Transcript 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>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 Device
Volume=Inflow-Outflow
Thirsty Duck Buoyant Device
Volume=Inflow-Outflow
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.
Single
Flow Restriction
Dual
Flow Restriction
Moving
Annular Restriction
Fixed
Annular 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
6.53
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
Discharge (cfs)
ER Series: Rating Curve
(Free Discharge Condition)
THIRSTY DUCK ER-200H
Discharge v. Stage
25
20
15
THIRSTY DUCK
STANDARD WEIR
10
5
0
Stage (ft NGVD)
ER Series: Rating Curve
(Submerged Interstitial Opening)
THIRSTY DUCK ER-200H
Discharge v. Stage
25
Submerged Interstitial Opening
15
THIRSTY DUCK
STANDARD WEIR
10
5
0
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
Discharge (cfs)
20
Stage (ft NGVD)
ER Series: Rating Curve
(Submerged Inner Orifice)
THIRSTY DUCK ER-200H
Discharge v. Stage
20
Submerged Interstitial Opening
18
16
12
THIRSTY DUCK
10
STA NDA RD WEIR
Submerged Inner Orifice
8
6
4
2
0
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
Discharge (cfs)
14
Stage (ft NGVD)
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.
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
Makes Ponds Smaller!
9400 River Crossing Blvd. Suite 102
New Port Richey, FL 34655
(727) 376-2400 telephone
(727) 376-5973 facsimile
www.Thirsty-Duck.com