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Different Ia/S Values in Same File

Different Ia/S Values in Same File

Different Ia/S Values in Same File

Our local jurisdiction dictates that we use a different Ia/S value for a water quality event versus water quantity events.
Is it possible in HydroCAD to have those different runs in the same file or do I have to separate those runs into two files (one for quality and one for quantity)?

RE: Different Ia/S Values in Same File

The same Ia/S value is used for all events in each file, so you'll have to use different files if you want to use different Ia/S values.

Also, note that a different Ia/S value may require different CN values. i.e. The CN values for a given ground cover and soil group are dependent on the Ia/S. Presumably this is addressed by your stormwater regulations.

Peter Smart
HydroCAD Software

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