This is a easy-to-learn material to guide how to formulate SWMM input file. After following, you will know how to simulate the hydrology of the study watershed. Also check the floodings of all nodes.
4. 3
Date(M/D/Y) Time(H:M)
Start Analysis on 01/01/2007 00:00
Start Reporting on 01/01/2007 00:00
End Analysis on 01/01/2007 12:00
Start Sweeping on 01/01
End Sweeping on 12/31
5. 4
kt
cc effff
)( 0
f Infiltration rate at time (mm/h)
cf
0f
Constant infiltration rate after the soil has been saturated (mm/h)
Initial infiltration rate (mm/h)
k Decay constant specific to the soil (1/h)
11. 10
Parameter Description
N-Imperv Manning’s n for overland flow over the impervious portion of
the subcatchment
N-Perv Manning’s n for overland flow over the pervious portion of the
subcatchment
Dstore-
Imperv
Depth of depression storage on the impervious portion of the
subcatchment
Dstore-
perv
Depth of depression storage on the pervious portion of the
subcatchment
% Zero-
Imperv
Percent of the impervious area with no depression storage
19. 18
Click the junction icon and click on the map to create
Create 11 junctions as the following figure
20. 19
Click the outfall icon and click on the map to create
Create an outfall as the following figure
21. 20
1. 클릭
Click the subcatchment icon and click on the map to create
Left click to create the form, right click to complete creation
Create 7 subcatchemnts
22. 21
Click the conduit icon
Click inlet junction for the starting point and outlet junction for
the ending point
Create 11 conduits
1. click inlet junction
2. click outlet junction
23. 22
1. 클릭
Change names of subcatchments, junctions,
and conduits
Open properties of subcatchment
Enter the name of outlet
Subcatchment S1 is
connected to junction J1
27. 26
② Outfall① Rain Gage
Insert values below
Select time-series for rain gage
Outfall Invert EL. : 509 m
28. 27
③ Subcatchment
1. Insert given values for each subcatchment
2. Insert values for infiltration
3. Connect junction(outlet)s and raingage for all
subcatchments
클릭
2.
3.
32. 31
click Check the flow between junctions
select a node element from the map
then click +
Check profile plot
33. 32
click
1. Select start/end date
2. Select object and variable for x axile
3. Select object and variable for y axile
Check result
1.
2. 3.
34. 33
click
Check results
1.
2.
3. 4.
1. Select start/end date
2. Select time format and objects
3. Select variables
4. Select an element from map then click +
35. 34
click
1. Select start/end date
2. Select time format and objects
3. Select variables
4. Select an element from map then click +
Check results
1.
2.
3.
4.
36. 35
T= 12 mins T= 54 mins
T= 2hr 14mins T= 6hrs 3mins
44. 43
43
Checking results of flooding
• When flooding occurs after the SWMM run, there will be a
difference in flooding loss in the status result
45. 44
1. What is the maximum flow depth for all nodes. Use the
changed outlet offsets for C2, C5 and C9 and the previous
diameters, 1.0 m for C8 and C9.
2. What is the minimum diameter for C8 and C9 without
flooding at J8 and J9? A flooding at C10 still exists.
3. What is the maximum elevation of J11 without flooding at
J10? Use the found diameters of C8 and C9 from Problem 2.
4. Draw a graph including hydrograph and flow depth time
series at the outfall.
5. Find the exact peak time and peak runoff at the outfall.