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)

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

Little Road-Pond IIIA, Pasco County, FL

Little Road-Pond IIIA, Pasco County, FL

Floats skim debris!!

Traditional Control DeviceVolume=Inflow-Outflow

Thirsty Duck Buoyant DeviceVolume=Inflow-Outflow

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 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 Flow Restrictor

ER Series Flow Restrictor

ER Series Flow Restrictor(one float removed)

ER Series Inlet Sleeve

ER Series Inlet Sleeve(underside)

6.45

6.52

6.59

6.66

6.73

6.80

6.87

6.94

7.01

7.08

7.15

7.22

7.29

7.36

7.43

7.50

7.57

7.64

7.71

7.78

7.85

7.92

7.99

8.06

8.13

8.20

8.27

8.34

8.41

8.48

8.55

8.62

8.69

8.76

8.83

8.90

0

5

10

15

20

25

THIRSTY DUCK ER-200HDischarge v. Stage

THIRSTY DUCK

STANDARD WEIR

Stage (ft NGVD)

Dis

char

ge

(cfs

)

ER Series: Rating Curve (Free Discharge Condition)

6.45

6.52

6.59

6.66

6.73

6.80

6.87

6.94

7.01

7.08

7.15

7.22

7.29

7.36

7.43

7.50

7.57

7.64

7.71

7.78

7.85

7.92

7.99

8.06

8.13

8.20

8.27

8.34

8.41

8.48

8.55

8.62

8.69

8.76

8.83

8.90

0

5

10

15

20

25

THIRSTY DUCK ER-200HDischarge v. Stage

THIRSTY DUCK

STANDARD WEIR

Stage (ft NGVD)

Dis

char

ge

(cfs

)

ER Series: Rating Curve (Submerged Interstitial Opening)

Submerged Interstitial Opening

ER Series: Rating Curve (Submerged Inner Orifice)

6.45

6.53

6.61

6.69

6.77

6.85

6.93

7.01

7.09

7.17

7.25

7.33

7.41

7.49

7.57

7.65

7.73

7.81

7.89

7.97

8.05

8.13

8.21

8.29

8.37

8.45

8.53

8.61

8.69

8.77

8.85

8.93

9.01

9.09

0

2

4

6

8

10

12

14

16

18

20

THIRSTY DUCK ER-200HDischarge v. Stage

THIRSTY DUCK

STANDARD WEIR

Stage (ft NGVD)

Dis

char

ge

(cfs

)

Submerged Inner Orifice

Submerged Interstitial Opening

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.

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How does the TD Series work?

The Body and the Nest...

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!