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  • While I'm unsure of your local regulations, some jurisdictions view stormwater differently depending on source. For example, in Washington State, runoff from vehicle space and chemically-treated landscaping is viewed as pollution-generating, which requires water quality treatment in addition to flow ...

  • Similar to the prior idea, you could have a roof drain that goes to a ground-level biofiltration chamber, like a tree box filter or other similar device.  After some amount of ground-level treatment it can discharge to the storm drain.  Also, on the roof, suggest some additional physical barriers close ...

  • James, Interesting idea.  We don't normally allow septic tanks in the city (we're a very urban city with sanitary sewer system available throughout the city for all development to connect to) so this isn't something we had thought of.  We'll have to look into this some more. ------------------------------ ...

  • Justin,  Have you done a natural systems approach on a rooftop?  Like a different type of green roof coupled with the dog park? ------------------------------ Sara DeGroot ENV SP, P.E., M.ASCE CIVIL ENGINEER III Alexandria VA ------------------------------

  • Haven't run into this situation but it sounds like the perfect fit for a stormwater detention tank at ground level perhaps with a septic tank on the outlet end or built in to the detention tank. The septic part could be connected to the Sanitary Sewer system. ------------------------------ James Anderson, ...

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  • Sara, This is a unique problem, but one that we've run into before.  You're right that many dog parks on ground level have area drains that go directly to storm.  Whether you're allowed to go to storm versus sanitary is likely going to be dependent on the location of the project.  If a city has a combined ...

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