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Professional CAD/CAM tools built on Inventor and AutoCAD
Integrated BIM tools, including Revit, AutoCAD, and Civil 3D
Professional CAD/CAM tools built on Inventor and AutoCAD
Design pipes to meet no-flood criteria by setting the network design criteria.
Type:
Tutorial
Length:
3 min.
Transcript
00:03
for drainage designs to be valid. They first have to meet the no surcharge criteria
00:08
and then they must meet the no flood criteria.
00:12
In this example, the no surcharge criteria have already been designed
00:16
and the pipes have been sized adequately for no surcharge.
00:21
First
00:22
edit the rainfall data so that you are using a longer period storm
00:26
on the ribbon rainfall slash pollutants tab rainfall panel,
00:31
click rainfall manager to open the rainfall manager.
00:35
The design dot rainfall dot I D R X file is already active
00:41
in the tree view,
00:42
expand the design storms node and expand the F S R node and select rain one to edit it
00:49
The Rain one Parameters appear,
00:52
click the return periods tab.
00:55
Currently
00:56
there is a two year period set up,
00:59
click add to add another return period
01:02
Under return period years,
01:04
enter 30,
01:06
Then
01:07
enable the use option for the new 30-year storm and
01:10
then disable the two year storm to deactivate it.
01:14
Click the storm durations tab
01:16
here, leave all nine of these storms active,
01:20
return to the return periods tab to ensure the 30 year storm is active.
01:24
And then click the parameters tab here, leave both summer and winter active,
01:29
which multiplied by the nine active storms gives you an
01:37
click save and then exit the rainfall manager.
01:41
Keep in mind that the no flood criteria
01:43
are quite different from the no surcharge criteria.
01:47
The no flood considers a much longer period of time
01:50
as well as the extreme changes to the rainfall amounts,
01:53
whereas the no surcharge criteria took into account
01:56
a steady state or steady flow of runoff.
02:00
Now that the rainfall criteria have been set,
02:03
you can configure the analysis criteria
02:06
on the ribbon,
02:07
click the analysis tab and then in the criteria panel click analysis criteria.
02:13
The analysis criteria, dialog opens
02:17
here, you stipulate which storms you will run the analysis with.
02:21
In this case there is only one storm,
02:23
so click the checkbox next to rain one to select it
02:28
As soon as you do,
02:29
you can see the method number of storms and the maximum runtime values
02:35
appear as FS are the 18 storms 2880 minutes of runtime respectively.
02:43
Notice the output interval value set to one minute.
02:48
This indicates that the program is reporting a calculated result every minute.
02:54
It is actually performing the calculations every few seconds.
02:57
But for the purposes of the graphing and table tools, it is reported once per minute,
03:03
expand the time step drop down.
03:05
This affects how often the program performs the calculations,
03:09
you can set it to default
03:11
reduced or shortest.
03:15
Essentially this option helps you set the
03:17
balance for creating a stable hydrology model
03:20
in which you can trust the calculations are correct
03:24
info drainage uses S W M M
03:26
a very well understood
03:28
stable calculation model.
03:31
If you were to set this to shortest,
03:33
it would take longer for the calculations to complete.
03:37
In addition,
03:38
it is best to use when you have a more complicated system
03:41
that has storage areas or any constrictions to the flow.
03:44
But since this model is just one line of pipes running downhill,
03:48
you can keep the time step set to default.
03:53
The next parameter urban creep is used to take into
03:56
account that over time the pimp value will increase.
04:00
Property owners may install additional structures or
04:03
they may add a paved parking area,
04:05
all of which would increase the percentage impervious value.
04:10
This can be set to use a global value or
04:13
it can be added to each subcategory within the model
04:17
For this exercise.
04:18
Leave it set to apply global value and leave the percentage set to zero
04:24
the junction flood risk margin is whether the water has come within a certain
04:27
distance of the cover levels in times that it has flooded or nearly flooded.
04:32
This is set to 300
04:35
by default, but you can change this if you need to
04:39
leave the perform no discharge analysis option d selected
04:42
as it is not a normal part of the no flood criteria
04:46
and will not be needed for this exercise.
04:49
Click ok
04:51
with the design criteria set.
04:53
It is time to validate the calculation model
04:57
on the ribbon analysis tab analysis panel, click validate
05:03
the validate. Dialogue opens showing that the site is okay
05:08
if there were any errors such as a pipe that did not have a
05:11
length specified or a manhole that did not have a cover level specified.
05:15
They would appear here under the site node.
05:19
You would be able to click on them to see where in the model the error was
05:23
and the relevant dialog box would open
05:25
so that you could fix the error.
05:28
This is a simple model, however, so no errors occurred.
05:32
Keep in mind that this validation tool checks to
05:35
make sure all the necessary data is there,
05:38
It does not check to make sure the data makes sense.
05:41
For example, if you had an oversized or undersized pipe,
05:45
it would not recognize that here,
05:47
but if those values were completely missing, it would list the error,
05:51
click cancel.
Video transcript
00:03
for drainage designs to be valid. They first have to meet the no surcharge criteria
00:08
and then they must meet the no flood criteria.
00:12
In this example, the no surcharge criteria have already been designed
00:16
and the pipes have been sized adequately for no surcharge.
00:21
First
00:22
edit the rainfall data so that you are using a longer period storm
00:26
on the ribbon rainfall slash pollutants tab rainfall panel,
00:31
click rainfall manager to open the rainfall manager.
00:35
The design dot rainfall dot I D R X file is already active
00:41
in the tree view,
00:42
expand the design storms node and expand the F S R node and select rain one to edit it
00:49
The Rain one Parameters appear,
00:52
click the return periods tab.
00:55
Currently
00:56
there is a two year period set up,
00:59
click add to add another return period
01:02
Under return period years,
01:04
enter 30,
01:06
Then
01:07
enable the use option for the new 30-year storm and
01:10
then disable the two year storm to deactivate it.
01:14
Click the storm durations tab
01:16
here, leave all nine of these storms active,
01:20
return to the return periods tab to ensure the 30 year storm is active.
01:24
And then click the parameters tab here, leave both summer and winter active,
01:29
which multiplied by the nine active storms gives you an
01:37
click save and then exit the rainfall manager.
01:41
Keep in mind that the no flood criteria
01:43
are quite different from the no surcharge criteria.
01:47
The no flood considers a much longer period of time
01:50
as well as the extreme changes to the rainfall amounts,
01:53
whereas the no surcharge criteria took into account
01:56
a steady state or steady flow of runoff.
02:00
Now that the rainfall criteria have been set,
02:03
you can configure the analysis criteria
02:06
on the ribbon,
02:07
click the analysis tab and then in the criteria panel click analysis criteria.
02:13
The analysis criteria, dialog opens
02:17
here, you stipulate which storms you will run the analysis with.
02:21
In this case there is only one storm,
02:23
so click the checkbox next to rain one to select it
02:28
As soon as you do,
02:29
you can see the method number of storms and the maximum runtime values
02:35
appear as FS are the 18 storms 2880 minutes of runtime respectively.
02:43
Notice the output interval value set to one minute.
02:48
This indicates that the program is reporting a calculated result every minute.
02:54
It is actually performing the calculations every few seconds.
02:57
But for the purposes of the graphing and table tools, it is reported once per minute,
03:03
expand the time step drop down.
03:05
This affects how often the program performs the calculations,
03:09
you can set it to default
03:11
reduced or shortest.
03:15
Essentially this option helps you set the
03:17
balance for creating a stable hydrology model
03:20
in which you can trust the calculations are correct
03:24
info drainage uses S W M M
03:26
a very well understood
03:28
stable calculation model.
03:31
If you were to set this to shortest,
03:33
it would take longer for the calculations to complete.
03:37
In addition,
03:38
it is best to use when you have a more complicated system
03:41
that has storage areas or any constrictions to the flow.
03:44
But since this model is just one line of pipes running downhill,
03:48
you can keep the time step set to default.
03:53
The next parameter urban creep is used to take into
03:56
account that over time the pimp value will increase.
04:00
Property owners may install additional structures or
04:03
they may add a paved parking area,
04:05
all of which would increase the percentage impervious value.
04:10
This can be set to use a global value or
04:13
it can be added to each subcategory within the model
04:17
For this exercise.
04:18
Leave it set to apply global value and leave the percentage set to zero
04:24
the junction flood risk margin is whether the water has come within a certain
04:27
distance of the cover levels in times that it has flooded or nearly flooded.
04:32
This is set to 300
04:35
by default, but you can change this if you need to
04:39
leave the perform no discharge analysis option d selected
04:42
as it is not a normal part of the no flood criteria
04:46
and will not be needed for this exercise.
04:49
Click ok
04:51
with the design criteria set.
04:53
It is time to validate the calculation model
04:57
on the ribbon analysis tab analysis panel, click validate
05:03
the validate. Dialogue opens showing that the site is okay
05:08
if there were any errors such as a pipe that did not have a
05:11
length specified or a manhole that did not have a cover level specified.
05:15
They would appear here under the site node.
05:19
You would be able to click on them to see where in the model the error was
05:23
and the relevant dialog box would open
05:25
so that you could fix the error.
05:28
This is a simple model, however, so no errors occurred.
05:32
Keep in mind that this validation tool checks to
05:35
make sure all the necessary data is there,
05:38
It does not check to make sure the data makes sense.
05:41
For example, if you had an oversized or undersized pipe,
05:45
it would not recognize that here,
05:47
but if those values were completely missing, it would list the error,
05:51
click cancel.
For drainage designs to be valid in the UK, they first have to meet the no-surcharge criteria, and then they must meet the no-flood criteria. In this example, the no-surcharge criteria have already been met, so now, it is necessary to check the no flood criteria.
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