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Melissa Brunger, P.E.GAWP Fall Conference
November 14, 2017
presented by
Leveraging Hydraulic Models
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AGENDA
Hydraulic Modeling Applications
Case Studies
Conclusions/Lessons Learned
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• System curves for pump station design• Hydraulic grade lines (HGLs) for pipeline design• Siting and sizing of elevated storage tanks• Impact on water quality• Construction sequencing • Evaluate system operations
HYDRAULIC MODELING APPLICATIONS
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CASE STUDY 1: BY THE NUMBERS
30,000 = Connections
21 MGD = MD Demand
1 Surface Water Treatment Plant
17 Pump Stations
11 Pressure Zones (580’-1170’)
26 Storage Tanks
11 Wells
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• All-pipes InfoWater model (Innovyze)• Extended Period Simulation (EPS)
HYDRAULIC MODEL
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Supply diversification Growing system demand Less Regulated than Edwards Aquifer
Trinity Aquifer Purpose
Drilled in Spring 2011 Tested Capacity of 400 - 500 gpm
Test Well
Land purchased in Spring 2013 Started drilling additional wells in
2014 Coordination with FNI for Design
Moving Forward
PROJECT BACKGROUND
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Operational Modeling• Incorporate new
water supply• Evaluate various
demand conditions
Identify Improvements• Transfer valves• Piping
connections
System Curve Development• Existing and
10-year demands• Various static
head conditions
PRELIMINARY DESIGN
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• Static Head– Minimum– Average– Maximum
• Demand Conditions– Average Day – Maximum Day
• Operations– With transfers– Without transfers
SYSTEM CURVES
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Water age without Trinity supply
Water age with Trinity supply
WATER AGE ANALYSIS
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CASE STUDY 2: BY THE NUMBERS
Wholesale Provider
Serves More Than 1.6 Million People
77 Delivery Points
12” – 96” in Diameter
11 Remote and 8 High Service Pump Stations
Approximately 600 MGD MD Demand
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• All-pipes InfoWater model (Innovyze)
HYDRAULIC MODEL
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• Determine tank location, volume and elevations
REMOTE STORAGE TANK ANALYSIS
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• Determine ability to use one set of pumps to different service areas
PUMP STATION DESIGN: SYSTEM CURVES
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PUMP STATION DESIGN: 2020 OPERATIONS
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PUMP STATION DESIGN: 2040 OPERATIONS
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• Determine proposed pipeline flow and diameter• Confirm pressure class
PIPELINE DESIGN: HYDRAULIC GRADE LINES
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• Turn off Tawakoni HSPS
once per week
• Pump more consistently
using smaller pumps
• Operational strategies are
not necessary with the new
WTP and remote storage
OPERATIONAL IMPROVEMENTS
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CASE STUDY 3: BY THE NUMBERS
1.3 Million = Population
23 = Wholesale Customers
3 WTPs
22 Pump Stations
17 Pressure Zones
9 Elevated Storage Tanks
12 Ground Storage Tanks
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• 8,842,325 LF of modeled lines• H2OMAP Water model (Innovyze)• Extended period simulation model
HYDRAULIC MODEL
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• Evaluate operations and pressures for various elevated storage sites
ELEVATED STORAGE DESIGN
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• Evaluate pressures for various elevated storage sites
ELEVATED STORAGE DESIGN
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• Evaluate system operations without elevated storage
ELEVATED STORAGE DESIGN
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• Evaluate system operations for proposed tank sites
ELEVATED STORAGE DESIGN
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• Evaluate pressures when taking a pump station out of service to assist with pump station construction phasing
PS Online PS Out of Service
PUMP STATION DESIGN
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• Evaluate pressures when taking a pump station out of service to assist with ground storage construction phasing
Average Day Demand Peak Day Demand
GROUND STORAGE REHABILITATION
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• Evaluate use of a pump station without ground storage to assist with ground storage construction phasing
GROUND STORAGE REHABILITATION
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• Hydraulic modeling can lead to monetary payoffs providing optimized facility sizing and efficient operations over the life cycle of the asset
• Hydraulic modeling allows evaluation of a broad range of options at a relatively low cost
• Hydraulic modeling provides assurances that assumptions used for the design process are based on sound engineering analysis
• Hydraulic modeling results in increased design efficiency and confidence during the start-up process
CONCLUSIONS
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• May require additional time during design process
• Hydraulic model must be calibrated and up-to-date
• Coordination with operations staff is extremely important
• Hydraulic models provide more accurate system curves than spreadsheet calculations
• Hydraulic models have limitations and it is important to understand them
LESSONS LEARNED
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Melissa Brunger, [email protected]
(214) 217-23232711 North Haskell Ave. #3300
Dallas, Texas 75204
QUESTIONS?