© 2014 hdr architecture, inc., all rights reserved.© 2016...
TRANSCRIPT
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© 2014 HDR Architecture, Inc., all rights reserved.© 2014 HDR Architecture, Inc., all rights reserved.© 2014 HDR Architecture, Inc., all rights reserved.© 2014 HDR, Inc., all rights reserved.© 2014 HDR, Inc., all rights reserved.© 2014 HDR, Inc., all rights reserved.© 2016 HDR, Inc., all rights reserved.
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© 2016 HDR, Inc., all rights reserved.
More Than a Hole in the Ground: Makingthe Most out of Stormwater Management
2017 APWA Stormwater ManagementConference
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01 Background and Process
02 Design and Integration
03 The Vision
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01 Background andProcess
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§ Calgary Factso Same size as NYC but just 10% the populationo 2,300 hours of sunshine a yearo Weird fact – Given a gun and horse when
leave jail
§ Project Playerso Owner & Client – Truman Developmento Planner – CivicWorkso Engineer – HDR & UrbanSystemso Municipality – City of Calgary
West District Project
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§ 1st Idea – Total Infiltrationo City concerned with groundwater
contamination§ 2nd Idea – Pond with Open
Spaceo Developer instructed planner to
develop comingled open spacewith pond• All developments are required 10%
of open spaceo Planner found 4th Ward park,
reached out to HDR
Conceptual Stage
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historic fourth ward park | atlanta
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High-level collaboration between City and Developer prior to design phaseCalgary Development Process
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Development Progression
§ Ongoing discussion about park ownershipand maintenance
§ Ensures early investment by developerdoes not go to waste.
§ Formalized submittalso Master Drainage Plan (MDP)o Staged Master Drainage Plan (SMDP)o Pond Report
§ “Final Design” during conceptual stage
Conceptual Design
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02 Design and Integration
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§ 500 Year Rainfall Event, 24 Hour Durationo 111.3 millimeterso 4.38 inches
§ Chicago Distribution§ Design for 100-year storm, potentially 500-
year storm
Rainfall
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§ Dry Ponds, Wet Ponds & Wetlands§ Planned for prior to developmento Preliminarily Sized by City
§ Focus of algae prevention§ Water Quality improvements inherent to
design, provide 85% TSS removal
Stormwater Control
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§ Wet Pondo 2.5 L/s/ha allowable unit area release rate (UARR)o Store volume discharging no higher than the UARRo 2-3 meter deep permanent poolo 1 meter minimum active storage deptho 0.3 meter freeboard (~1 foot)
§ Design Stormo 100-year design storm with emergency overflow, 500-
year with no overflowo Continuous modeling, statistical evaluation to
determine 100-year storage from 55-years of datao Most conservative volume of runoff is to be design
volume.
Wet Pond Design Criteria
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§ Single Event Analysis – EPASWMMo Green-Ampt Method requestedo Design storms from City of Calgary Stormwater
Manual§ Continuous Modeling – PCSWMMo Green-Ampt Method requestedo 55-years of rainfall datao Daily Temperature Data
§ Statistical Evaluation - HYFRAN
Modeling Approach
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Site Specific Hydrologic Results
§ 32.8 hectares – 81.0 acres§ 82 L/s release rate – 2.89 cfs§ 100-year Design Storm – 21,233 Cubic Meters – 17.2 ac-ft§ 100-year Statistical Evaluation – 22,400 Cubic Meters – 18.2 ac-ft§ Continuous Modeling Maximum Volume – 24,670 Cubic Meters – 20.0 ac-ft§ 500-year Design Storm Volume – 27,890 Cubic Meters – Total Volume of Pond Storage 22.6 ac-ft
Wet Pond Design
Uncontrolled Peak Flow Maximum Allowable Outflow148 cfs 2.89 cfs
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§ Amphitheatre§ Splash Pad§ Lower Plaza Fountain/Skating Rink§ Restaurant§ Playgrounds§ Orchard§ Community Garden§ Lawn Space§ Preserve Native Aspen Stands
Public Outreach
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03 The Vision
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Wet Pond and Stormwater Park§ Approach for protecting park functionality
1. Utilized continuous modeling to determinehistorical frequencies of park inundation
2. Designed elevation of features to the 24-hourdesign storm for safety
§ Developer and City created unique goals forthe park functionality.o Perimeter Walkway – 2 Yearo Amphitheatre – 10-yearo Lower Plaza – 50-yearo 500-year does not impact adjacent building
foundations
Park, Meet Pond
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west district central park | calgary
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§ Utilizing subsurface infiltration toapproximately double pond discharge, inorder to meet level of service requirementsfor the park.
§ Gravelly soils, providing 2.77 m3/day/m2
infiltration rate§ 0.176 cm/s infiltration outflow (6.25 cfs)
Infiltration
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§ End-of-pipe treatment - Primary§ Littoral Shelf - Secondary§ Boardwalk Wetlands - Secondary
Water Quality
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§ City reviewing design§ Infiltration gallery design§ Water quality analysis§ Maintenance plan§ Final model
Status and Next Steps
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Questions?Contact Information:[email protected]@hdrinc.com