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Design and incorporate an emergency overflow into a drainage system model.
Type:
Tutorial
Length:
5 min.
Tutorial resources
These downloadable resources will be used to complete this tutorial:
Transcript
00:03
once you have designed a pond and incorporated it into a drainage system model,
00:08
you can also add an overflow system.
00:11
The pond itself should fill up to the top water level,
00:14
which was established in your design criteria during a 30 year rainfall event.
00:20
But in emergency overflow decreases the potential for localized flooding
00:24
during heavier rains. By giving excess water a place to drain into.
00:30
With a model. Open
00:31
navigate to the toolbox and expand the junctions node,
00:35
click and drag the simple junction icon and snap it to the node just outside the pond
00:40
provided by the pond pipe background image.
00:44
You may need to load this into the cat data in the tree view.
00:48
This creates a point in the plan view that
00:50
represents a location outside of the drainage system.
00:54
Next expand the connections node and click and drag the no delay connection type and
00:60
snap it to the point inside the ponds boundary to create an outlet point.
01:05
Remember to work upstream to downstream. When you are making connections
01:10
with the start point set,
01:12
click the simple junction point, you just created to complete the connection.
01:17
No delay.
01:18
Connections are useful if you need water to
01:20
flow from one place to another instantly.
01:22
Such as in this situation where the water will be flowing over a weir,
01:27
click the select tool before continuing
01:30
the outlet point, you placed inside the pond is an orifice by default,
01:34
but for this exercise you will design it as a were
01:38
double click the new outlet icon to view its properties
01:43
In the pond. Dialogue outlets tab, you can now see two outlets named outlet
01:48
and outlet. one
01:50
expand the outlet type, drop down for outlet one
01:54
and select were
01:56
In the were properties area, set the crest level to 32.109 m,
02:02
which is the free board level of the pond.
02:05
Then set the width to 3.00 m, so that it is plenty wide. To catch any overflow,
02:12
click OK to complete the overflow and save your progress.
Video transcript
00:03
once you have designed a pond and incorporated it into a drainage system model,
00:08
you can also add an overflow system.
00:11
The pond itself should fill up to the top water level,
00:14
which was established in your design criteria during a 30 year rainfall event.
00:20
But in emergency overflow decreases the potential for localized flooding
00:24
during heavier rains. By giving excess water a place to drain into.
00:30
With a model. Open
00:31
navigate to the toolbox and expand the junctions node,
00:35
click and drag the simple junction icon and snap it to the node just outside the pond
00:40
provided by the pond pipe background image.
00:44
You may need to load this into the cat data in the tree view.
00:48
This creates a point in the plan view that
00:50
represents a location outside of the drainage system.
00:54
Next expand the connections node and click and drag the no delay connection type and
00:60
snap it to the point inside the ponds boundary to create an outlet point.
01:05
Remember to work upstream to downstream. When you are making connections
01:10
with the start point set,
01:12
click the simple junction point, you just created to complete the connection.
01:17
No delay.
01:18
Connections are useful if you need water to
01:20
flow from one place to another instantly.
01:22
Such as in this situation where the water will be flowing over a weir,
01:27
click the select tool before continuing
01:30
the outlet point, you placed inside the pond is an orifice by default,
01:34
but for this exercise you will design it as a were
01:38
double click the new outlet icon to view its properties
01:43
In the pond. Dialogue outlets tab, you can now see two outlets named outlet
01:48
and outlet. one
01:50
expand the outlet type, drop down for outlet one
01:54
and select were
01:56
In the were properties area, set the crest level to 32.109 m,
02:02
which is the free board level of the pond.
02:05
Then set the width to 3.00 m, so that it is plenty wide. To catch any overflow,
02:12
click OK to complete the overflow and save your progress.
After a pond has been designed and incorporated into a drainage system model, an overflow system can be added. Once a pond fills up to the top water level, as established in your design and rainfall event criteria, an emergency overflow decreases the potential for localized flooding during heavier rains by giving excess water a place to drain into.
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