Automatic "C" calculation in StormCAD?

[proletariat]

I just started using Bentley Stormcad after coming from Hydraflow for storm sewer analysis. Is there any way to define areas of cover (impervious, lawn, etc.) and have Stormcad overlay those with each catchment area to automatically generate a weighted C? I find that deriving the runoff coefficient is the slowest part of the whole process.

I used to do this in AutoCAD Map using topologies, and export to Excel, but don't have that software available anymore. It would be great if Stormcad did it internally.

 

[beej67]

My experience is with the pre-GIS version of StormCAD, but on it we used to delineate our sub areas of pervious and impervious with polylines, and enter each polyline area as a different line on the catchment dialog box, letting it calculate weighted C on its own. Once they went to their integrated GISey version of StormCAD, we dumped it because setting the models up took longer than the data entry used to in the older version.



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