Answered: What is the maximum population that can…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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What is the maximum population that can be served by an 8-in. sanitary sewer laid at minimum grade using a design flow of 400 gpcd (gallon per capita per day) and a flowing-full velocity of 2.0 ft/sec? (b) Compute the diameter of a storm drain to serve the same population based on population density = 30 persons per acre, coefficient of runoff = 0.40, 10-year rainfall frequency curve, a duration (time of concentration) = 20 min, and a velocity of flow = 5.0 ft/sec.

TABLE 1 Minimum Slopes for Various Sized Sewers at
a Flowing-Full Velocity of 2.0 ft/sec and
Corresponding Discharges
Sewer
Diameter
(n.)
10
12
15
18
21
24
Minimum
Slope
(1/100 ft)
0.33
0.25
0.19
0.14
0.11
0.092
0.077
0.066
0.057
0.045
27
30
36
*Based on Manning's formula with -0.013.
Flowing-Full Discharge
(cu ft/sec)
0.7
1.1
1.6
2.4
3.5
4.8
6.3
8.0
9.8
14.1
(ppm)
310
490
700
1080
1570
2160
2820
3570
4410
6330

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