BC Hydro says it could cost as much as C$70 million (US$66 million) to mitigate piping and seismic risks at 67.5-MW Strathcona Dam. The earthfill dam was constructed in British Columbia in the 1950s. BC Hydro previously acknowledged the dam did not meet modern-day standards. The utility said internal erosion within the dam core could occur. Over time, erosion could result in sinkholes or subsidence of the crest and lead to dam overtopping, it said.
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