battery park city ballfields & community center resilience project ... · 25-07-2019 ·...
TRANSCRIPT
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Battery Park CityBallfields &
Community Center Resilience Project
BPCA MeetingJuly 25, 2019
1
Flood Resilience Selection
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Agenda
• Site Review
• Permanent Solution: Reinforced Concrete Wall (DFE 14.5’)
• Interim Solution: Steel Plate Wall (DFE 11’)
• Guiding Objectives Review
• Next Steps
2
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Topography
3
+13.7’
+8.5’
+8.3’
+7.0’
+6.8’
+8.0’
+7.5’
+11.0’
+14.3’
+15.8’
+16.4’
+15.9’
+17.1’
+16.6’
+11.0’
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Guiding Objectives
• Flood risk
• Integration with landscape and built environment
• Minimize loss of field use and duration of construction
• Cost
• Schedule
4
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Permanent Solution: Reinforced Concrete Wall (DFE 14.5’)
5
• Reinforced Concrete Wall to DFE 14.5’ (NAVD88)
• Hybrid Alignment of Wall (Interior and Exterior)
• 6 Deployable Flood Barriers, 8 ConEd Grates
• Level of Protection DFE 14.5’ = BFE 11’ + 2.5’ SLR + 1’ Freeboard
Wall at lowest grade = 7.7’
Full seepage cutoff
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Permanent Solution: Reinforced Concrete Wall Warren Street
6
Save and Protect Existing Fence
Align Top of Fence with Bottom of Horizontal Rail
Walkway
Existing Fence Footing Beyond
Flood Wall with Interior Alignment
Existing Granite Wall
New Piles and Flood Wall Foundation
3” Safety PadsDFE 14.5
KEY PLAN
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Permanent Solution: Reinforced Concrete Wall Alignment
7
Moveable Flood
Protection Device
Permanent Wall with
Architectural Treatment
Architectural Treatment
without Flood Barrier
Fence
Permanent Store In-Place
Vehicular Flood Gate
Permanent Wall
Existing Fence
MAINTAINING EGRESS
AND EMERGENCY
ACCESS TO BUILDINGS
DURING STORM
EVENTS AT LOADING
BAY ON MURRAY ST.
PROTECT AND SEAL MEP.
ELECTRICAL AND
CONDUITS INTO BUILDING
OR UTILITY VAULTS TO
MAINTAIN FLOOD WALL
ALIGNMENT
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Permanent Solution: Reinforced Concrete Wall Warren Street
8Looking Northeast along Warren St.
PROPOSED WALL
THICKNESS (18”-
24”)
EXISTING WALL
THICKNESS (+/- 18”)
El. +/-9.5’
DFE
El.
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Potential Materials for Reinforced Concrete Wall
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Interim Solution: Steel Plate Wall (DFE 11’)
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• Reuse Existing Fence Foundations
• ¾-inch Thick Steel Plate
• Alignment Exterior to Fence
• 3 Moveable Flood Protection Device, 6 Community Center Flood-Rated Doors + Flood-Rated Glass
• Level of Protection DFE 11’ = BFE 11’ (no SLR, no Freeboard) Max wall height 4’ due to structural capacity Limited seepage protection
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Interim Solution: Steel Plate Wall
11
Steel Plate Wall
Store In-Place Vehicular Flood Gate
Existing Fence
Moveable Flood Protection DeviceWall with Architectural TreatmentArchitectural Treatment without Flood BarrierFence
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Interim Solution: Steel Plate WallWarren Street
12
Save and Protect Existing Fence
Align Top of Fence with Bottom of Horizontal Rail
Walkway
Existing Fence Footing
Proposed Grade Beam
Existing Granite Wall
11.0
KEY PLAN
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Community Center Hardening
13
Protect the Community Center with Flood-Rated Glass and Flood Doors
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Potential Materials for Interim Solution
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Interim Solution: Steel Plate WallMurray Street
15
4’ tall steel plate wall is “stepped-down” to match slope in grade surface
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Interim Solution: Steel Plate WallWarren Street
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Interim Solution: Steel Plate WallCorner of West St. and Murray St.
17
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Guiding Objectives
18
Permanent Solution(DFE 14.5’)
Interim Solution(DFE 11’)
4% chance of exceedance in 10 years
10% chance of exceedance in 10 years
• Flood risk
• Integration with landscape and built environment
• Minimize loss of field use and duration of construction
• Cost
• Schedule
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Foundation Comparison
19Steel Plate Wall Reinforced Concrete Wall
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Guiding Objectives
20
Permanent Solution(DFE 14.5’)
Interim Solution(DFE 11’)
• 8-foot max wall height
• More finish options• Permanent wall
• 4-foot max wall height
• Fewer finish options• Removable wall
• Flood risk
• Integration with landscape and built environment
• Minimize loss of field use and duration of construction
• Cost
• Schedule
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Integration with Landscape
21
8-foot max wall height
4-foot max wall height
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Guiding Objectives
22
Permanent Solution(DFE 14.5’)
Interim Solution(DFE 11’)
30’ field width for pile operation total duration
approx. 15 months
6’ field width for grade beam operation total
duration approx. 6 months
• Flood risk
• Integration with landscape and built environment
• Minimize loss of field use and duration of construction
• Cost
• Schedule
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Minimize Construction
23
Reinforced Concrete Wall
Steel Plate Wall
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Guiding Objectives
24
Permanent Solution(DFE 14.5’)
Interim Solution(DFE 11’)
Est. $9.5-10.5M Est. $4-5M
• Flood risk
• Integration with landscape and built environment
• Minimize loss of field use and duration of construction
• Cost
• Schedule
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Guiding Objectives
25
Permanent Solution(DFE 14.5’)
Interim Solution(DFE 11’)
End Date: Q2 2021
End Date: Q2 2020
• Flood risk
• Integration with landscape and built environment
• Minimize loss of field use and duration of construction
• Cost
• Schedule
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Schedule
26
Steel Plate WallReinforced
Concrete Wall
Construction
Bidding and Permitting
04
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Guiding Objectives - Summary
27
Permanent Solution(DFE 14.5’)
Interim Solution(DFE 11’)
Est. $9.5-10.5M Est. $4-5M
• Flood risk
• Integration with landscape and built environment
• Minimize loss of field use and duration of construction
• Cost
• Schedule
30’ field width for pile operation total duration
approx. 15 months
6’ field width for grade beam operation total
duration approx. 6 months
4% chance of exceedance in 10 years
10% chance of exceedance in 10 years
End Date: Q2 2021
End Date: Q2 2020
• 8-foot max wall height
• More finish options• Permanent Wall
• 4-foot max wall height
• Fewer Finish Options• Removable wall
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Next Steps
• Decision between Interim Solution and Permanent Solution
• Alignment Decision (only permanent solution)
• Pre-Application Agency Meetings
• 30% Design Development
• Continued Community Input
• Next Public Meeting (Approximately September 2019)
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Discussion
Deliver a world-class public realm design for Wagner Park – beloved by the community –
that protects from future storms
Questions and Comments
29