution and be equal to one-third of the vertical load at any elevation. The following loading conditions were investigated: (2) Embankment saturated to phreatic line for normal reservoir water surface elevation; conduit filled with water and reservoir water surface at elevation 2785.0. |