Answered: Storm sewer system is to be provided to…

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

Storm sewer system is to be provided to drain storm water to protect urban areas from flooding after episodes of rainfall. Storm sewer layout along with the contributing areas drained in specific sewer lines is shown in Figure. Design the storm sewer system for “gravity flow” using the data given in Table assuming that the entry time to the pipe is the same for all sections and is equal to 6 min. All pipes are circular and made of concrete. All areas are in hectares.

Gradient	End of Run	Head of run	Length of Sewer ‘m’	Sewer Name
1.5%	M2	M1	67	SS1
%2	M3	M2	87	SS2
2%	M4	M3	87	SS3
2.5%	M5	M4	77	SS4

Data of attached Layout of storm

C1=0.57

C2=0.67

C3=0.77

C4=0.47

C5=0.87

A1=3 ha
A2=7 ha
C=0.5X
C2=0.6X
A3=5 ha
M1
C;=0.7X
SS1
SS2
M3
M2
A4=4ha
C4=0.4X
As=8 ha
Cs=0.8X
M4
M5
Outfall
Figure Q2- Layout of storm sewers
SS4
SS3

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