Automatic inlet spacing

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


How can I perform inlet / gully spacing in StormCAD or the GVF-Rational solver in CivilStorm or SewerGEMS? Can it automatically place my catchbasin nodes based on design requirements?


The current version of StormCAD, SewerGEMS and CivilStorm can automatically design pipe sizes, inverts and inlet sizes. Catchbasins must already be placed in the desired locations however. If you would like to perform inlet/gully spacing, a recommended workflow would be to use Bentley MX Drainage and data interoperability with the OpenFlows product. The spacing of inlets/gullies is automated in MX Drainage; it will automatically work out where to put them based on cross slopes and gradients, and an allowable spread width. If you have access to MX, you can use the following workflow:

1) Lay out the model and perform inlet spacing in Bentley MX Drainage

Here is the video on Automatic Inlet Spacing using MXDrainage.

2) Import the MX model into CivilStorm or StormCAD for further analysis (File > Import > MX)
3) When done, export back to MX for drawing production (File > Export > LandXML)

Note that future versions of the OpenFlows storm and sewer products may be enhanced to provide this spacing functionality in constraint based design.

Element Property Inferencing

The Element Property Inferencing tool can be used to automatically create manholes at even spacing between two existing manholes. The intent of this tool is to populate missing data, but it could potentially be used for inlet spacing in this manner, so long as the series of inlets forms a straight line. After the element property inferencing tool creates the manholes, you can select them and use the Batch Morph tool to convert them to catchbasins if needed.

Catchment Delineation

The catchment delineation tool can be used to help you determine locations of inlets. When placing a catchbasin, the associated contributing area will be delineated and a catchbasin placed. However, you would still need to use your engineering judgement in CivilStorm/SewerGEMS/StormCAD to determine if more inlets would be better than larger inlets (perhaps considering inlet size and spacing constraints).

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