Chris Denich, M.Sc., P.Eng Aquafor Beech Ltd TRIECA _ March 26-27 th - - PowerPoint PPT Presentation

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Chris Denich, M.Sc., P.Eng Aquafor Beech Ltd TRIECA _ March 26-27 th - - PowerPoint PPT Presentation

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Chris Denich, M.Sc., P.Eng Aquafor Beech Ltd TRIECA _ March 26-27 th , 2013 New Development ROW Upper Middle Road Retrofits Public Realm Green Glades Public Realm Beach Boulevard Park Retrofit ROW Retrofit

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Chris Denich, M.Sc., P.Eng Aquafor Beech Ltd

TRIECA _ March 26-27th, 2013

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 New Development  ROW– Upper Middle Road  Retrofits  Public Realm– Green Glades  Public Realm– Beach Boulevard Park Retrofit  ROW Retrofit – Lakeview

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 Bioretention Unit  New Development  Oakville, Ontario  Constructed in

2011

 Facility- 1,600m2  Accepts 4ha road

drainage

 25mm event

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  • Designed and constructed to address stormwater impacts

to the habitat of Red-Side Dace, a fish species provincially designated as At Risk and protected under the Species at Risk Act (SARA).

  • General reluctance to approve conventional SWM

approaches: Wet ponds, wetlands and OGS for water quality

  • Facility that can be characterized/become habitat are

discouraged

  • Thermal impacts are now a concern
  • Disruption of baseflow, etc
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 Hydrogeological Study of Groundwater - Surface

Water Interaction (Aquafor, 2009)

 Previous Geotechnical reports – 05 & 07 Soil Stratigraphy

>8m of unsorted Sand & Gravel, overlain and confined within the valley slopes by 5‐10m of silty clay (Halton Till)

Hydraulic Conductivity

Silty Clay till –low conductivity (10‐7 to 10‐10 m/s) Sand & Gravel unit – high conductivity (10‐5 to 10‐6 m/s)

  • 2‐3 orders of magnitude difference
  • Using a sensitivity analysis, 15 mm/hr was determined using

hand‐driven piezometers & sharp response to rainfall events and rapid drainage as baseflow

Seasonally High Groundwater Table Elevation

±122.5m

Groundwater Table Fluctuation

0.2‐0.5m

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Bioretention Design

Plunge Pool Grass Filter Strip OGS Pre-Treatment

  • 1. OGS (Stormceptor STC 14000)
  • 2. Plunge Pool - 150m2
  • 3. Grass Filter Strip – 2.5m

Bioretention Facility Underdrain System Overflow Channel

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Bioretention Facility Design

Native Sand & Gravel D-Washed 50mm ø Underdrains Media Shredded HW-Mulch Observation Well

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 Can be characterized by

the rain event type: Sm Small Ev Event

  • Frequent/ ‘typical events’ –

representing the majority of the annual rainfall events, typically characterized by low intensity, long duration.

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 Can be characterized by

the rain event type: La Larg rge E Events

  • Infrequent/ Large Events -

these types of events occur infrequently but are characterized by high intensity and short duration.

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Bioretention Media is the functional component of the system – critical to the long-term function of the system

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7.83 18 7.6 6.26 17.7 7.6 5.60 18.3 7.6 0.00 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 % Fines CEC (meq/100g) pH Prototype 1 Prototype 2 Prototype 3

Hand Mixed Prototypes

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Mechanically Mixed Prototypes – Mass Production

7.83 18 7.6 7.7 15.6 7.5 0.00 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 % Fines CEC (meq/100g) pH Prototype 1 (Hand Mixed) Prototype 1 (Mechanically Mixed)

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For Construction – Large Site

23.4 16.3 7.20 4.9 12.8 7.37 6.2 12.9 7.31 6.3 15.2 7.38 0.0 5.0 10.0 15.0 20.0 25.0 % Fines CEC (meq/100g) pH July 18, 2011 July 19, 2011 July 25, 2011 July 26, 2011

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Infiltration Testing During Construction: 50-75mm/hr

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Washed Un-washed

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April 2012

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June 2012

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 Bioretention Unit

Retrofit

 Mississauga, ON  Constructed in

2011

 Facility- 11m2  Accepts 0.03ha

road & roof drainage

 25mm event

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Drainage Area Retrofit Area

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 Pilot Project - Retrofit  Accept runoff from the small flat roof above

the building’s front entrance as well as a portion of the parking lot area

 Existing Issues

  • Iced sidewalk - Flat roof drainage flowed over

sidewalk area

  • Settlement of asphalt area at pedestrian cross-walk

created nuisance ponding and icy conditions

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 Guelph Permeameter – In-situ infiltration testing  Sub-surface soils investigation – hand auger Soil Stratigraphy 10‐15cm of topsoil 0.8‐1.0m of Silty, Fine sand (approx 10% silt) >2m of Fine sand Hydraulic Conductivity At 1.5m depth below surface‐ hydraulic conductivity

  • f native soils = 2.03x10‐3 cm/s or 73mm/hr

Groundwater Table Elevation No water table encountered at depths greater than 2.5m throughout testing (June –August)

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Bioretention Facility Dry River Bed Inlet Grate Outlet Grate Existing Electrical Trench

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Existing Electrical Trench

Prelim liminary D Design Revised sed D Desi sign

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For Construction – Small Site

7.7 15.6 7.5 25.9 15.2 7.5 13.4 14.8 7.6 0.0 5.0 10.0 15.0 20.0 25.0 30.0 % Fines CEC (meq/100g) pH Approved Media Mix (Mechanically Mixed) Refuted Sample (High) Refuted Sample (Low)

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Be Before re

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Af After

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 ROW Retrofit within older

residential area

  • Bioswales & Perforated

Pipe System

  • Permeable pavement
  • Bioretention media for

filtration and infiltration

 Mississauga, ON  Construction – Spring

2012

 Accepts road & property

drainage

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0.0 2.0 4.0 6.0 8.0 10.0 Alt Alternative R Rating Alt Alternatives

Public R ic Resp sponse ses t s to Presente ted A Alte ternatives

Support for

  • Environ. Project

Grassed Swale Vegetated Swale Ditch Improvements

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(Most Important to least important) 1) Parking 2) Water Quality 3) Environmental Benefits 4) Prevent Flooding 5) Integration with the Environment 6) Improve Conveyance 7) Integration with Existing Infrastructure 8) Aesthetics Other results

  • No Sidewalks
  • Cost not important
  • Same Driveway width after

construction

  • 50% want perennial plants
  • Willing to do maintenance
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Third St.

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7. 7.2m 2m w widths pro provides a access bu but is le is less t ss than cur current Ci City S Standard (8 (8.0m) Select cted t to r reduce ce im impervio ious co cover an and al allow f for addi dditional a area f for r bi bioswales

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 Geotechnical investigation undertaken within

the existing ROW/ditches

Soil Stratigraphy 5‐30cm of topsoil 0.2‐1.5m of Clayey Silty Fill with some sand & gravel Clayey Silt Till deposits at depth Hydraulic Conductivity At 1.0‐1.2m depth below surface‐ design infiltration rate was determined to be 5.45mm/hr (2.5 SF) – 5mm/hr used in the design Groundwater Table Elevation Observations included generally no GW (GW observed at surface in some locations ‐ attributed to water perched in the ditches and fill stratum)

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Water Service Line Punctured Bell Line Damaged (BellService Onsite)

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 To avo

avoid an an ex existing gas gas lin line, a a section o

  • f

perforated und underdrain was no notched t to a allow th the g e gas l line to to tra transect th the pi e pipe

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Materials not identified in the geotechnical reports!

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 Re-grading of properties;  Infil-development (3 homes);  Abandoned and/or unmarked utilities;  Sump-pump and property drainage

connections;

 No trees;

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Sacrificial Geotextile

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Inlet ESC Controls

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 Soakaway Pit  Park Redevelopment of

vacant land

 Hamilton, ON  Constructed 2011  Accepts parking lot

drainage for up to 100 year storm (full infiltration)

 Combined and separated

storm sewers – City desire to minimize flows resulting from infill developments

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Groundwater – Seasonally High Infiltration Testing Sands and Gravel

Seasonally high (March- April) groundwater elevation of 1.28m below the ground surface at an elevation of approximately 75.0m was determined

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Groundwater – Seasonally High = Major Design Concern due to site location

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