2. 1
In this training section, you will design different types of
conduits
Types of each conduit will be replaced by open channel flows,
gutters, and pipelines based on your constructed SWMM file
You will learn and check what values are needed to design
conduits in SWMM
You will learn how to determine the smallest diameter of
pipelines with the design rainfall data
1
4. 3
T= 12 mins T= 54 mins
T= 2hr 14mins T= 6hrs 3mins
5. 4
Change the type (shape) of
the link element
Click conduits from the
side menu and then select
a conduit
4
6. 5
Change the type (shape) of the link
element
Properties for the selected
conduit will appear in the
screen
Click shape
5
7. 6
Change the type (shape) of the link element
Cross-section editor will appear
You can choose the shape of the cross-section
For example, if you select “Circular”, it can be referred to as a culvert
If you select “Trapezoidal”, it can be referred to as a open channel
6
8. 7
Change the type (shape) of the link element
Values needed for the cross-section will automatically change when
you select a single shape
You can select numbers of barrels and enter values relating to the
cross-section
7
9. 8
8
Conduit ID Type Type of shape
C1 Open channels Trapezoidal
C2 Gutters Trapezoidal
C3 Pipelines Circular
C4 Open channels Trapezoidal
C5 Open channels Trapezoidal
C6 Open channels Trapezoidal
C7 Pipelines Circular
C8 Open channels Trapezoidal
C9 Open channels Trapezoidal
C10 Open channels Trapezoidal
C11 Pipelines Circular
Change the type (shape) of the link element
Change the types of each conduit by following the tables below
10. 9
9
Change the type (shape) of the link element
Change the type of each conduit using the following information
Type of shape Cross section D (m) Z1 Z2 b (m) h (m) n
Trapezoidal
(Open Channel)
- 5 5 2 2 0.05
Trapezoidal
(Gutter)
- 0.0001 25 0 1 0.016
Circular
(Pipeline)
1.5 - - - - 0.016
11. 10
Properties for link elements
Values relating to link elements
can be entered manually from the
highlighted box
10
12. 11
11
Checking the results of flooding
When flooding occurs after the SWMM run, there will be a difference
in flooding loss in the status result
13. 12
12
Checking the results of flooding
When flooding occurs after the SWMM run, there will be a difference
in the summary results
14. 13
13
Determination of efficient sizes for pipelines (C3, C7 and C11)
Start with each culvert at the largest available diameter, 1.5 m and
reduce by 0.1 m.
Make a series of SWMM runs, reducing the size of conduit C3 until
flooding occurs
Then you can find the efficient pipeline diameter without flooding.
Repeat this process for conduits C7 and C11
Make sure that you handle the conduits in the upstream first
Decide the efficient diameters for three pipelines (C3, C7 and C11)
15. 14
14
Determine the efficient
diameters of three conduits
(C3, C7, and C11) for two
different rainfall events.
Draw a hydrograph of each
rainfall event for junction
J3 and outfall. Compare
results for two events.
Rainfall 1
0:00 1
0:05 1.14
0:10 1.33
0:15 2.23
0:20 2.84
0:25 5.49
0:30 9.95
0:35 4.12
0:40 2.48
0:45 1.46
0:50 1.22
0:55 1.06
1:00 1
1:05 0.95
1:10 0.91
1:15 0.87
1:20 0.84
1:25 0.81
1:30 0.78
1:35 0.75
1:40 0.73
1:45 0.71
1:50 0.69
1:55 0.67
Rainfall 2
0:00 0.49
0:05 0.56
0:10 0.65
0:15 1.09
0:20 1.39
0:25 2.69
0:30 4.87
0:35 2.02
0:40 1.21
0:45 0.71
0:50 0.6
0:55 0.52
1:00 0.39
1:05 0.37
1:10 0.35
1:15 0.34
1:20 0.32
1:25 0.31
1:30 0.3
1:35 0.29
1:40 0.28
1:45 0.27
1:50 0.26
1:55 0.25
Exercise 2