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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>4.0 cfs)
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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>4.0 cfs) TD (Thirsty Duck) Series is a floating orifice attached to an expanding conduit (the “bellows”). (Use for flows< 4.0 cfs)
Benefits and Advantages • Maximize outflow rate to minimize total detention storage volume (Savings up to 50%). • Convert excess rate attenuation volume into water quality/treatment volume. • Lower peak design stages. • Cost savings • Reduce excavation, construction, fencing, and mowing costs • Reduce import fill requirements • Maximize land usage • Minimize volume of underground vaults or chambers • Corrosion Resistant • Frictionless • Fits in standard FDOT precast concrete boxes
Little Road-Pond IIIA, Pasco County, FL Floats skim debris!!
What is the ER Series? ER Series is a tube within a tube. Inner tube is buoyant Outer tube is stationary • For dual flow restriction, water passes through the buoyant tube AND 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.
SingleFlow Restriction DualFlow Restriction
MovingAnnular Restriction FixedAnnular Restriction
ER Series: Rating Curve (Submerged Interstitial Opening) Submerged Interstitial Opening
ER Series: Rating Curve (Submerged Inner Orifice) Submerged Interstitial Opening Submerged Inner Orifice
What is the TD Series? ` • TD Series is a buoyant pvc module 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 12” diameter (4.0 cfs max. discharge) • The “Duck” body rests in its “Nest” when it’s not floating • Uses standard Sch. 80 pvc flange to connect to outfall system • Fits in FDOT standard P-box or Type D inlet • Device is self-skimming. Water enters the module from its underside.
Can I get a permit? • SWFWMD has issued three (3) ERP's for Thirsty Duck (other permit applications are pending). • SJRWMD requests applicants schedule a pre-application conference prior to design (Mike Register, Kirby Green) • SFWMD has indicated it will permit the devices for governmental entities. Pre-application conference recommended. (Tony Waterhouse) • Pasco County has permitted Thirsty Duck. (application pending in Manatee Co.) • FDOT Specifications and Pay Item No. currently pending approval (sponsored by Rick Renna, FDOT State Drainage Engineer) • Washington State D.O.T., Cities of Olympia, Bellingham, Everett, Burlington, Ferndale, WA (and others)
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
9400 River Crossing Blvd. Suite 102New Port Richey, FL 34655(727) 376-2400 telephone(727) 376-5973 facsimilewww.Thirsty-Duck.com Makes Ponds Smaller!