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Flow arrows also need to be shown on the storm drainage plan, particularly along the west property line. It must be <br /> made clear that the parking lot runoff will not sheet flow into the alley. <br /> Although not technically required for a private property installation, I recommend that the restrictor device and outlet <br /> pipe be constructed with 8" diameter pipe, instead of 6", because the system will receive runoff from a paved area. <br /> 2 AA) <br />