basin / inlet restrictor installation, fog and dye testing for cross-connections and sewer deficiencies, closed circuit camera work and data analysis.
A report regarding the establishment of a dedicated inflow and infiltration funding program to address inflow and infiltration measures will be brought before Council in early 2021.
Sewer and Coastal Flood Protection Master Plan
The total estimated cost of the recommended solutions identified in the Sewer and Coastal Flood Protection Master Plan is $4.9 billion. The recommended solutions are not intended to be completed overnight but rather to be undertaken over many years. The recommendations provide a roadmap to follow over the next 50 years or more.
There are no major capital projects in the immediate vicinity of the area in Ward 1 that had the highest concentration of reported flooding from the August 28, 2020 event. That area is identified as being currently at risk under the 1:25 year storm (65mm).
However, flood Reduction Solutions contained in the Sewer and Coastal Flood Protection Master Plan are addressed by three strategies: 1) Source control, 2) Increased conveyance and storage capacity and 3) Increased downstream capacity. Elements of the Sewer Master Plan that, once in place, will reduce future instances of basement flooding within this area include:
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Source control – reducing the amount of stormwater getting into the sanitary sewer system:
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Mandatory foundation drain disconnections for homes built before 1980
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Mandatory downspout disconnection
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Sanitary rain catchers (south of Dougall Parkway and east of Howard Ave) (immediate) and maintenance hole sealing (ongoing program)
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Increased conveyance and storage capacity:
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Sub-trunk sanitary sewer storage on Dominion and Woodland, from West Grand to Roselawn Dr (medium priority; 20-29 years)
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Increase storage volume in Southwood Lakes (medium priority)
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Increased downstream capacity:
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Construction of RTB at LRWRP (immediate priority – timing to be determined pending funding)
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With respect to increasing storage volume in Southwood Lakes, one immediate step that can be taken to increase capacity in the short-term is adjusting the pumping station operational elevation in Lake Como. The Southwood Lakes area is identified by the modelling as an area where the depth of surface flooding on the road exceeds the target level of service (max. 300mm depth of surface flooding for 100-year storm, or on critical collector/arterial routes under the climate change storm). Adjusting the pumping station operational float in Lake Como will create additional storage meaning that additional capacity for stormwater in the pond instead of on the roads will be created. Decreasing the depth of stormwater storage on the roads will make them passable. The estimated cost for this is $35,000.