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Mounding Calculations

Mounding Calculations

Mounding Calculations

In Massachusetts new stormwater management regs require that mounding calculations be performed under infiltration areas. HydroCAD does not do such calculations. Is there a simplified program commonly used that anyone can recommend?

Patrick C Garner Co., Inc.
Northborough, MA

RE: Mounding Calculations

Here is a simple on-line one,


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.

Mainly you need to do the mounding to figure the time it take to empty you detention area. All detention basins mound. There should be a general rule or chart to use provided by DEP to make it easier.

RE: Mounding Calculations

Hey pcgarner:

I am a EIT in mass, Can you tell where is the new reg. saying we need to the mounding calculation?


RE: Mounding Calculations

Read Vol III of the revised Stormwater Management regs (now a regulation, not a policy). Any infiltration device used to modulate a 10-year or greater storm must have mounding calcs performed.

Patrick C Garner Co., Inc.
Northborough, MA

RE: Mounding Calculations

I couldn't find a way to edit my post, so,

In the link above look under, Stormwater Policies & Guidance

RE: Mounding Calculations

The Hantush procedure is on the wish-list for the next HydroCAD release.  Other suggestions are always welcome.

Peter Smart
HydroCAD Software

RE: Mounding Calculations

The sooner the better! You'll have engineers all over the state cheering you. And yes, Hantush is the DEP-recommended methodology.

Patrick C Garner Co., Inc.
Northborough, MA

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