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Preliminary Design Alternatives

There are six major preliminary design alternatives that were considered for this project. After careful consideration, design alternative one is the preferred alternative, although at this stage of the project other alternatives may still be chosen for the final design.

One: Construct a bypass around the south end of the dam (preferred alternative)

Dig a penstock channel around the south end of the dam and place the generating equipment in the channel. Walls or abutments may be constructed to guide, funnel and maximize the water flow into the channel. The top of these walls may be just below the normal surface level of the water for esthetic reasons. The top of the flat concrete roof over the penstock channel will be approximately level with the tops of the existing sluices, and a walkway across the roof will give continued public access to the sluiceway tops. There may be a small building (about 3 meters square) on the adjacent shore to house control equipment. This is the preferred alternative.

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Drawing of Design Alternative One


Two: Turbines submerged in front of the existing sluice gates

Up to four turbines would be submerged in the current upriver directly in front of the sluice gates. Walls or abutments may be constructed to guide, funnel and maximize the current flow through the turbines. The top of these walls may be just below the normal surface level of the water for esthetic reasons.

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Three: Turbines installed in one or both existing sluice gates

Install from one to four turbines in one or both of the sluice gates. Walls or abutments may be constructed to guide, funnel and maximize the current flow over the turbines. The top of these walls may be just below the normal surface level of the water for esthetic reasons.

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Four: Turbines installed in both existing sluice gates with an overflow gate added

If design three doesn't meet Parks Canada's requirement for 120% bypass, a third sluice gate can be built in the weir between the existing sluice gates and the small abutment. With the resulting three sluice gates, two can be used for the generating equipment and one can be used for bypass.

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Five: All turbines installed in a new sluice gate

Build a third sluice gate in the weir between the existing sluice gates and the small abutment. All of the generating equipment would be located in that gate and the existing two sluice gates would be left alone. Walls or abutments may be constructed to guide, funnel and maximize the current flow through the turbines. The top of these walls may be just below the normal surface level of the water for esthetic reasons. A 'splash wall' may be required on the shore of the island directly opposite the gate to prevent erosion.

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Six: Construct a bypass around the north end of the dam

Dig a penstock channel around the north end of the dam and place the generating equipment in the channel. Walls or abutments may be constructed to guide, funnel and maximize the water flow into the channel. The top of these walls may be just below the normal surface level of the water for esthetic reasons.

Advantages

Disadvantages

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