# US 2011/0076100 A1 · Flow control system for a detention pond > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2011/0076100 A1 - Document ID: US20110076100A1 - Status: Published application - Kind: A1 - Application number: 12/570,734 - Filed: 2009-09-30 - Published: 2011-03-31 - Earliest claimed: 2009-09-30 - Assignees: Early Riser, Ltd - Inventors: Jonathan D. Moody - Web page: https://patentgrep.com/patent/US20110076100A1 ## CPC - E03F 5/105: {Accessories, e.g. flow regulators or cleaning devices} - Y10T 137/86252: Float-supported outlet - E03F: SEWERS; CESSPOOLS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract An application for a flow control system includes a movable plunger held within a stationary riser, the stationary riser being in fluid communication with a drainage system. The movable plunger is buoyant, assisted by one or more attached floats such that, when the liquid level around the flow control system increases to a pre-determined level, the movable plunger lifts due to the buoyancy, thereby maintaining the pre-determined distance between the surface level and a bottom surface of the movable plunger, keeping the flow rate at an approximately constant level independent of the water level. ## Claims ### Claim 1 A flow control system for integration into a detention pond, 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 vertical, a top end of the stationary riser has a rim and the opposing end of the stationary riser is fluidly connected to a drainage system; a movable plunger, the movable plunger fitting in place within the stationary riser hollow core defining a gap area between an outer surface of the movable plunger and an inner surface of the stationary riser hollow core, whereas liquid from the detention pond flows over the rim, through the gap area, through the hollow core and into the drainage system; and at least one float interfaced to the movable plunger, the at least one float providing buoyancy to the movable plunger. ### Claim 2 (depends on 1) The flow control system of claim 1, wherein the rim is horizontally flat. ### Claim 3 (depends on 1) The flow control system of claim 1, wherein the rim is horizontally angled. ### Claim 4 (depends on 1) The flow control system of claim 1, wherein the rim includes one or more notches. ### Claim 5 (depends on 1) The flow control system of claim 1, wherein the at least one float consists of a single float ring held on an outside surface of the movable plunger. ### Claim 6 (depends on 5) The flow control system of claim 5, wherein the float ring is held on the outside surface of the movable plunger by friction and the float ring is positionally adjustable in a vertical direction along the outside surface of the movable plunger. ### Claim 7 (depends on 1) The flow control system of claim 1, wherein the at least one float consists of two buoyant members interfaced to the movable plunger by shafts. ### Claim 8 (depends on 1) The flow control system of claim 1, wherein the at least one float consists of three buoyant members interfaced to the movable plunger by shafts. ### Claim 9 (depends on 8) The flow control system of claim 8, wherein the shafts provide a means for adjusting a height of the buoyant members with respect to the movable plunger. ### Claim 10 (depends on 1) The flow control system of claim 1, further comprising a skimmer operatively coupled to the movable plunger and moving vertically in step with the movable plunger. ### Claim 11 (depends on 1) The flow control system of claim 1, further comprising a stop to prevent the movable plunger from lifting out of the stationary riser hollow core. ### Claim 12 A flow control system for integration into a detention pond, the flow control system comprising: a holding box, the holding box installed in a bed of the detention pond, the holding box having an interior cavity and at least one opening in communication with liquid contained in the detention pond; a stationary riser positioned within the holding box, the stationary riser having a stationary riser hollow core, an axis of the stationary riser hollow core being substantially vertical, a top end of the stationary riser having a rim, the stationary riser hollow core fluidly connected to a drainage system; a movable plunger, the movable plunger fitting within the stationary riser hollow core to form a gap area between an inner surface of the stationary riser hollow core and an outer surface of the movable plunger; and at least one float interfaced to the movable plunger, the at least one float providing buoyancy to the movable plunger; whereas liquid from the detention pond flows over the rim and through the gap area and through the stationary riser hollow core and into the drainage system. ### Claim 13 (depends on 12) The flow control system of claim 12, wherein the rim is horizontally angled. ### Claim 14 (depends on 12) The flow control system of claim 12, wherein the at least one float consists of a float ring held on an outside surface of the movable plunger. ### Claim 15 (depends on 14) The flow control system of claim 14, wherein the float ring is held on the outside surface of the movable plunger by friction and the float ring is positionally adjustable in a vertical direction along the outside surface of the movable plunger. ### Claim 16 (depends on 12) The flow control system of claim 12, wherein the at least one float consists of two buoyant members interfaced to the movable plunger by shafts. ### Claim 17 (depends on 12) The flow control system of claim 12, wherein the at least one float consists of three buoyant members interfaced to the movable plunger by shafts. ### Claim 18 (depends on 16) The flow control system of claim 16, wherein the shafts provide a means for adjusting a height of the buoyant members with respect to the movable plunger. ### Claim 19 A flow control system for integration into a detention pond, the flow control system comprising: a holding box, the holding box installed in a bed of the detention pond, the holding box having an interior cavity, a top surface of the holding box having a rim, and the holding box in fluid communications with a drainage system; a movable plunger, the movable plunger fitting within the interior cavity of the holding box to form a gap area between an inner surface of the interior cavity and an outer surface of the movable plunger; and at least one float interfaced to the movable plunger, the at least one float providing buoyancy to the movable plunger; whereas liquid from the detention pond flows over the rim and through the gap area and through the stationary riser hollow core and into the drainage system. ### Claim 20 (depends on 19) The flow control system of claim 19, wherein the movable plunger further comprises a skimmer, the skimmer extending from a top surface of the movable plunger and partially covering a top outside surface of the holding box, reduce floating material flow into the holding box, the skimmer spaced apart from the outside surface of the holding box permitting liquid to flow between the skimmer and the outside surface of the holding box.