Channel Instability Problems at Two Pipeline River Crossings in Alberta

This paper describes the history of channel changes and associated pipeline exposure problems at two major river crossings in western Alberta. Each case history reviews the hydrologic and geomorphic factors that contributed to the exposure problem, discusses the various repair options that were considered, and describes the corrective action that was taken. Fisheries-related regulatory requirements had a major impact on the proposed remediation plans and are also discussed.