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Design and incorporate a SuDS known as a swale into a drainage system model.
Type:
Tutorial
Length:
9 min.
Tutorial resources
These downloadable resources will be used to complete this tutorial:
Transcript
00:03
one type of sustainable drainage solution. Suds is a Swail.
00:08
Swales can be man made or natural and often take
00:11
the form of shallow channels in low lying areas,
00:15
info drainage gives you several options for designing
00:18
swales in adjusting their infiltration rates and volumes
00:22
with the swell design dot I. D. D X.
00:25
Exercise file open in the ribbon plan tab mode panel enabled the snap mode
00:33
in the plan view zoom into the outline of the Swail which was imported from a cad file.
00:39
You can see that water currently flows from Manhole S 9 to S 10 via a pipe.
00:46
You will replace this pipe with a swell
00:48
with the intent of reducing the pond size downstream
00:53
to delete the pipe in the tool box,
00:55
click the select tool and then click the pipe and press delete
00:60
Now you can have the Swail in its place
01:04
in the toolbox, expand the stormwater controls, node,
01:08
click and drag the swell icon to the swell,
01:10
outlining the plan view and drop it somewhere inside its boundaries.
01:15
As soon as you do the cursor changes to show it
01:18
can be used to digitize the outline of the Swail.
01:22
It is important to mention that unlike other types of structures like pawns,
01:26
for example,
01:27
the order in which you digitize the corners of a Swail must be deliberate.
01:32
This is because you must specify dimensions for length and width
01:37
In this example.
01:38
Start by digitizing the corner just to the right and below manhole S. nine,
01:44
then the other upstream corner.
01:47
At this point,
01:48
the digitization cursor locks to the width dimension with an adjustable length,
01:53
drag it downstream to the other end of this
01:55
whale and click again to complete this whale.
01:59
Then click the select tool to end the swell creation.
02:03
Now, double click the Swail icon to view its properties.
02:08
This Swail has an exceed its level of 35.998
02:12
m which is generated by the background surface data
02:16
Toggle on the depth field and it becomes great out.
02:19
Then enter a value of 35 for the swales. Base level
02:24
said its side slope to one,
02:27
Enter a longitudinal slope of 1000
02:30
into Manning's roughness value of 0.020.
02:36
The latter value is important because unlike a pond,
02:39
water flows through a Swail instead of remaining stagnant.
02:43
Another defining characteristic of Suds structures
02:46
is that they allow water to permeate out of them into the surrounding soil.
02:50
So you must set infiltration rates.
02:54
This swell will permeate through both the bottom and sides of the Swail
02:60
to do this,
03:01
click the advanced tab in the Swail dialogue
03:05
Enable both the base and side infiltration rates and then set both to 0.02 m/h.
03:14
In this case the safety factor is set to 2.0,
03:17
meaning that the infiltration rate is actually 0.01 m/h.
03:24
Click OK to close the dialog,
03:27
you must now connect the Swail to the rest of the network.
03:31
First load the suds pipe dot D Xf
03:34
as a background cad layer.
03:37
This defines the location of the connecting pipes
03:41
In the toolbox, expand the connections node and drag a pipe onto Manhole S nine
03:47
connect the downstream end of the pipe to the end of the background pipe.
03:51
Of course, making sure that the snap tool is enabled.
03:55
Now drag another pipe onto the image of the pipe
03:57
leaving the Swail and connect the downstream end to Manhole.
04:01
S 10.
04:03
As you hover the cursor over manhole S 10, you have the choice of either new or inlet,
04:09
click the inlet option.
04:12
Using the select tool,
04:13
double click either of the new pipes and set the diameters of both to 300.
04:20
You will use an orifice to control the discharge from the Swail.
04:24
It must be designed in a way that
04:26
maximizes the swales storage capacity without causing flooding.
04:31
In this case
04:32
the Swell has a volume of 184.189 m3.
04:38
The task therefore, is to define an orifice diameter
04:42
that limits the discharge such that this amount of
04:44
storage is utilized during the one in 30-year design storms
04:50
in the tree view,
04:51
right click flow paths and click add
04:54
click manhole S one to start the flow path
04:57
and then manhole S nine. To complete it
05:01
with the new flow path highlighted in the ribbon results tab reports panel,
05:07
click in flow summary.
05:09
You can now see the flow path, has an area analyzed value of 0.654 hectares.
05:17
Close the inflow summary,
05:20
you must now estimate what the discharge rate out of this whale will be
05:24
in the preliminary sizing tab calculators panel select quick storage estimate.
05:31
Set the input type, drop down to user input,
05:35
Set the area field to 0.654.
05:39
The value from the Inflow Summary
05:42
Set the volumetric runoff coefficient field to a
05:45
value appropriate for winter in this case 0.840
05:51
Estimated discharge rate of 6.0 L/s,
05:56
enter an infiltration rate of 0.2 and enable the srp wizard f S.
06:02
R check box to set the storms that will be simulated,
06:06
click calculate
06:08
The displayed results.
06:09
Tell you that with infiltration and the discharge rate, you just set
06:14
the swales storage should be somewhere between 128 and 217 m3.
06:21
It is important to note that the swales actual volume of 184.189 m3
06:28
falls within this range.
06:31
If it were outside that range, you would need to adjust the discharge rate
06:36
However, you can do better in getting the volume in the middle of this range.
06:41
Try again with a value of four L/s.
06:45
The range with infiltration should now be 136 - 232
06:51
and 184 is very nearly in the middle of this range,
06:56
click OK.
06:58
You will therefore set the orifice size so that the discharge rate is four L/s.
07:04
This value will likely be revised based on results from full simulations
07:10
with the select tool enabled. Double click the Swail icon to view its properties,
07:15
click the outlets tab,
07:18
expand the drop down to change the outlet type to orifice,
07:23
click the calculator icon to open the diameter calculator.
07:28
Set a design depth of one m and a design flow of four liters per second
07:33
which results in a diameter of 0.44 m.
07:38
Keep in mind that an orifice with this diameter would likely be prone to blockages.
07:43
So in reality
07:45
you would need to incorporate a cage or use a different flow control device.
07:50
Click OK to close the calculator
07:52
and click OK again in the swell dialogue
07:56
before running an analysis on the model.
07:58
You have the option to double check that
08:00
you have your analysis criteria set correctly.
08:04
In the analysis tab criteria panel click analysis criteria.
08:11
If the criteria are correct, click okay
08:14
in the analysis panel
08:16
select validate
08:18
in this example there are no errors.
08:22
Click OK to close the results
08:24
and then save your progress
Video transcript
00:03
one type of sustainable drainage solution. Suds is a Swail.
00:08
Swales can be man made or natural and often take
00:11
the form of shallow channels in low lying areas,
00:15
info drainage gives you several options for designing
00:18
swales in adjusting their infiltration rates and volumes
00:22
with the swell design dot I. D. D X.
00:25
Exercise file open in the ribbon plan tab mode panel enabled the snap mode
00:33
in the plan view zoom into the outline of the Swail which was imported from a cad file.
00:39
You can see that water currently flows from Manhole S 9 to S 10 via a pipe.
00:46
You will replace this pipe with a swell
00:48
with the intent of reducing the pond size downstream
00:53
to delete the pipe in the tool box,
00:55
click the select tool and then click the pipe and press delete
00:60
Now you can have the Swail in its place
01:04
in the toolbox, expand the stormwater controls, node,
01:08
click and drag the swell icon to the swell,
01:10
outlining the plan view and drop it somewhere inside its boundaries.
01:15
As soon as you do the cursor changes to show it
01:18
can be used to digitize the outline of the Swail.
01:22
It is important to mention that unlike other types of structures like pawns,
01:26
for example,
01:27
the order in which you digitize the corners of a Swail must be deliberate.
01:32
This is because you must specify dimensions for length and width
01:37
In this example.
01:38
Start by digitizing the corner just to the right and below manhole S. nine,
01:44
then the other upstream corner.
01:47
At this point,
01:48
the digitization cursor locks to the width dimension with an adjustable length,
01:53
drag it downstream to the other end of this
01:55
whale and click again to complete this whale.
01:59
Then click the select tool to end the swell creation.
02:03
Now, double click the Swail icon to view its properties.
02:08
This Swail has an exceed its level of 35.998
02:12
m which is generated by the background surface data
02:16
Toggle on the depth field and it becomes great out.
02:19
Then enter a value of 35 for the swales. Base level
02:24
said its side slope to one,
02:27
Enter a longitudinal slope of 1000
02:30
into Manning's roughness value of 0.020.
02:36
The latter value is important because unlike a pond,
02:39
water flows through a Swail instead of remaining stagnant.
02:43
Another defining characteristic of Suds structures
02:46
is that they allow water to permeate out of them into the surrounding soil.
02:50
So you must set infiltration rates.
02:54
This swell will permeate through both the bottom and sides of the Swail
02:60
to do this,
03:01
click the advanced tab in the Swail dialogue
03:05
Enable both the base and side infiltration rates and then set both to 0.02 m/h.
03:14
In this case the safety factor is set to 2.0,
03:17
meaning that the infiltration rate is actually 0.01 m/h.
03:24
Click OK to close the dialog,
03:27
you must now connect the Swail to the rest of the network.
03:31
First load the suds pipe dot D Xf
03:34
as a background cad layer.
03:37
This defines the location of the connecting pipes
03:41
In the toolbox, expand the connections node and drag a pipe onto Manhole S nine
03:47
connect the downstream end of the pipe to the end of the background pipe.
03:51
Of course, making sure that the snap tool is enabled.
03:55
Now drag another pipe onto the image of the pipe
03:57
leaving the Swail and connect the downstream end to Manhole.
04:01
S 10.
04:03
As you hover the cursor over manhole S 10, you have the choice of either new or inlet,
04:09
click the inlet option.
04:12
Using the select tool,
04:13
double click either of the new pipes and set the diameters of both to 300.
04:20
You will use an orifice to control the discharge from the Swail.
04:24
It must be designed in a way that
04:26
maximizes the swales storage capacity without causing flooding.
04:31
In this case
04:32
the Swell has a volume of 184.189 m3.
04:38
The task therefore, is to define an orifice diameter
04:42
that limits the discharge such that this amount of
04:44
storage is utilized during the one in 30-year design storms
04:50
in the tree view,
04:51
right click flow paths and click add
04:54
click manhole S one to start the flow path
04:57
and then manhole S nine. To complete it
05:01
with the new flow path highlighted in the ribbon results tab reports panel,
05:07
click in flow summary.
05:09
You can now see the flow path, has an area analyzed value of 0.654 hectares.
05:17
Close the inflow summary,
05:20
you must now estimate what the discharge rate out of this whale will be
05:24
in the preliminary sizing tab calculators panel select quick storage estimate.
05:31
Set the input type, drop down to user input,
05:35
Set the area field to 0.654.
05:39
The value from the Inflow Summary
05:42
Set the volumetric runoff coefficient field to a
05:45
value appropriate for winter in this case 0.840
05:51
Estimated discharge rate of 6.0 L/s,
05:56
enter an infiltration rate of 0.2 and enable the srp wizard f S.
06:02
R check box to set the storms that will be simulated,
06:06
click calculate
06:08
The displayed results.
06:09
Tell you that with infiltration and the discharge rate, you just set
06:14
the swales storage should be somewhere between 128 and 217 m3.
06:21
It is important to note that the swales actual volume of 184.189 m3
06:28
falls within this range.
06:31
If it were outside that range, you would need to adjust the discharge rate
06:36
However, you can do better in getting the volume in the middle of this range.
06:41
Try again with a value of four L/s.
06:45
The range with infiltration should now be 136 - 232
06:51
and 184 is very nearly in the middle of this range,
06:56
click OK.
06:58
You will therefore set the orifice size so that the discharge rate is four L/s.
07:04
This value will likely be revised based on results from full simulations
07:10
with the select tool enabled. Double click the Swail icon to view its properties,
07:15
click the outlets tab,
07:18
expand the drop down to change the outlet type to orifice,
07:23
click the calculator icon to open the diameter calculator.
07:28
Set a design depth of one m and a design flow of four liters per second
07:33
which results in a diameter of 0.44 m.
07:38
Keep in mind that an orifice with this diameter would likely be prone to blockages.
07:43
So in reality
07:45
you would need to incorporate a cage or use a different flow control device.
07:50
Click OK to close the calculator
07:52
and click OK again in the swell dialogue
07:56
before running an analysis on the model.
07:58
You have the option to double check that
08:00
you have your analysis criteria set correctly.
08:04
In the analysis tab criteria panel click analysis criteria.
08:11
If the criteria are correct, click okay
08:14
in the analysis panel
08:16
select validate
08:18
in this example there are no errors.
08:22
Click OK to close the results
08:24
and then save your progress
One type of sustainable drainage solution (SuDS) is a swale. Swales can be manmade or natural, and often take the form of shallow channels in low-lying areas. InfoDrainage gives you several options for designing swales and adjusting their infiltration rates and volumes.
Notice that the cursor changes to show it can be used to digitize the outline of the swale.
IMPORTANT: Unlike other types of structures—like ponds, for example—the order in which you digitize the corners of a swale must be deliberate because you must specify dimensions for length and width.
Another defining characteristic of SuDS structures is that they allow water to permeate out of them into the surrounding soil, so you must set infiltration rates. This swale will permeate through both the bottom and sides of the swale.
You will use an orifice to control the discharge from the swale. It must be designed in a way that maximizes the swale’s storage capacity without causing flooding. In this case, the swale has a volume of 184.189 cubic meters. The task, therefore, is to define an orifice diameter that limits the discharge such that this amount of storage is utilized during the 1-in-30-year design storms.
The displayed results tell you that with infiltration and the discharge rate you just set, the swale’s storage should be somewhere between 128 and 217 cubic meters.
The Results should now report a range with infiltration of 136 to 232 meters cubed.
In this example, there are no errors.
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