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Obviously, there will be a runoff component, but the presence of the tiles means that the soil will not exhibit standard runoff behavior...

Assuming that the equalizer pipe is adequately sized, modeling as a single pond is recommended for simplicity and stability. Modeling...

Just use an exfiltration outlet, possibly routed to a culvert outlet (if you want to check for possible culvert control.) All in the...

Since the media layer is generally the outlet control (using exfiltration), the pond storage storage should include only the volume...

OK, so the "outlet pipe" at the bottom of the control structure is the final discharge, and the bioretention area is basically "offline"...

The connecting pipe is easy. That's just a culvert outlet from the first (dry) pond. But you seem to be also be feeding water through...

As swazimatt points out, you also need to consider the available storage. Assuming that you are trying to limit (regulate) the flow to...

I suspect that the pipe diameter will become the limiting factor before the perforations or flow rate through the gravel. Otherwise you...

When configuring any outlet setup, start at the final device and work backwards towards the pond storage. For example...

Not sure exactly what "issues" you're trying to address. Normally you would set the starting elevation to the permanent pool. But your...

There are lots of hidden complications with the Rational method, which is why we recommend the SCS/NRCS method instead...

You would probably need to model the space upstream of wall (A) as a separate pond. But then you'll have to deal tailwater issues. I...

The weir and orifice can both be primary, routed to the control structure. Just one culvert, leaving the control structure. Don't...