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Design a pond with customized parameters into your drainage system model.
Type:
Tutorial
Length:
3 min.
Transcript
00:03
Over the course of designing a drainage system,
00:05
there will come a point where you must incorporate a discharge control
00:09
point to limit the amount of water discharged into a receiving watercourse.
00:14
The discharge control device could be something like an orifice,
00:17
hydro brake or a pump.
00:21
Once a catchment is overlaid with concrete or tarmac,
00:25
it will create more and faster runoff.
00:28
A traditional solution to this problem is to
00:31
build a storage or attenuation structure i.
00:33
E. A pond upstream of the discharge point,
00:36
store the water there
00:38
and release it slowly into the receiving watercourse.
00:42
For this exercise, you will model upon with a base level of 30.343 m.
00:48
A top water level t. w. l
00:51
of 32.109
00:54
And a one in 4 side slope.
00:57
The amount of slope here is purely for safety concerns.
01:00
If someone falls into a pond,
01:02
a shallower slope gives them a better chance of escaping
01:07
notice that in this diagram the pond is designed with a 200 millimeter free board
01:12
as this will be important later
01:15
with an exercise already open
01:17
in the plan view zoom into the point of the model where the pond will be built
01:23
in this example double click pipe, 1.16.
01:27
To open the connections dialog and view its attributes.
01:32
Note that the upstream cover level of this pipe is 32.309.
01:38
The 200 millimeter free board we noted earlier
01:41
means water should not come within 200 millimeters of the upstream cover level.
01:46
Therefore the top water level in this case would be 32.109.
01:53
The base level of 30.434 m
01:56
comes from the pipes upstream invert level.
01:59
In other words, the pond's base level cannot be lower than the pipe
02:03
otherwise, water could not drain out of it
02:06
at this time you must determine the size of the pond.
02:09
First you load surface data. If you have not done so already
02:14
right click the surface node and select load
02:16
surface to open the surface data dialog,
02:20
click load from and then navigate to a folder
02:23
that holds an info drainage surface data file,
02:26
select the surface data file called import surface trimmed and click open
02:31
and then okay. In the surface data dialog
02:35
a notification appears asking if you want to update all or
02:39
keep all existing surface data or manually maintain specific levels.
02:45
Select the keep all option
02:47
and the surface data appears in the plan view.
02:50
You do not need to see the surface data for this exercise so
02:54
navigate to the tree view and toggle the visibility of the surface off.
02:59
This is also a good time to save the model if you have not already.
03:03
Now it is time to place the pond in the model
03:07
In this example
03:08
it will replace pipe 1.015
03:12
With the select tool click pipe 1.015 and press delete.
03:19
Now you can either use the stormwater controls objects from
03:22
the toolbox or you can import an existing pond design.
03:27
In this case,
03:28
you're going to import the outline of the pond as a cad
03:31
background and then create the pond Using the tools in the toolbox
03:37
in the tree view,
03:38
right click the cat data node and select import data
03:43
in the load cad wizard, click select
03:46
and navigate to the data folder,
03:48
highlight the pond outline file and click open
03:52
and then in the load cad wizard, click next
03:56
note that the imported data includes multiple layers.
03:59
Then click finish,
04:01
zoom back into the area where you deleted the pipe
04:04
and notice that a pond outline now appears there.
04:08
Click the plant tab and select the snap mode to enable it
04:12
in the toolbox,
04:13
expand the stormwater controls node
04:16
to see a list of control systems,
04:19
click and drag the pond option into the plan view
04:21
and drop it into the polygon representing the pond outline.
04:25
Notice that the cursor has now changed, meaning that at this point
04:29
you must trace the pond's outline to digitize it
04:33
zoom in if needed
04:34
and click each of the polygons, vortices,
04:37
then right, click anywhere inside the polygon to finish it.
04:41
It is best practice to then make sure the select tool
04:44
is active to avoid creating a series of ponds by accident.
04:49
Double click the pond icon to view its attributes in the pond dialogue.
04:53
This is where you will adjust the ponds dimensions
04:56
to match those established in the starting diagram
04:59
Set the ponds accidents level to 32.309,
05:04
which is the ponds top water level.
05:07
Also set the free board to 200.
05:11
If the water level in the pond exceeds 32.109 m
05:15
I. E. The free board.
05:17
The pond will be reported as flood risk in the simulation results
05:22
toggle on the depth field.
05:24
Now you can edit the previously grayed out base level field,
05:29
Enter a base level of 30.434.
05:33
You have the option to enter an initial depth value if you want
05:37
the pond to be partly filled at the start of the simulation.
05:41
But for the purposes of this exercise,
05:43
leave it set to zero.
05:46
You will now use the other part of the pond
05:48
dialogue to set some basic characteristics for the pond,
05:51
namely its volume.
05:53
By setting values for depth and area.
05:56
If the pond were perfectly cylindrical,
05:59
its surface area would remain constant no matter its depth.
06:03
However, because its sides are sloped,
06:05
the area will change in relation to its depth.
06:09
Leave the depth value in the first row set to zero
06:12
and enter a depth of 1.875.
06:15
The ponds exceeded its level minus its base level
06:18
into the second row.
06:20
Press enter,
06:22
Then
06:23
copy and paste the area value of 449.43 from the first row
06:28
into the 2nd row
06:29
and press enter again.
06:32
You will notice that in the preview area
06:34
the sides of the pond are vertical with its current depth and area values.
06:39
Now open the sizing calculator in the pond. Dialogue
06:44
in the method, drop down,
06:45
pick a side slope
06:48
Type in a side slope value of four
06:51
in the maintain drop down,
06:52
make sure top area is selected
06:54
and then click OK.
06:58
The preview area updates to reflect the ponds,
07:00
intended side slope with the base area reduced and the top area maintained,
07:06
click OK.
07:08
The pond updates in the plan view to include
07:11
a dashed line that represents its base area.
07:14
The last step is to apply a manning's roughness coefficient.
07:19
This is only used in the pond floods onto the surrounding surface,
07:23
but nevertheless
07:24
a value must be provided for the pond to pass validation,
07:28
double click the pond icon
07:30
and then the advanced tab,
07:33
Enter a value of 0.030.
07:36
And then click OK.
07:38
Your model now includes a pond
07:40
which plays a critical role in regulating the amount and
07:43
speed of runoff before it reaches a receiving watercourse.
Video transcript
00:03
Over the course of designing a drainage system,
00:05
there will come a point where you must incorporate a discharge control
00:09
point to limit the amount of water discharged into a receiving watercourse.
00:14
The discharge control device could be something like an orifice,
00:17
hydro brake or a pump.
00:21
Once a catchment is overlaid with concrete or tarmac,
00:25
it will create more and faster runoff.
00:28
A traditional solution to this problem is to
00:31
build a storage or attenuation structure i.
00:33
E. A pond upstream of the discharge point,
00:36
store the water there
00:38
and release it slowly into the receiving watercourse.
00:42
For this exercise, you will model upon with a base level of 30.343 m.
00:48
A top water level t. w. l
00:51
of 32.109
00:54
And a one in 4 side slope.
00:57
The amount of slope here is purely for safety concerns.
01:00
If someone falls into a pond,
01:02
a shallower slope gives them a better chance of escaping
01:07
notice that in this diagram the pond is designed with a 200 millimeter free board
01:12
as this will be important later
01:15
with an exercise already open
01:17
in the plan view zoom into the point of the model where the pond will be built
01:23
in this example double click pipe, 1.16.
01:27
To open the connections dialog and view its attributes.
01:32
Note that the upstream cover level of this pipe is 32.309.
01:38
The 200 millimeter free board we noted earlier
01:41
means water should not come within 200 millimeters of the upstream cover level.
01:46
Therefore the top water level in this case would be 32.109.
01:53
The base level of 30.434 m
01:56
comes from the pipes upstream invert level.
01:59
In other words, the pond's base level cannot be lower than the pipe
02:03
otherwise, water could not drain out of it
02:06
at this time you must determine the size of the pond.
02:09
First you load surface data. If you have not done so already
02:14
right click the surface node and select load
02:16
surface to open the surface data dialog,
02:20
click load from and then navigate to a folder
02:23
that holds an info drainage surface data file,
02:26
select the surface data file called import surface trimmed and click open
02:31
and then okay. In the surface data dialog
02:35
a notification appears asking if you want to update all or
02:39
keep all existing surface data or manually maintain specific levels.
02:45
Select the keep all option
02:47
and the surface data appears in the plan view.
02:50
You do not need to see the surface data for this exercise so
02:54
navigate to the tree view and toggle the visibility of the surface off.
02:59
This is also a good time to save the model if you have not already.
03:03
Now it is time to place the pond in the model
03:07
In this example
03:08
it will replace pipe 1.015
03:12
With the select tool click pipe 1.015 and press delete.
03:19
Now you can either use the stormwater controls objects from
03:22
the toolbox or you can import an existing pond design.
03:27
In this case,
03:28
you're going to import the outline of the pond as a cad
03:31
background and then create the pond Using the tools in the toolbox
03:37
in the tree view,
03:38
right click the cat data node and select import data
03:43
in the load cad wizard, click select
03:46
and navigate to the data folder,
03:48
highlight the pond outline file and click open
03:52
and then in the load cad wizard, click next
03:56
note that the imported data includes multiple layers.
03:59
Then click finish,
04:01
zoom back into the area where you deleted the pipe
04:04
and notice that a pond outline now appears there.
04:08
Click the plant tab and select the snap mode to enable it
04:12
in the toolbox,
04:13
expand the stormwater controls node
04:16
to see a list of control systems,
04:19
click and drag the pond option into the plan view
04:21
and drop it into the polygon representing the pond outline.
04:25
Notice that the cursor has now changed, meaning that at this point
04:29
you must trace the pond's outline to digitize it
04:33
zoom in if needed
04:34
and click each of the polygons, vortices,
04:37
then right, click anywhere inside the polygon to finish it.
04:41
It is best practice to then make sure the select tool
04:44
is active to avoid creating a series of ponds by accident.
04:49
Double click the pond icon to view its attributes in the pond dialogue.
04:53
This is where you will adjust the ponds dimensions
04:56
to match those established in the starting diagram
04:59
Set the ponds accidents level to 32.309,
05:04
which is the ponds top water level.
05:07
Also set the free board to 200.
05:11
If the water level in the pond exceeds 32.109 m
05:15
I. E. The free board.
05:17
The pond will be reported as flood risk in the simulation results
05:22
toggle on the depth field.
05:24
Now you can edit the previously grayed out base level field,
05:29
Enter a base level of 30.434.
05:33
You have the option to enter an initial depth value if you want
05:37
the pond to be partly filled at the start of the simulation.
05:41
But for the purposes of this exercise,
05:43
leave it set to zero.
05:46
You will now use the other part of the pond
05:48
dialogue to set some basic characteristics for the pond,
05:51
namely its volume.
05:53
By setting values for depth and area.
05:56
If the pond were perfectly cylindrical,
05:59
its surface area would remain constant no matter its depth.
06:03
However, because its sides are sloped,
06:05
the area will change in relation to its depth.
06:09
Leave the depth value in the first row set to zero
06:12
and enter a depth of 1.875.
06:15
The ponds exceeded its level minus its base level
06:18
into the second row.
06:20
Press enter,
06:22
Then
06:23
copy and paste the area value of 449.43 from the first row
06:28
into the 2nd row
06:29
and press enter again.
06:32
You will notice that in the preview area
06:34
the sides of the pond are vertical with its current depth and area values.
06:39
Now open the sizing calculator in the pond. Dialogue
06:44
in the method, drop down,
06:45
pick a side slope
06:48
Type in a side slope value of four
06:51
in the maintain drop down,
06:52
make sure top area is selected
06:54
and then click OK.
06:58
The preview area updates to reflect the ponds,
07:00
intended side slope with the base area reduced and the top area maintained,
07:06
click OK.
07:08
The pond updates in the plan view to include
07:11
a dashed line that represents its base area.
07:14
The last step is to apply a manning's roughness coefficient.
07:19
This is only used in the pond floods onto the surrounding surface,
07:23
but nevertheless
07:24
a value must be provided for the pond to pass validation,
07:28
double click the pond icon
07:30
and then the advanced tab,
07:33
Enter a value of 0.030.
07:36
And then click OK.
07:38
Your model now includes a pond
07:40
which plays a critical role in regulating the amount and
07:43
speed of runoff before it reaches a receiving watercourse.
When a catchment is overlaid with an impermeable surface, such as concrete or tarmac, it will create more (and faster) runoff. A traditional solution to this problem is to build a storage or attenuation structure (i.e., a pond) upstream of the discharge point, store the water there, and release it slowly into the receiving watercourse.
The Load CAD Wizard showing a preview of the pond outline as it will appear in the InfoDrainage model once it is imported, and the Finish button called out.
The pond updates in the Plan View to include a dashed line that represents its base area.
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