THUNDER BAY AREA...Thunder Bay Outlet • Possible outlet on Thunder Bay Road. • Will drain area...
Transcript of THUNDER BAY AREA...Thunder Bay Outlet • Possible outlet on Thunder Bay Road. • Will drain area...
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THUNDER BAY AREATHUNDER BAY AREADRAINAGE MASTER PLANDRAINAGE MASTER PLAN
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Overall problem Vs. local solutions
• There are several areas with local flooding problems
• A review of the situation showed that the problem is not local, but that the existing outlets are insufficient to carry the storm water load
• The present goal is to determine a solution which will reduce the storm water load in the ditches and carry the water to an outlet as efficiently as possible.
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Existing Condition• For a 5 year storm event• Almost all water is carried through
surface ditching• Some rain water goes to the
friendship trail• Some rain runs east on Thunder Bay
road to Six-Mile creek• Most rain goes out the Shirley road
outlet
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Image of existing drainage pattern
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Existing Condition
• Most rain travels through surface ditching• Effectiveness of the system is limited by
water level and storage capacity of the outlets
• The system’s ability to drain is significantly impacted by the wind direction over the lake and the water level in Six-Mile Creek
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Problems with existing condition
• Friendship trail ditch running at capacity
• Thunder Bay ditches overflowing• Shirley outlet at capacity
– Provincially significant wetland– Species at risk– Areas which run over private property– Limits any significant maintenance
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Images of Shirley Outlet
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Proposed Master Plan
• Redistribute the drainage basins• Improve 3 existing outlets
– Friendship Trail – Burleigh – Thunder bay or Bernard
• Significantly reduce the flow going through the Shirley outlet
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Friendship Trail
• New ditch on south side of trail (twinning the ditch)
• From Bernard to Six-Mile Creek• Double the storage capacity of the
outlet during heavy rain events • Significantly improve the drainage
for the Jewell & Hyman area• Approx cost $200 000
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Image of proposed Friendship trail ditch outlet
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Burleigh Road Outlet
• Will drain Burleigh Road and areas to the west
• Improve outlet into lake Erie at south end of Burleigh Road
• Outlet with a 1.8m x 1.2m (4 foot by 6 foot) box structure
• Approx cost $1.3 million
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Image of proposed Burleigh Road outlet
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Thunder Bay Outlet
• Possible outlet on Thunder Bay Road.• Will drain area south of Riselay, between
Burleigh & Bernard• Outlet at Thunder Bay Road into Six-Mile
Creek• Outlet structure will be twin 1.2m (4 foot)
diameter pipes• Approximate cost $4.0 Million
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Image of proposed Thunder Bay Road outlet
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Bernard Street Outlet
• Possible outlet on Bernard avenue into lake Erie
• Will drain area south of Riselay, between Burleigh & Bernard
• Outlet will be a 1.8m x 1.2m (4 foot by 6 foot) box structure
• Approximate cost $2.0 million
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Image of proposed Bernard Avenue outlet
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Image of proposed Bernard Avenue outlet
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Image of proposed Bernard Avenue outlet
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Image of proposed Bernard Avenue outlet
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Design Considerations
• Streets will retain their ditches.• Ditches will be re-sloped to run
towards the appropriate pipe inlet.• Risk of ditch overflow should be
reduced or eliminated.
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Design Considerations
• Attempted design with ditches only – IE: no pipes
• Ditch only design with outflows as proposed (Burleigh, Trail, Bernard, Thunder Bay, Shirley) would have ditches up to 1.8m deep (6 feet)
• Significant negative impact on these roads (deep ditches, tree removals, utility relocations)
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Proposed 1.8m deep ditches
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Proposed 1.8m deep ditches
•PICTURE
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Bernard Vs Thunder Bay• Bernard and thunder Bay outlets should be seen as
alternatives to each other• Thunder Bay
– will cost approx $4.0 Million– Will outlet to Six Mile creek. – Note that during heavy storm events that the creek
backs-up which could back-up the system• Bernard Street
– Will cost approx $2.0 Million– Will outlet over beach (above high water mark)– Town must continue and improve its regular
maintenance over beach area. Especially after any storm event
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Image of proposed overall drainage pattern
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Expected cost
• Project including Bernard Outlet will cost approx $3.5 Million
• Project including Thunder Bay Ave outlet will cost approx $5.5 Million
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Schedule
• Phase 1 (2007)– Bernard outlet to Thunder Bay Road– Twinning of Friendship trail ditch
• Phase 2– Piping on Thunder Bay and Cook– Local ditch improvements
• Phase 3– Burleigh outlet – Piping on Burleigh & Pleasant– Local ditch improvements
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Questions