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  1. PMAB32

    Infiltration Basins - Contributing Drainage Area - Maryland

    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...
  2. PMAB32

    TR-55 - Runoff Curve Number

    Hey guys, Question for you. when I use rational method, I'm used to just looking at the drainage area and visually determining what percentage of the land is residential vs. forested, vs. grass and coming up with a composite C value. But when we do RCN number sometimes I've seen where people...
  3. PMAB32

    multiple flows to one outfall

    Hello. I am looking at multiple ponds, some of which are interconnected but then at the end of the line I have like 3 or 4 outflows from those ponds going to one outfall so when I'm looking at how much water is being introduced to that single outfall how do I combine those flows? I can't simply...

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