hydraulic modeling of deep tunnels provides cost savings · 2011-05-10 · hydraulic modeling of...
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Hydraulic Modeling of Deep Tunnels Provides Cost Savings
Taymour El-Hosseiny, Karen Reinhart, EMH&T
M.P. Cherian, DLZ
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Overview
Background and CSO Long Term Control Plan (LTCP)
Review of Backbone Alternative Initial Solution Modified Solution Model Results Compare Costs of Proposed Solutions Conclusion
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P CSO
CSO Area
Legend
Existing Sewer Facilities Design Area
Main Trunk Sewers
CSO Locations, Columbus, OH
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Whittier Street Storm Tank Facility
Combined Sewer Area, Columbus, OH
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Whittier Street Storm Tanks
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Whittier Street Storm Tank Overflow Location
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Technologies Used in CSO LTCP
Transport and Treat (in-line storage)
High Rate Treatment (HRT)
Supported by Increase capture (open regulators)
Increase system storage (Raising weirs)
Source control (Inflow redirection)
Source Control (Complete sewer separation in cost effective areas)
Storage tanks
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Existing WSST Facility
Constructed in the late 1920s Along With the Olentangy-Scioto Intercepting Sewer (OSIS).
Three 1.3 mg (4,920 m3) Primary Treatment Tanks for Capturing and Treating Smaller Storm Events.
Direct Bypass for Storm Events that Exceeds Tank Flow Rate Capacity.
Baffles for Solids and Floatables Control
Effectiveness of Baffles Is Questionable.
1-Hour Detention at 100 mgd (4.38 m3/s).
Tank Overflows and Emergency Bypass are the Most Significant CSO Discharge in Columbus, OH.
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0
200
400
600
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1000
1200
1400
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1800
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37
Overflow Event
Cum
ulat
ive
Ove
rflo
w V
olum
e (M
G)
Cumulative Overflow at Whittier Street Storm Tanks for a Typical Year
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Estimated Annual CSO from Whittier Street Storm Tanks and OARS for a Typical Year
0
200
400
600
800
1000
1200
Year
CSO
(MG
)
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OSIS Augmentation Relief Sewer (OARS)
OARS Tunnel
OSIS
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OARS Near Surface Key Components
Whittier St. Storm Tanks O/F
Deshler Tunnel
Jackson Pike WWTP
Mechanical Bypass
OARS FDS
HRT (250 MGD)
Henry St Regulator
Chestnut St Regulator
Spring St Regulator
Long St Regulator
Broad St Regulator
Capital St Regulator
State St Regulator
Town St Regulator
Rich St Regulator
Peters Run Regulator
Whittier St Regulator
Moler St Regulator
10 MG storage
10 ft x 16 ft
(304 x 487 cm)
23,000 ft (7,010 m) of 10 x16 ft (304 x 487 cm) near surface
14 Relief structures
1 Access shaft
1 Pump Station
250 MGD (10.95 m3/s) High Rate Treatment
10 MG (37,850 m3) Storage facility
Pump Station (250 MGD)
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OARS
OARS Near Surface Approach
Sluice Gate
Input Sewer
Overflow Sewer
OSISInterception Connection
CSO Regulator
O/F
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OSIS Performance with Near Surface OARS
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Risks for Open Cut Options
Delays with flooding of construction site
Disruption of downtown streets
Congestion caused by construction traffic
Extensive relocation of utilities
Construction difficulties in crossing river and railroad tracks
Issues with contaminated soils in railroad yards
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Possible Construction Methods for OARS
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Sluice GateOverflow Sewer
OSISInterception Connection
CSO Regulator
O/F
OARS
Input Sewer
Updated OARS Tunnel Approach
River
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OARS Tunnel Key Components
Whittier St. Storm Tanks O/F
Deshler Tunnel
Jackson Pike WWTP
Mechanical Bypass
OARS FDS
10 MG storage
HRT (250 MGD)
FM
Henry St Regulator
Chestnut St Regulator
Spring St Regulator
Long St Regulator
Broad St Regulator
Capital St Regulator
State St Regulator
Town St Regulator
Rich St Regulator
Peters Run Regulator
Whittier St Regulator
Moler St Regulator
20-ft (614 cm)
Tunnel
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OARS Tunnel Key Components
10 MG storageWhittier St. Storm Tanks O/F
Deshler Tunnel
Jackson Pike WWTP
Mechanical Bypass
OARS FDSFM
Henry St Regulator
Chestnut St Regulator
Spring St Regulator
Long St Regulator
Broad St Regulator
Capital St Regulator
State St Regulator
Town St Regulator
Rich St Regulator
Peters Run Regulator
Whittier St Regulator
Moler St Regulator
20-ft (614 cm)
Tunnel
HRT (250 MGD)
Relief connections
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1. Keep DWF in the OSIS and Flow due to low intensity rainfall 2. Divert WWF from three (3) locations3. Use Tunnel size 20-ft diameter (614 cm)4. Eliminate unnecessary relief connections5. Increase Capture at Chestnut and Henry Regulator6. Eliminate High Rate Treatment7. Real time control at Henry St. regulator.8. Throttle SG from Nationwide Storm sewer (108-in)9. Utilize updated dimensions/elevations for the connections at the Relief
Structures from design layout.10. Improve model stability
Model Parameters Examined to Achieve LOS
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OSIS Performance with OARS Tunnel
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OARS Near Surface
OARS TunnelOSIS
OSISOverflow
OSIS Performance with OARS
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Cost Comparison, 2009 Dollars
Item Near Surface Tunnel
Pump Station N/A $40 M
Near Surface Pipe $260 M N/A
Connections $5 M $30 M
Tunnel and shafts N/A $280 M
Storage $76 M N/A
CSO HRT $125 M N/A
Total $466 M $350 M
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Conclusions
Deep tunnel for CSO in-line storage is the optimum solution.
Hydraulic analysis using the model allowed to size the tunnel for appropriate balance to maximize treatment, maximize storage and optimal controls.
For the same performance, Modeling analysis saved $125 M
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Questions?