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Underground Stormwater Detention and Rainwater Harvesting ... · StormTrap DoubleTrap System •...
Transcript of Underground Stormwater Detention and Rainwater Harvesting ... · StormTrap DoubleTrap System •...
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Underground Stormwater Detention and Rainwater Harvesting System for Northbrook Park District Brett Holmes, P.E., CPSWQ
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• Recognized by Storm Water Solutions Magazine as a Top Project Winner for 2017.
• Won the Illinois Section ASCE Outstanding Civil Engineering Achievement under $10 Million, ACEC-Illinois Engineering Excellence, and Friends of the Chicago River – Green Ribbon.
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• Northbrook stormwater history
• Project overview
• Site constraints and stormwater detention design considerations
• Opportunities to incorporate green infrastructure
• Importance of collaborations, negotiations, and public outreach
• Utilization of technology to maximize project benefits
Topics to be discussed
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Wescott Park Stormwater Management Project
Owner: Village of Northbrook and Northbrook Park District
Engineering Firm: Baxter & Woodman
General Contractor: V3 Companies of Illinois
Location: Wescott Park, located at 1820 Western Avenue, Northbrook, Illinois
Design Features: Stormwater Storage and Rainwater Harvesting
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Village of Northbrook
• Cook County, IL
• Population: 33,170
• 13 Square Miles
• 25 Miles NW of Chicago
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Master Stormwater Management Plan
• Created in response to 1982 and 1987 flood events
• Approved in 19931st Edition
• Included updated costs• Reflected completed projects
1996 and 2002 Updates
• Addendums added in 2012 & 2015• In total, 31 potential projects
included2011 Update
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Wescott Park Stormwater Detention
Wescott Park
Wescott Elementary School
Proposed Detention Location
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Flooding Issues
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Study Phase
Ten homes flood in 25-year storm event
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Conclusions
Proposed Sewer Route
Proposed Detention Location
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Proposed Conditions
25-year flood protection for all homes
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Design and Time Restraints
School and Park District Coordination
• Agreement between Village and Park District
• Defined:
• Construction limits
• Project schedule
• Responsibilities
• Irrigation system to be provided
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Project Funding
• MWRDGC applied for
funding to Cover
Incremental Cost of
Rainwater Harvesting
System
• Intergovernmental
Agreement
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• Began fall of 2014
• Estimated cost: $10.3M
Main Components
• 23 ac-ft underground detention
• 42-inch diameter storm sewer
• High capacity inlets
• Restrictor
• Irrigation system for ballfield
Design Phase
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Design Considerations
•Height and footprint dictated by site constraints
•Minimum HS-20 loading
•8-month construction window
•Expected service life and product warranty
•Cost
Underground Detention Design
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Underground Detention Design
Footprint of Detention
Excavation Limits
Property Boundary
Receiving Sewer
Maximum Construction Limits
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Underground System Comparison
StormTrap DoubleTrap
• Modular, precast concrete system
• 93% efficient storage
Corrugated Metal Pipe
• Storage in circular CMP and void space of backfill
• 86% efficient storage• Durability concerns
Chamber With Reinforced Stone Piers and Walls
• Structurally supported by reinforced stone aggregate
• 64% efficient storage
Cast-in-Place Concrete
• Efficient storage• Requires structural
design• Longer construction time
Plastic/Resin Systems
• Modular• Height limitations
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StormTrap DoubleTrap System
• Modular, precast concrete system
• 2’-2” to 15’-0” in height
• Innovative design which facilitates quick and
efficient installations and minimizes the
detention footprint
• Does not rely on void space storage
• 50-year warranty
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Pre-Construction Rendering
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• Village authorized B&W to move forward with design in August 2015
•Concept:
Use detained water for irrigation
Automatically drain StormTrap in advance of large storms
Rainwater Harvesting System
Storage in StormTrap
Pump from StormTrap
Irrigation
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Requirements for Conditional Approval
• NSF 350 Standards
• Monthly testing for E. coli for one year
• Limited irrigation hours
• Requirements for spigot
Illinois Department of Public Health
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Stormwater Management System
Pre-Treatment Sedimentation
Storage in StormTrap
Pump from StormTrap
UV Sanitization System
Irrigation
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Storage Configuration – Option 1
Full footprint of StormTrap
Control Gate/Valve
Pros• No StormTrap modifications• Drains by gravity
Cons• Watertight seal required over large area• Gate/valve required
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Partition
Control Gate/Valve
Pros• Reduced footprint of watertight seal• Drains by gravity
Cons• Gate/valve required• Tailwater impacts
Storage Configuration – Option 2
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Sump Area
Pros• Least expensive option• Additional volume provided• Failure condition not critical
Cons• Does not drain by gravity
Storage Configuration – Option 3
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• StormTrap DoubleTrap divided into two sub sections
• 11’- 4’’ height in sump area, 10’- 0’’ in remainder of structure
• Modular units placed on stone foundation
• Number of pieces: 1,722
• Total water stored: 23.7 acre feet
System Design and Functionality
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System Design and Functionality
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System Design and Functionality
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System Design and Functionality
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System Design and Functionality – Roof Inflow
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System Design and Functionality – Watertight Seal
• System sealant type - joint
• Joints are sealed with Xypex
Patch’n Plug hydraulic cement
compound
• Sealed joints were tested
following construction
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• Additional pre-filtration
• UV radiation kills bacteria and pathogens
• Minimal contact time required
• Non-chemical
• No odor
UV Sanitization System
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• Automated control system
• Utilizes online weather forecast data
• Pumps stored water to the downstream sewer system in advance of large storms
• Onsite touch screen controls
• Web interface to monitor system remotely
System Controls and Automation
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Construction Progress
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Construction Progress
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Construction Progress
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Construction Progress
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Construction Progress
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Construction Progress
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Construction Progress
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Wescott Park Time-Lapse