Penstock Grouting at Whitehorse Rapids Dam in Whitehorse, Yukon-Video

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Video Summary

Adam describes repairs to two penstocks at Whitehorse Rapids Dam in Yukon, Canada. A 2020 inspection found buckling in the steel pipes, caused by poorly compacted bedding sand and temporary construction supports left beneath the sloping sections. A multidisciplinary investigation—including pipe inspections and geophysical surveys—mapped voids and areas of inadequate support.<br /><br />The team repaired the pipe damage, then tested ultra-fine grout to confirm it could permeate the sand and fill voids at low pressure. They developed and refined a staged grouting plan while treating each penstock. Follow-up geophysical surveys showed substantial improvement in support, especially in Unit 2; Unit 1 also improved, though one small area remained less well supported.<br /><br />Both penstocks returned to service without further reported issues. Adam highlights the importance of thorough investigation, specialist advice, adapting the work plan as conditions become clearer, and using geophysics to assess results when direct inspection is impractical.

Keywords

Whitehorse Rapids Dam

penstock repairs

geophysical surveys

grouting remediation

Yukon Canada