Floodplain Mapping. Vision. Events: 1 in 2 year 1 in 10 year 1 in 20 year 1 in 50 year 1 in 100 year Probable Maximum Flood Climate Change Impacts

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1 Events: 1 in 2 year 1 in 10 year 1 in 20 year 1 in 50 year 1 in 100 year Probable Maximum Flood Climate Change Impacts Floodplain Mapping 28

2 General Approaches to Reducing Flooding Risks Reducing Upstream Flows Increasing Conveyance Capacity Structural Flood Protection Measures Avoiding the Floodplain Reducing Ice Jam Risks Flood Mitigation Options 29

3 Construct Aboiteau in Cobequid Bay to Control Tides from Salmon and Shubenacadie Rivers Aboiteau 1 Construct Aboiteau at HWY 102 Aboiteau 2 Construct Flushing Aboiteau Downstream of River Confluence to Control Tides and Sedimentation Aboiteau 3 Upsize McClures Aboiteau to Double Capacity Additional Infrastructure 1 Upsize McClures Aboiteau and HWY 2 Culverts to Double Capacity of Both Additional Infrastructure 2 Bury Watermain Just Upstream of Bible Hill Bridge Raise Park Street and Add Floodway Culverts In line Horizontal Pumps at Park Street (350 m3/s) and River Confluence (350 m3/s) Additional Infrastructure 3 Additional Infrastructure 4 Additional Infrastructure 5 In line Horizontal Pumps at Park Street (350 m3/s) and River Confluence (350 m3/s) and HWY 102 (600 m3/s) Additional Infrastructure 6 Ice Control and Holding Berms Additional Infrastructure 7 Construct Localised Dykes to Protect Specific Residential Areas Millbrook Flood Mitigation Replace Willow Street and Upstream Culverts and Construct Dykes Additional Infrastructure 8 Additional Infrastructure 9 Dredge Channel to 1 m Below Spring Conditions Dredging 1 Dredge to Standardized Cross Section Dredging 2 Widen River to 400 m Wide Trapezoid From CN on North River and Main Street on Salmon River to HWY 102 Dredging 3 Widen and Straighten River to 400 m Trapezoid From CN on North R. and Main St. on Salmon R. to HWY 102 Dredging 4 Widen Dykes Between Main Street and CN Bridge Dyke Widening 1 Widen Dykes by 5m Upstream of Park Street on Salmon River and Upstream of CN Bridge on the North River Dyke Widening 2 Widen all Dykes by 5 m Dyke Widening 3 Flood Mitigation Options 30

4 Widen Dykes to Larger Floodplain FloodPlain Restoration 1 Widen Dykes to Larger Floodplain, Add Dykes to Reduce Flooding in McClures Brook & Pump FloodPlain Restoration 2 Widen Dykes to Larger Floodplain & Pump Drainage from Behind Dykes FloodPlain Restoration 3 Add Wider Secondary Dyke System to Existing Dyke System (to Maintain Protection of Farmland) FloodPlain Restoration 4 Floodway Bypass Channel 100m Wide to McClures Brook (4.3km) Floodway By pass 1 Floodway Bypass Channel 100m Wide Extended to the WWTP (6km) Floodway By pass 2 Floodway Bypass Extended to Lower Truro (7.75km) Floodway By pass 3 Raise Priority Areas 1 3 to Elevation 13m Priority Area Protection 1 Raise Priority Areas 1 8 to Elevation 13m Priority Area Protection 2 Raise Priority Areas 1 8 (excluding Residential) & Purchase and Remove Residential Properties Priority Area Protection 3 Raise Priority Areas 1 8 (excluding Residential) & Physically Move Residential Buildings Priority Area Protection 4 Raise Priority Areas 1 4 to Elevation 13m Priority Area Protection 5 Raise Priority Areas 1 4 (excluding Residential) & Purchase and Remove Residential Properties Priority Area Protection 6 Raise Priority Areas 1 4 (excluding Residential) & Physically Move Residential Buildings Priority Area Protection 7 Raise all Dykes by 1 m RaiseDykes 1 Raise all Dykes (Varied Height) to Contain all River Flood RaiseDykes 2 Raise all Dykes (Varied Height) to Contain all River Flood & Pump Drainage from Behind Dykes RaiseDykes 3 Reduce flow to CN Bridge on Salmon River and Build Dykes Upstream RaiseDykes 4 Upstream Dams: North River, Salmon River, Farnham Brook and McClures Brook Runoff Reduction 1 Upstream Flow Control Dams on Farnham Brook Runoff Reduction 2 Construct Six Dams in McClures Brook to Reduce Flooding in McClures Brook Runoff Reduction 3 Construct 1 Dam in Millbrook Area Upstream of Willow St Culvert Runoff Reduction 4 Implement BMPs to Reduce Runoff to Pre Development Conditions Runoff Reduction 5 Flood Mitigation Options 31

5 Flood Mitigation Options: more than 40! 32

6 Flood Mitigation Options Floodway Bypass 100m Wide 33

7 Experience Flood Mitigation Options Vital Infrastructure Mapping December 10th

8 Conclusion Questions and Discussion 35

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