sewergems/stormcad composite q

Question

Our local agency is requesting a composite q for runoff instead of a composite CN. Do Bentley products have this capability?

Jesse Dringoli · Answer

I agree with the others - more specifics on your requirements will help us provide an accurate answer, or define your requirements for development consideration. Which numerical solver (Rational for peak flow?), how is this weighting expected to work and which results does it apply to? Without this we can only guess as to what you need. 
 I am not certain at this point, but you may want to take a look at the subarea feature or consider the points in this article: Multiple CN numbers for a catchment and multiple catchments with a single outlet node

Jesse Dringoli · Answer

Brian, our product managers will look into this and prioritize for a potential future release - this is recorded with reference # 538362 which I have attached to a new Service Request opened on your behalf, so that you will receive an email alert if this is implemented in a future release. 
 In the meantime, the solution you can use is to model each land type as a separate catchment area, with its "Outflow Element" set to a single common discharge point (the same that you would have chosen for the single catchment). This will also enable you to align your model more closely to the real system (by drawing the catchment polygons for each type of land). 
 I have documented this in the following article in our Wiki: Using the Weighted Q method for catchment runoff

sewergems/stormcad composite q

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