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KaBone, Good thoughts. As it turns out our criterion is the 50-yr storm as well. It does hold all water generated by the 50-yr storm.

KaBone, Thanks for your input. The rim of the catch basin is higher than the storage system.

Can the catch basin of an underground chamber system be used as the overflow (primary outlet) of the chamber system? We designed a simple low volume stormwater detention system using the HydroCAD Chamber Wizard. It's 24" pipe and stone in well drained soils and holds the entire volume of the...

Peter, Thanks for your direction. I'll reach to some colleagues.

He may be new, and only familiar with more popular systems. Maybe he thinks it won't work or needs a better overflow device. I think it will work fine as designed. There are no warnings from the software.

I designed a 24" pipe detention system using the Chamber Wizard. It detains the design storm but I used the catch basin grate as the overflow (outlet) device for storms that exceed the design storm. A city engineer indicated that this is unusual and I should reconsider this approach. Are his...