How are interconnected ponds modeled in CivilStorm or SewerGEMS?

  Applies To 
  Product(s): CivilStorm, SewerGEMS
  Version(s): CONNECT Edition, V8i
  Area:  Modeling
  Original Author: Scott Kampa, Bentley Technical Support Group

Problem

How are interconnected ponds modeled in CivilStorm or SewerGEMS?

Solution

The following steps are the most common method to model flow going from one pond to the next. 

First, layout your outlet structure element on the upstream pond, using this pond as the Upstream Pond in the properties. For "Has Control Structure?" set this to Yes. You will then need to create your composite outlet structure, if you have not done so already. You can create the composite outlet structure directly from the properties dialog or through the Components pulldown menu.

Next, place an outfall element near the downstream pond. For this outfall, set the property Boundary Condition to "Boundary Element". This will open a new property called Boundary Element. Set the Boundary Element to the downstream pond.

Next, connect the outlet structure element to the outfall with a conduit. This is a necessary step to connect the node elements. If the composite outlet structure for the first pond contains a culvert, you can model the conduit between the ponds as the culvert. Otherwise, you can simply model a conduit large enough that the hydraulic impact is minimal.

Last, define the outlet structure for the downstream pond. The final result will look similar to the screenshot below.

Note that you can have multiple conduits and/or channels between the ponds. As long as the pond outlet structure's "tailwater type" is set to "Interconnected ponds", it will automatically detect the tailwater elevation from the element immediately downstream of the pond.

See more in the section "ICPM in SewerGEMS and CivilStorm" in this article: How does the Interconnected Pond Modeling (ICPM) algorithm work

See Also

Pond and pond outlet assumptions in StormCAD, SewerGEMS, CivilStorm and SewerCAD

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