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Concrete Reservoirs(Every Tank is Unique)
Date Title 2
Garden Home
5th Street Reservoir
Waluga Reservoir #2
5th Street Lebanon
Date Title 3
5th Street Lebanon
Date Title 4
Waluga Reservoir #2
Date Title 5
OBEC’s OFFICE
Waluga Reservoir #2
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Garden Home
Date Title 7
Garden Home
Date Title 8
Reservoir Facts
5th StreetType: Prestressed
Height: 45’
Diameter: 124’
Volume: 4MG
Roof Type: Flat Slab
Seismic: 0.67g
Bid Cost: $1.9M
Waluga #2Type: Prestressed
Height: 36’
Diameter: 131’
Volume: 3.5MG
Roof Type: Dome
Seismic: 0.98g
Bid Cost: $2.0M
Garden HomeType: Prestressed
Height: 37’-5”
Diameter: 89’-4”
Volume: 1.75MG
Roof Type: Flat Slab
Seismic: 0.97g
Bid Cost: ~$1.8M
Why Prestressed Concrete?
1
Reservoir Options
Fiberglass
Steel
Concrete
Bolted
Welded
Cast-in-Place
Prestressed
Bolted Steel
Welded Steel
Cast-in-Place Concrete
Date Title 14
Prestressed Concrete
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Types of Prestressed TanksPrestressed
Wire Wrapped Post Tensioned
Types of Prestressed Tanks
Type I Type II Type III Type IV D115
Advantages of Prestressed
• Low Initial Cost*• No Coating Requirements• Low Maintenance• Long Life • Good Water Tightness• Good Seismic Performance
Reservoir Type by Size
0
0.5
1
1.5
2
2.5
3
3.5
44+
Cap
acity
(MG
)
Pre-stressed Cost EfficiencyC
apac
ity (M
G)
D/H Ratio
0
2
4
6
8
10
1 1.5 2 2.5 3 3.5 4
5th Street
• 4 Million Gallons of Storage• Alternatives Study• Cost/Maintenance
WR2
• 3.5 Million Gallons• WR1 - Concrete• Cost / Maintenance
Garden Home
• Replacing 2 Steel Tanks• Existing Site• 1.75 Million Gallons• Owner Preference
Structural Design Considerations
2
Design Considerations
Structural Considerations• Design Criteria• Floor/Foundation• Roof Type• Seismic Detailing• Construction Staging
Non-Structural Design Considerations
3
Design Considerations
Non-Structural Considerations• Tank Mixing• Aesthetics• Piping• Instrumentation• Bidding/Schedule• Public Involvement
5th Street Lebanon
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• Site Layout• Piping• Alternate Bidding
5th Street Lebanon (Site Layout)
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2MG
New 2MG Tank #2
New 4MGTank
New 2MG Tank #1
New 4MGTank
5th Street Lebanon (Piping)
Date Title 30
2MG
New 4MGTank
5th Street Lebanon
Alternative Bidding:D115 vs D110 Type 1
Waluga Reservoir 2
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• Foundation• Roof Type• Site Constraints• Public Involvement*
WR2 (Foundation)
WR2 (Dome Roof)
WR2 (Site Constraints)
Garden Home
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• Seismic Detailing• Aesthetics• Tank Mixing
Garden Home (Seismic)
Garden Home (Seismic)
Garden Home (Seismic)
Garden Home (Seismic)
Cable Specs
Diameter = 0.6”Spacing = 4-ftStrand/bundle = 10
Garden Home (Seismic)
Garden Home (Aesthetics)
Garden Home
Date Title 43
Garden Home (Tank Mixing)
Garden Home (Tank Mixing)
Passive vs. Active Mixing
Conclusions
• Strong Partnerships• Collaboration leads to Innovation• Every tank is unique
