Dollarton Highway Realignment Project
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Transcript of Dollarton Highway Realignment Project
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Dollarton Highway Dollarton Highway Realignment ProjectRealignment Project
District of North VancouverDistrict of North Vancouver
May 12, 2006
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Project Area
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Maplewood MudflatsMaplewood Mudflats
Maplewood Mud Flats
Conservation Area
New Dollarton ROW
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Environmentally Sensitive AreaEnvironmentally Sensitive Area
Protect a rare & vital Burrard Inlet ecosystem
Groundwater dependencies.
Water Quality.
Maplewood Mudflats Conservation Area.
Wildlife habitat & migration corridors.
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Scope of the ProjectScope of the Project
New Roads Constructed.
Dollarton Highway Realignment – 1.1 km major arterial, 4 lane divided
Riverside Drive East – 0.3 km major collector, 4 lane undivided.
Other roads – 0.9 km local commercial/industrial, 2 lane undivided.
Carried out in 5 phases starting in 1999 and completed in 2003
Total cost of project approx $8 Million
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Project Catchment Area – 40.6 Ha.Project Catchment Area – 40.6 Ha.
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Technical RequirementsTechnical Requirements
Drainage Design
Must service the entire drainage area.
Safe disposal of storm water.
Groundwater recharge
Minimize post-development flow impacts.
Provide overflows to storm sewer for large storms
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Storm Sewer SystemStorm Sewer System
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Existing Site ConditionsExisting Site Conditions
Native soils - well graded sandy gravel / gravelly sand
High water table (anywhere from 1.0m to 5m below surface
Measured hydraulic conductivity 1x10-3 to 4x10-3 m/s (medium permeability)
Flat terrain – road grades from 0.5% to 3.7%
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Design ConsiderationsDesign Considerations
Used dispersal drains for 49 of the 69 catch basins installed.
Incorporate groundwater recharge into the design .
Use gasketed joints for storm sewers to avoid groundwater table draw down.
Include trench dams to prevent groundwater from following trench lines to the outfall.
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Typical Road Cross SectionTypical Road Cross Section
Infiltrating CB system
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Catch Basin Dispersal DrainsCatch Basin Dispersal Drains
Infiltrating CB system
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Dispersal Drain Plan ViewDispersal Drain Plan View
Dispersal Drain Detail
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Dispersal Drain SectionDispersal Drain Section
Dispersal Drain Detail
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Marine OutfallMarine Outfall
Adapted O&G Chamber design based on previous research & experience.
Design low flow bypass in sewer main to divert water into chamber when most needed.
Better treatment (TSS removal) and less frequent maintenance, virtually no re-suspension of entrained sediment.
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Marine OutfallMarine Outfall
Oil & Grit Interceptor
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Marine OutfallMarine Outfall
Riparian planting plan for rip rap slope between elevations 2.5 and the top of the slope
Ecopockets planted @ 1 plant per 1.5 m2 or as directed by the environmental monitor
Riparian planting stock
•Red osier dogwood
•Black Hawthorn
•Pacific WIllow
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Low flow diversion weir
Oil & Grit Interceptor
Treated water outfall
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Dollarton Highway west of Dollarton Highway west of Riverside DriveRiverside Drive
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Dollarton Highway east of Riverside Dollarton Highway east of Riverside DriveDrive
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What Have We learnedWhat Have We learned