Client: City of Abbotsford.
Location: Abbotsford, British Columbia
Summary: Geotechnical and hydrotechnical engineering for Cannell Lake Dam
Ecora conducted the 2015 Comprehensive Dam Safety Review of the Cannell Lake Dam (and Dickson Lake Dam) for the City of Abbotsford. The dams provide upland sources of potable water to the City of Abbotsford and the District of Mission. The maximum height of the two dams vary from 7.7 m to 8.7 m and are each between 37 m and 77 m long.
Ecora completed all aspects of the Dam Safety Review in accordance with the requirements of the BC Water Sustainability Act Bill 18-2014 (2014), the BC Dam Regulations 40/2016 (2016), the Association of Professional Engineers and Geoscientists of BC (APEGBC) Professional Practice Guidelines – Legislated Dam Safety Reviews in BC v2.0 (2014) and the Canadian Dam Association 2007 Dam Safety Guidelines (2013 Edition).
Ecora conducted a background review, site reconnaissance, failure mode assessment, dam breach analysis and inundation mapping, consequence classification review of the two dams, determined the Inflow Design Flood’s (IDF), carried out a hydraulic assessment of the spillway structures, undertook a landslide generated impulse wave assessment, and undertook a series of geotechnical assessments for potential embankment failure modes, including embankment overtopping, piping through the embankment, piping through the foundation, static and seismic downstream and upstream stability and liquefaction.
The geotechnical assessment also included a seepage analysis to determine the input ground water conditions in the embankments for the stability assessment.