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Optimize SuDS features in a drainage system model for analysis.
Type:
Tutorial
Length:
7 min.
Tutorial resources
These downloadable resources will be used to complete this tutorial:
Transcript
00:03
Once you have modeled a fully featured drainage system with suds,
00:07
you are ready to simulate how they operate during rainfall events.
00:12
On the ribbon
00:13
analysis tab analysis panel click validate
00:17
in this example. No errors are listed
00:21
click OK
00:23
in the criteria panel select analysis criteria
00:27
in the analysis criteria dialog.
00:30
Make sure the parameters are set as they appear in this example.
00:33
And then click OK
00:36
in the analysis panel, select go to run the analysis.
00:40
Once the simulation is complete,
00:42
the storm water controls summary dialog opens.
00:46
In this example,
00:47
the dialogue shows the results of the 1st 15 minute summer storm
00:52
realise that there are a total of 18 storms
00:55
that were used throughout the creation of this model.
00:58
Click critical storm
00:60
to see how each stormwater control feature handles the most severe rainfall event.
01:06
You should see that three different storms were the
01:08
critical duration for the three storm water controls.
01:12
The percentage available column shows the percentage
01:15
of the total volume of the stormwater
01:17
control available above the maximum water elevation
01:21
measured to the exceed its elevation.
01:24
A negative value shows that the capacity
01:26
of the storage structure has been exceeded.
01:29
In this example, you can see that the pond has 39% of its capacity available.
01:35
This is not surprising because the introduction of the two
01:38
sub structures has reduced the flow rate into the pond
01:42
and you will now be able to reduce its size substantially.
01:46
The swell is at -5%, meaning that it is a little undersized.
01:50
However, the size of this whale is fixed.
01:53
So you need to think about this in a different way.
01:56
You need to increase the discharge rate from
01:58
the Swail so that its capacity is acceptable.
02:02
You can apply a similar approach to the cellular storage.
02:05
It is currently at plus 8%
02:07
so it's passed forward rate can be reduced a little
02:11
once you have optimized the upstream suds you will reassess the pond
02:16
before you optimize your suds features.
02:19
Best practice is to create a new phase
02:22
in the tree view.
02:23
Under the phase management node,
02:25
right click the suds design phase and select duplicate phase.
02:30
Right click the new phase you created and click rename phase.
02:35
In this example the name optimized
02:37
design is entered.
02:40
Press enter when you have finished naming the new phase
02:42
and make sure to deactivate all other phases by
02:45
tunneling off the lightbulb icons next to them,
02:48
leaving the new phase as the only one visible.
02:52
Also make sure they are all set to stop so that only the optimized
02:56
design is set to go and will be analyzed.
03:00
You will first optimize the cellular storage structure.
03:04
Double click its icon to view its properties
03:08
in the outlets.
03:08
Tab open the diameter calculator and decreased the
03:12
design flow from nine liters per second to seven
03:16
Giving a diameter of 58 mm
03:19
click OK.
03:21
In reality it could take you a few iterations or guesses to get to
03:25
the correct pass forward rate but in this case it has been done for you
03:31
apply the same principle to the swales,
03:33
increase the orifice flow to 5.7 liters per second
03:38
Giving a diameter
03:40
of 52 mm.
03:43
In the ribbon
03:44
analysis tab analysis panel,
03:47
click go to run a simulation.
03:50
When the storm water controls summary opens,
03:53
click critical storm and view the percentage available column
03:58
In this example,
03:59
the Swail and cellular storage capacities are
04:01
now optimized to within 2% of capacity
04:04
but the pond is on 39%
04:06
and therefore needs further optimization.
04:10
The stormwater control summary shows that the maximum resident
04:13
volume in the pond is 485 m cubed.
04:17
A top tip is to size the pond slightly smaller than this value.
04:23
In this case it was determined that 385 m cubed
04:26
is the right size for the pond
04:29
with the select tool. Active
04:31
double click the pond icon to open its properties.
04:35
The Dialogue lists a total volume of 795.059 m3
04:42
Open the Sivass calculator and enter a new volume of 385 m3.
04:48
Click OK.
04:50
The pond size changes in the preview window of the pond. Dialogue
04:55
click OK.
04:56
And you see the pond shrink in the plan view.
04:59
Keep in mind that when resizing a pond it may shrink to
05:02
the point that the connection icons fall outside of its boundary,
05:06
in which case they would have to be repositioned
05:11
to make sure all connections were maintained during the optimization process.
05:15
Use a flow path
05:17
in the tree view,
05:19
right click flow paths and select add
05:22
Click Manhole S. 1 to set a start point
05:25
and then click Manhole S. 17 to set an end point.
05:30
In this example,
05:31
the flow path reveals no broken connections.
05:35
You could also right click the new flow path
05:37
and select show profile to see the complete long section
05:42
with the flow path still highlighted
05:44
in the analysis. Tab analysis panel click validate.
05:49
No errors are listed so click Okay.
05:53
Run the simulation again.
05:55
When the storm water control summary opens, click critical storm
05:59
and find the percentage available column.
06:02
There is 0% available but the status is okay.
06:07
The maximum resident volume is 384 m cubed, so less than one m cubed is available.
06:14
In reality you may need to increase the size of the pond slightly,
06:18
but for this exercise
06:19
it is perfectly optimized
Video transcript
00:03
Once you have modeled a fully featured drainage system with suds,
00:07
you are ready to simulate how they operate during rainfall events.
00:12
On the ribbon
00:13
analysis tab analysis panel click validate
00:17
in this example. No errors are listed
00:21
click OK
00:23
in the criteria panel select analysis criteria
00:27
in the analysis criteria dialog.
00:30
Make sure the parameters are set as they appear in this example.
00:33
And then click OK
00:36
in the analysis panel, select go to run the analysis.
00:40
Once the simulation is complete,
00:42
the storm water controls summary dialog opens.
00:46
In this example,
00:47
the dialogue shows the results of the 1st 15 minute summer storm
00:52
realise that there are a total of 18 storms
00:55
that were used throughout the creation of this model.
00:58
Click critical storm
00:60
to see how each stormwater control feature handles the most severe rainfall event.
01:06
You should see that three different storms were the
01:08
critical duration for the three storm water controls.
01:12
The percentage available column shows the percentage
01:15
of the total volume of the stormwater
01:17
control available above the maximum water elevation
01:21
measured to the exceed its elevation.
01:24
A negative value shows that the capacity
01:26
of the storage structure has been exceeded.
01:29
In this example, you can see that the pond has 39% of its capacity available.
01:35
This is not surprising because the introduction of the two
01:38
sub structures has reduced the flow rate into the pond
01:42
and you will now be able to reduce its size substantially.
01:46
The swell is at -5%, meaning that it is a little undersized.
01:50
However, the size of this whale is fixed.
01:53
So you need to think about this in a different way.
01:56
You need to increase the discharge rate from
01:58
the Swail so that its capacity is acceptable.
02:02
You can apply a similar approach to the cellular storage.
02:05
It is currently at plus 8%
02:07
so it's passed forward rate can be reduced a little
02:11
once you have optimized the upstream suds you will reassess the pond
02:16
before you optimize your suds features.
02:19
Best practice is to create a new phase
02:22
in the tree view.
02:23
Under the phase management node,
02:25
right click the suds design phase and select duplicate phase.
02:30
Right click the new phase you created and click rename phase.
02:35
In this example the name optimized
02:37
design is entered.
02:40
Press enter when you have finished naming the new phase
02:42
and make sure to deactivate all other phases by
02:45
tunneling off the lightbulb icons next to them,
02:48
leaving the new phase as the only one visible.
02:52
Also make sure they are all set to stop so that only the optimized
02:56
design is set to go and will be analyzed.
03:00
You will first optimize the cellular storage structure.
03:04
Double click its icon to view its properties
03:08
in the outlets.
03:08
Tab open the diameter calculator and decreased the
03:12
design flow from nine liters per second to seven
03:16
Giving a diameter of 58 mm
03:19
click OK.
03:21
In reality it could take you a few iterations or guesses to get to
03:25
the correct pass forward rate but in this case it has been done for you
03:31
apply the same principle to the swales,
03:33
increase the orifice flow to 5.7 liters per second
03:38
Giving a diameter
03:40
of 52 mm.
03:43
In the ribbon
03:44
analysis tab analysis panel,
03:47
click go to run a simulation.
03:50
When the storm water controls summary opens,
03:53
click critical storm and view the percentage available column
03:58
In this example,
03:59
the Swail and cellular storage capacities are
04:01
now optimized to within 2% of capacity
04:04
but the pond is on 39%
04:06
and therefore needs further optimization.
04:10
The stormwater control summary shows that the maximum resident
04:13
volume in the pond is 485 m cubed.
04:17
A top tip is to size the pond slightly smaller than this value.
04:23
In this case it was determined that 385 m cubed
04:26
is the right size for the pond
04:29
with the select tool. Active
04:31
double click the pond icon to open its properties.
04:35
The Dialogue lists a total volume of 795.059 m3
04:42
Open the Sivass calculator and enter a new volume of 385 m3.
04:48
Click OK.
04:50
The pond size changes in the preview window of the pond. Dialogue
04:55
click OK.
04:56
And you see the pond shrink in the plan view.
04:59
Keep in mind that when resizing a pond it may shrink to
05:02
the point that the connection icons fall outside of its boundary,
05:06
in which case they would have to be repositioned
05:11
to make sure all connections were maintained during the optimization process.
05:15
Use a flow path
05:17
in the tree view,
05:19
right click flow paths and select add
05:22
Click Manhole S. 1 to set a start point
05:25
and then click Manhole S. 17 to set an end point.
05:30
In this example,
05:31
the flow path reveals no broken connections.
05:35
You could also right click the new flow path
05:37
and select show profile to see the complete long section
05:42
with the flow path still highlighted
05:44
in the analysis. Tab analysis panel click validate.
05:49
No errors are listed so click Okay.
05:53
Run the simulation again.
05:55
When the storm water control summary opens, click critical storm
05:59
and find the percentage available column.
06:02
There is 0% available but the status is okay.
06:07
The maximum resident volume is 384 m cubed, so less than one m cubed is available.
06:14
In reality you may need to increase the size of the pond slightly,
06:18
but for this exercise
06:19
it is perfectly optimized
Once you have modeled a fully featured drainage system with SuDS, you are ready to simulate how they operate during rainfall events.
Once the simulation is complete, the Stormwater Controls Summary dialog box opens. In this example, it shows the results of the first 15-minute summer storm. Realize that there are a total of 18 storms that were used throughout the creation of this model.
In this example, three different storms were the critical duration for the three stormwater controls.
The Percentage Available (%) column shows the percentage of the total volume of the Stormwater Control available above the maximum water elevation measured to the exceedance elevation. A negative value shows that the capacity of the storage structure has been exceeded. Here, the pond has 39% of its capacity available. This is not surprising, because the introduction of the two SuDS structures to this model has reduced the flow rate into the pond. Now, you will be able to reduce its size substantially.
The swale is at minus 5%, meaning that it is a little undersized. However, the size of the swale is fixed, so instead, you need to increase the discharge rate from the swale so that its capacity is acceptable.
You can apply a similar approach to the cellular storage. It is currently at plus 8%, so its pass forward rate can be reduced a little.
Once you have optimized the upstream SuDS, you can reassess the pond.
Best practice is to create a new phase for the SuDS optimization:
Note that, back in the Cellular Storage dialog box, a new Diameter of 58 mm was calculated.
In this example, the swale and cellular storage capacities are now optimized to within 2% of capacity, but the pond is on 39% and therefore needs further optimization.
The Stormwater Controls Summary shows that the maximum resident volume in the pond is 485 meters cubed. A top tip is to size the pond slightly smaller than this value. In this case, it was determined that 385 meters cubed is the right size for the pond.
In this example, the flow path reveals no broken connections.
There is zero percent available, but the Status is OK. The maximum resident volume is 384 meters cubed, so less than 1 meter cubed is available. In reality, you may need to increase the size of the pond slightly, but for this exercise, it is perfectly optimized.
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