Flow control system for a detention pond

摘要

A flow control system of the present invention includes a movable riser slideably engaged with a stationary riser and having a flange. The stationary riser is interfaced to a downstream drainage system. The movable riser is made buoyant by one or more floats such that, as the water level around the flow control system changes, the movable riser follows the changes based upon the buoyancy of the float(s), thereby maintaining the flange at a constant depth. The gap between an upper edge of the flange and the inner perimeter of the stationary riser coupled with an area of the gap defines a flow rate that is constant. Vents couple an inner cavity of the movable riser to air above the fluid, the inner cavity being in communication with the drainage system as well.

主权项

1. A 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 along the axis, the movable riser having a flange, the flange defining a gap between an outer edge of the flange distal from the drainage system and the stationary riser hollow core, the movable riser having a cavity, the cavity open and in fluid communication with the stationary riser hollow core; a vent providing fluid communication between an area above a fluid level of the detention pond and the cavity within the movable riser, thereby permitting air to enter the cavity of the movable riser; and at least one float interfaced to the movable riser, the at least one float providing buoyancy to the movable riser, raising the movable riser responsive to increases in the fluid level in the detention pond and lowering the movable riser responsive to decreases in the fluid level in the detention pond.