Directing subsurface or channel flow back to surface or gutter flow

Product(s): StormCAD, CivilStorm, SewerCAD, SewerGEMS
Version(s): CONNECT Edition, V8i
Area: Modeling


Is there a way to direct subsurface flow from a conduit, or channel flow, back to the surface in the Storm and Sewer products? For example, the subsurface flow will go to a gutter to be directed into another inlet.


Subsurface flow is typically not directed to surface flow, like a channel. In addition, if the channel flow approaches an inlet and some of the flow may bypass into the downstream gutter (while some may be captured)  the surface flow would need be in the form of a gutter, and subsurface flow cannot be directed straight to a gutter.

Try splitting the system up into two parts, similar to the following screenshot.

First, model the subsurface system ending in an outfall. The results at the outfall can be used as inflow into the catch basin in the second subnetwork. The second subnetwork will include the gutter used for the surface flow. For example with StormCAD or the GVF-Rational solver, this can be done by setting the flow in the catchbasin's "Flow (Additional Carryover)" field, which will be added at the catch basin as surface flow that can be bypassed into the gutter. With the Implicit or Explicit solvers (in SewerGEMS and CivilStorm), you can copy/paste the outfall hydrograph into a Hydrograph Load in the catchbasin's "Inflow Collection".

See Also

Modeling a Drainage Ditch