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I couldn't find a way to edit my post, so, In the link above look under, Stormwater Policies & Guidance

Here is a link to DEP's stormwater site, http://mass.gov/dep/water/laws/policies.htm#storm

Here is a simple on-line one, http://www.groundwatersoftware.com/calculator_9_hantush_mounding.htm I use "Modret" to iterate the mounding calc's using output from "HydroCAD" hydrographs. However, "Modret is a pain in the "A**" and sometimes does not work. They should have a better method...

TerryScan, Thanks for the reply, your answer is very helpful to me. Walter

TeryScan, In your example, you are using the bioretention facility for storm water treatment only. You do not use the infiltration as part of a groundwater recharge calculation because the stone is infiltrating to the outlet pipe? We are placing our subdrain a foot above the bottom of the...