Minimal maintenance requirements Smallest land and lakebed footprint

No added ecological or recreational benefits Slightly less effective erosion control compared to other concepts Creates a vertical barrier between land and lake

Naturalized shoreline provides ecological benefits

Requires permanent relocation of Centreville train tracks

Naturalized shoreline provides ecological benefits Berm could be designed with walkway for added recreational value Significantly lower cost solution compared to other alternatives

Slightly less flood protection than other concepts as berm does not prevent seepage Requires permanent relocation of Centreville train tracks and may require relocation of some structures close to the shoreline

Centreville Existing Conditions

Centreville is located on the east side of Centre Island. Its shoreline is currently surrounded by several different types of structures, most of which are in deteriorating condition and do not provide adequate flood protection.

Existing shoreline conditions at Centreville. Source: Baird, 2022.

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Centreville Concept Designs

The following concept designs are being presented:

Centreville Summary Video

Concept 1
Steel Sheet Pile Wall

Concept 1 involves installing a steel sheet pile wall around the perimeter of the Centreville focus area. The side of the wall facing the park could be covered with another material such as brick to improve appearance.

Map of Centre Island Centreville showing a steel sheet pile wall revetment treatment.

Centreville - Concept 1: Steel Sheet Pile Wall. Source: Baird, 2022.

Cross-section of a sheet pile wall installed along an otherwise unaltered shoreline.

Centreville - Concept 1 Cross-section B. Source: Baird, 2022.

Advantages

Minimal maintenance requirements
Smallest land and lakebed footprint

Disadvantages

No added ecological or recreational benefits
Slightly less effective erosion control compared to other concepts
Creates a vertical barrier between land and lake

OVERALL EVALUATION RANKING: LOW

Concept 2
Naturalized Shoreline and Flood Berm

Concept 2 involves installing an impermeable berm around the perimeter of the Centreville focus area. In front of the berm, the shoreline would be naturalized with a mix of stone and vegetation to soften the shoreline and provide aquatic habitat.

Map of Centreville showing a naturalized shoreline and flood berm treatment.

Centreville - Concept 2: Naturalized Shoreline and Flood Berm. Source: Baird, 2022.

Cross-section showing naturalized shoreline with a backshore berm, and removal of the existing wall.

Centreville - Concept 2, Cross-section C. Source: Baird, 2022.

Centreville - Concept 2, Cross-section D. Source: Baird, 2022.

Advantages

Naturalized shoreline provides ecological benefits
Berm could be designed with walkway for added recreational value
Significantly lower cost solution compared to other alternatives

Disadvantages

Slightly less flood protection than other concepts as berm does not prevent seepage
Requires permanent relocation of Centreville train tracks and may require relocation of some structures close to the shoreline

OVERALL EVALUATION RANKING: HIGH

Concept 3
Buried Steel Sheet Pile Wall and Naturalized Shoreline

Concept 3 is a combination of the first two options. This concept involves installing a steel sheet pile wall around the perimeter of the focus area. The wall would then be buried by raising the land behind it. A naturalized shoreline would be created along the side of the wall facing the water.