Patent ID: 8591148

Claim:
A multi-rate flow control system for integration into a detention pond and/or surge tank, the flow control system comprising: a stationary riser, the stationary riser having a stationary riser hollow core, an axis of the stationary riser hollow core being substantially vertical, an upper end of the stationary riser having an upper edge and a lower end of the stationary riser hollow core fluidly connected to a drainage system; a movable riser, the movable riser suspended within the stationary riser and movable vertically within and above the stationary riser, the movable riser having a plurality of flow rate restrictors; and at least one float interfaced to the movable riser, providing buoyancy to the movable riser, raising the movable riser responsive to increases in a fluid level in the detention pond and lowering the movable riser responsive to decreases in the fluid level in the detention pond; whereas a fluid flows from the detention pond and/or surge tank through a space between the stationary riser and the movable riser.