AutoCAD Civil 3D - Stormwater
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C3D to SSA - Catchment to Basin
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In the migration from C3D to SSA the Basin Icon seems to be located outside of the catchment area of a current design we are looking at. Is there a way to automate the location of the Basin Icon so that is properly represented in the Catchment area delineated in C#D.
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Re: C3D to SSA - Catchment to Basin
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Hi,
SSA by default places the subbasin icon at the centroid of the polygon, so unfortunately there is no option to change the location of the icon.
Thanks,

Mangkhothang (Matt) Haokip
Product Support Specialist
Autodesk, Inc.
Re: C3D to SSA - Catchment to Basin
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Thanks for the response. However, the ICONs are not being located within the centroid of the catchment, but are outside of it. Most cases they are located about 2:00 O'clock. The catchments we are creating are based on objects / drawn polylines which discharge to an inlet.
Re: C3D to SSA - Catchment to Basin
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Hi,
I guess, I misinterprated your question. What I meant to say was, when a subbasin/catchment area is delineated in SSA, the subbasin icon is by default located at the centroid of that polygon representing the catchment area.
The isue you are seeing is because the STM file doesn’t store catchment boundary information – and doesn’t know it’s location. It’s only schematically relative to the structure – so it comes in at 2:00 o’clock from the structure. So SSA doesn’t know about the boundary – it only shows it graphically by importing the C3D file.
You may want to drag the Subbasin icons toward the center of each catchment that comes into SSA as a background drawing from Civil 3D. Once you are all set, you can lock the coordinates of the elements within SSA using the Lock icon in the Tool bar.
Thanks,

Mangkhothang (Matt) Haokip
Product Support Specialist
Autodesk, Inc.
Re: C3D to SSA - Catchment to Basin
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Thanks Matt!
