Infiltration Basins - Contributing Drainage Area - Maryland
Infiltration Basins - Contributing Drainage Area - Maryland
(OP)
What is the allowable maximum drainage area for infiltration basins? I'm looking at the Virginia BMP Clearinghouse specs and they say 2 acres Maryland's manual is conflicting - it says no more than 5 acres in one section and then no more than 10 acres in another section. And of course I have a designer pushing the limit and trying to do it for 13 acres. Do you guys ever justify higher drainage areas when you have high infiltration rates, say 4.91 in/hr? min rate is 0.5 in/hr.





RE: Infiltration Basins - Contributing Drainage Area - Maryland
In SEPA ... we have been hanging our hats on this for quite some time: Link
It says DRAFT because it is not Official PADEP guidance, but it has been widely used for quite some time now.
RE: Infiltration Basins - Contributing Drainage Area - Maryland
RE: Infiltration Basins - Contributing Drainage Area - Maryland
RE: Infiltration Basins - Contributing Drainage Area - Maryland
Now, the only infiltration practices used in Maryland are Infiltration Trench and Infiltration Basins. MDE may allow a higher infiltration rate with a higher drainage area if you show that the "extra" drainage area is mostly open space/Pervious areas.