Flow Control System

A flow control system for integration into a reservoir, the flow control system comprising:

• a container, the container being in communication with the fluid in the reservoir, having an overflow weir, positioned at a prescribed level through the wall of the container, the container having an interior being maintained at an ambient, atmospheric pressure, being fluidly connected to a downstream drainage system;
• a closed conduit having an upstream and inlet end opening into a reservoir and having a downstream and outlet end within said container interior, an axis of which is vertical, opening upward;
• a pressure vessel, an axis of which is vertical, having an interior, enclosed by an upper surface, lower surface and a vertical surface which joins the lower surface to the upper surface, the pressure vessel lower surface having at least one opening larger than the outside dimension of the closed conduit, through which the pressure vessel is slideably engaged over the exterior of the downstream and outlet end of the closed conduit;
• a means to restrain the pressure vessel from significant lateral movement, yet which allows the pressure vessel to move vertically, said means being affixed and made stationary within the interior of the container;
• whereas fluid flows from the upstream reservoir through the closed conduit, upward into the pressure vessel, out through the at least one opening through the pressure vessel lower surface, into the container interior and out into the downstream drainage system;
• whereas when the fluid level in the reservoir rises above the prescribed level of the overflow weir, the fluid also flows over the overflow weir into the interior of the container and out into the downstream drainage system.