i. Pipe size. Minimum pipe size 8 in. ii. Slope of each pipe section. It must be greater than the minimum slope and be

[answerhappygod]

i. Pipe size. Minimum pipe size 8 in.
ii. Slope of each pipe section. It must be greater than
the minimum slope and be close to the ground slope to minimize
excavation.
iii. Velocity in each pipe. It must be greater than 2.5 ft./s
and less than 6 ft./s.
iv. Water depth. It should be between 1/2 and 2/3 of the pipe
diameter.
v. Invert elevation of each pipe section at upper manhole and
lower manhole. Assume minimum depth of 6.5 ft. to crown of
the pipe and in Manhole 7 upper stream pipe diameter is 12-inch and
crown elevation is at 107.1 ft. (Show calculation results on
spreadsheet.)

I Pipe Size Minimum Pipe Size 8 In Ii Slope Of Each Pipe Section It Must Be Greater Than The Minimum Slope And Be 1 (60.83 KiB) Viewed 28 times

Manhole Street El. I 101.3 2 104.18 3 105.33 4 107.25 5 109.23 6 112.19 7 116.6 8 112.04 115.04 117.46 113.77 110.29 115.8 111.92 108.58 116.37 112.57 108.89 9 11 12 13 14 15 16 17 18 A-10 13 115 To treatment plant FIGURE 3 Sewer system for Example 2. A-8 A-6 A-7 A-5 121 A-11 A-4 A-2 A-12 118 Stream 9 10 A-3 1 A-13 117 16
33 A sewer system is to be designed for the urban area of Figure 3. Street elevations at man- hole locations are shown on the figure. It has been determined that the population density is 50 persons per acre and that the sewage contribution per capita is 100 gpd. In addition, there is an infiltration component of 658 gpad. Local regulations require that no sewers be less than 8 in. in diameter. Assume an n value of 0.013.