9400 River Crossing Blvd. Suite 102New Port Richey, FL 34655(727) 376-2400 telephone(727) 376-2411 facsimilewww.Thirsty-Duck.com

Makes Ponds Smaller!

Buoyant Flow Control● Flow restriction moves with water

surface elevation (constant head)

● Constant Head = Constant Flow

● Two device types: ER (Early Riser) Series is a buoyant tube within a stationary tube. (Use for flows>3.0 cfs)

TD (Thirsty Duck) Series is a floating orifice attached to an expanding conduit (the “bellows”). (Use for flows< 3.0 cfs)

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ER Series

TD Series

Traditional Outlet Control DeviceStorage Volume=Inflow-Outflow

Thirsty Duck BFDStorage Volume=Inflow-Outflow

Benefits and Advantages• Minimize total detention storage volume

(Savings up to 50%)• Maximize land usage

(Additional impervious surface, Higher CN or C)• Minimize volume of underground vaults or chambers

(Expensive storage-$$$)• Maximize water quality treatment volume

(Less volume needed for flood attenuation)• Lower peak design stages

(Solve flooding problems)(Reduce import fill requirements)

• Construction cost savings(Reduced excavation, grading, slope stabilization, fencing)

What is the ER Series?

ER Series is a tube within a tube.

Inner tube is buoyantOuter tube is stationary

•For dual flow restriction, water passes through the buoyant tubeAND the annular space between the tubes.

•For single flow restriction, water passes through the annular space ONLY.•Tubes can have round or rectangular shaped cross sections•Tubes of varying cross section produce constant flow rate. Tubes of constant cross section produce varying flow rate.

ER-200 Series (single restriction)

ER-200 Series (dual restriction)

What is the TD Series?• TD Series is a buoyant body housing an orifice• Buoyant module is connected to an expanding conduit (“the bellows”)• Bellows fabricated from high strength, welded polyurethane with stainless steel reinforcing rings in each pleat• Bellows available up to 14” diameter (3.0 cfs max. discharge)• The “Duck Body” rests in its “Nest” when it’s not floating• Uses standard flange to connect to outfall system• Device is self-skimming. Water enters the body from its underside.

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TD Series

Little Road-Pond IIIA, Pasco County, FL

Lakewood Ranch Toyota, Manatee County, FL

Bellingham International Airport, Bellingham, WA

Rating Curve (Free Discharge Condition)

Submerged Interstitial Opening

Rating Curve (High Tailwater Condition)

How can we help?• Three company principals are FL licensed, experienced drainage engineers.

• Provide design details, hydraulic analysis and technical support• Assist with agency permitting and coordination• Live demonstration – Test station located in Oldsmar, FL• Basic data to get us started:

•Pond Bottom Elevation•Water Quality Elevation•Proposed TOB/DHW Elevation•Allowable peak discharge rate•Tailwater Elevation