City of Fort Worth Case Study - Freese and Nichols, Inc. Hydraulic...City of Fort Worth Case Study ....
Transcript of City of Fort Worth Case Study - Freese and Nichols, Inc. Hydraulic...City of Fort Worth Case Study ....
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Dynamic Hydraulic Modeling of a
Wastewater Treatment Plant City of Fort Worth Case Study
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AGENDA
• Drivers for a Dynamic Integrated Large
WWTP Hydraulic Model
• Model Development
• Modeling Conduits and Bends
• Modeling Primary Clarifiers
• Modeling Filters and Chlorine Contact
Basins
• Integrating Collection System
Hydraulics with WWTP Hydraulics
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DRIVERS FOR A DYNAMIC INTEGRATED
LARGE WWTP HYDRAULIC MODEL
• Fastest Growing WWTP Service Area in the USA
– 5 MGD to 166 MGD over the last 50 years with significant
future growth still expected
• Need to evaluate capacity of treatment facilities with
aging infrastructure and budget constraints
• Need to Integrate Collection System and Treatment
Improvements to Minimize Overall CIP Needs
• Recognition that WWTP Facility is facing substantial
regulatory changes over the next 10 year planning
horizon
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History of Fort Worth • City of Fort Worth was first incorporated in
1873 with a population of 500.
• Over the past 130 + years, Fort Worth has
grown to 736,000 people.
• City of Fort Worth is now the 16th largest City
in the nation.
• City of Fort Worth provides Wastewater
service to over 1,000,000 people.
• City of Fort Worth has 24 wastewater
wholesale customers.
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Fort Worth's first City Hall at 2nd and
Rusk (now Commerce) streets housed all
municipal offices, including Police and
Fire departments from 1877 to 1893
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Village Creek Reclamation
Facility Service Area CITY SERVICE AREA POPULATION
GROWTH HAS AVERAGED 25,000 PEOPLE
PER YEAR OVER THE LAST DECADE
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1972
45 mgd
1958
5 mgd
1999
166 mgd
1988
129 mgd
1980
96 mgd
2005 HRC &
Screening Facility
Village Creek Wastewater Treatment Facility History
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126 state certified
operators, mechanics
and administrative staff
NACWA Platinum Award
20 consecutive years of 100%
permit compliance
Award Winning Village Creek
Reclamation Facility
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EXISTING HYDRAULIC MODEL
• Excel based
• Sound engineering
model
• Limitations:
– Non-dynamic
simulation
– Difficult to complete
“what-if” analysis
– Dynamic connection
to collection system
model not possible 8
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DYNAMIC HYDRAULIC MODEL
• Advantages
– Dynamic, varying flow input
– Total data management
– Collection system model tied directly
to treatment facility model
– “what-if” analysis is more feasible
– Improved graphic outputs
– Functional model for city after
master plan
– Ability to evaluate Peak Flow
capacity needs as well as Permitting
capacity needs
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MODEL DEVELOPMENT
• Digitized Sewer Lines, Junction Boxes,
Facilities in GIS
• GeoReferenced Plant Layout into
InfoWorks CS
• Worked with Plant Staff to verify
alignments and flow splits
• Attributed pipe diameters, lengths,
inverts, manhole rim elevations, etc.
• Surveyed Junction Boxes and
Researched Record Drawings
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FIELD DATA AND CALIBRATION • Need three pieces of Field Data:
– Water Surface Elevations
– Flow Rates
– Plant Controls (Gate Settings,
Overflow Settings, etc.)
• A Surveyor can shoot the water
surface elevations (WSE) relatively
easy
• Surveyor must record the time
each WSE is shot so it can be tied
back to a flow
• Most larger WWTPs have flow
meters placed throughout the plant
and can provide flow data
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VILLAGE CREEK WWTP
MAJOR COMPONENTS
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HYDRAULIC MODELING: CONDUITS AND BENDS
Bend 2 45o
Bends
Sharp Edged
Entry Loss
Exit Loss
Headloss Type K value
Exit Loss 1.0
45o Bend (x2) .4
Sharp Edged Entry Loss .5
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HYDRAULIC MODELING:
PRIMARY CLARIFIERS • Used Series of Weirs Method
– Storage node used to model the primary clarifier
with dimensions found in As Built plans
– V-Notch Weir links used to model the Primary
Clarifier Weir
• Equally divided Primary Clarifier weir length and number
of notches
– 10 weir links for the 160 ft Primary Clarifiers
– 1 weir link for the 80 ft Primary Clarifiers
– Open Channel Shape conduit used to model the
Primary Clarifier Effluent Channel with the
dimensions found in As Built plans
– V-Notch Weir link connects Storage node to Open
Channel Shape conduit
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Primary
Clarifiers
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HYDRAULIC MODELING:
PRIMARY CLARIFIERS
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PRIMARY CLARIFIERS
Primary Influent Piping
V-Notch Weirs
Primary Effluent Channel
PE PS #2 Wet Well Outfall
Primary Effluent Piping
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Storage
Node
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PRIMARY CLARIFIERS
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HYDRAULIC MODELING: FILTERS
• Use the User Control Link to model the Filter
Media.
– Need the Filter Media Headloss vs Flow
• Doesn’t account for the gradual increase in
headloss as the filter binds
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Deep Bed
Media Filter
Model
HYDRAULIC MODELING: FILTERS
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Final Clarifier
#18 Effluent Box
Deep Bed
Media
Filter
Chlorine
Contact Basins
Influent Box Bypass Channel
Filter
Backwash
Pump Station
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96”/72”
conduit 15’/20’
channel
Alternative #1 Alternative #2
HYDRAULIC MODELING: FILTERS
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HYDRAULIC MODELING:
CHLORINE CONTACT BASINS
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Funding and
Cost
Recovery
Options
COMPREHENSIVE
CAPITAL
IMPROVEMENT
PLAN
Population Data
Review & Wastewater
Flow Projections
GIS Coordination
Flow
Monitoring
& Model
Calibration
Wastewater
Collection
Planning
Risk Based
Assessment
Wastewater
Model
Development
Wastewater
Treatment
Planning
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WASTEWATER MASTER
PLAN PROCESS
Strategic Planning
INTEGRATING COLLECTION SYSTEM
HYDRAULICS WITH WWTP HYDRAULICS
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INTEGRATING COLLECTION SYSTEM
HYDRAULICS WITH WWTP HYDRAULICS • Advantages of Integrated
Model
– Dynamic Modeling • Extended Period Simulations
• Alternative modeling for future
improvements
• Flow splits and WSE projections
were determined in the model
• Near Term improvements developed
and phased
– Model Results • Influent piping can handle near term
peak wet weather flows
• Recommended improvements at the
plant reduce collection system
improvements (lowers HGL)
– Comprehensive CIP
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Acknowledgements • Fort Worth Water Department
– Frank Crumb
– Buster Fichera
– Jerry Pressley
– Ron Carlson
– Gary Lagasse
– Nowzar Dinyarian
– David Townsend
• Freese and Nichols, Inc. – David Jackson
– Jessica Brown
– Steven Rhodes
– Cullen Carlson
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QUESTIONS
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Mazen Kawasmi, P.E. Freese and Nichols, Inc. [email protected]
Andy Cronberg, P.E. Fort Worth Water Department
Thomas Haster, P.E. Freese and Nichols, Inc. [email protected]
Buster Fichera Fort Worth Water Department