Answered: During the Storm sewer system (design…

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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Question

During the Storm sewer system (design for sewer pipes) shown in the figure 1 below using rational method. The sub-area data is provided in table 1 and table 2. At the project site, intensity is given by the equation

i = 20.2 / t_d^0.52

The intensity in in inches/hr and t_{d =}storm duration = time of concentration in minutes.

Assume circular pipes are used for storm sewers. The pipe roughness (Manning's n) is given by n = 0.012

1
Design the Storm sewer system (design for sewer pipes) shown in the figure 1 below
using rational method. The sub-area data is provided in table 1 and table 2. At the
project site, intensity is given by the equation
1=20.2/(²)
The intensity is in inches/hr and ta storm duration time of concentration in minutes.
Assume circular pipes are used for storm sewers. The pipe roughness (Manning's n) is
given by n=0.012
Table 1.
Subbasin
Area (acres)
Rational coefficient.
td (in min)
1
2.0
0.6
15
2.0
0.7
18
1.5
0.8
22
3
4

Sub-area 3
1
no
levet
www
C
Runoff
Inlet
Sub-area 1
Hope
Sub-area 4
Storm sewer
2
DAN
D
dove
B
Down
on
23 M

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