Patent ID: 7988870

Claim:
A device adapted to be installed in a drain inlet vault so water flows through the device and exits the vault through an outlet in a sidewall of the vault, said outlet having a predetermined vertical dimension that establishes within the vault, when water fills the vault, a maximum water level and minimum water level, said device allowing water to flow there through at a maximum flow rate and at one or more treatment flow rates substantially slower than said maximum flow rate, and comprising a flow control chamber including a removably mounted permeable weir member, on at least one partially open inlet side of the chamber, an exit opening on an outlet side of the chamber, and an internal flow diverting member between the inlet side and the outlet side, a hydrocarbon collection media carrier removably positioned on an exterior of said chamber, when the chamber is attached to the sidewall, said permeable weir member and flow diverting member being substantially vertically oriented, said opening being aligned with the outlet in the sidewall so that essentially all the water flowing in the vault flows through the flow control chamber and said internal flow diverting member being upstream of the exit opening so that water is diverted in a downward direction by the flow diverting member prior to returning to upward flow direction prior to exiting through the exit opening, and at the maximum flow rate the bulk of the water flows over the top of the media carrier housing and over the permeable weir member into the flow control chamber upstream of the diverting member.