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Wuskwatim’s main dam will be an earth and rock-fill embankment
with a maximum height above foundation level of approximately
14 metres with a 9-metre-wide crest, and an elevation of 236.6
metres above sea level. The dam will have an overall length of
330 metres.
Construction of the main dam, spillway and powerhouse requires
the excavation of approximately 860,000 cubic metres of bedrock
and 1,000,000 cubic metres of common excavation. Some of the bedrock
excavation will be used as rip-rap, large rocks used to prevent
erosion of shorelines and dams, but the majority of the materials
will be disposed of in a permanent earth and rock-filled berm,
which will be constructed between Taskinigup Falls and Wuskwatim
Falls.
A channel will also be excavated immediately north and adjacent
to Wuskwatim Falls through the peninsula. The channel will improve
the outflow conditions from Wuskwatim Lake into the immediate
forebay (reservoir) area, upstream of the powerhouse.
As with the access
road, ceremonies will be held to mark significant milestones and
the inadvertent unearthing of any sacred sites. Environmental
monitoring will also be ongoing.
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