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City of Williams Lake awards flood risk assessment, mapping, and mitigation study contract

The City of Williams Lake has awarded a $134,000 contact for a Flood Risk Assessment, Mapping, and Mitigation Study to Tetra Tech Canada.

Earlier this year, the City was successful in receiving $150,000 from a Flood Risk Assessment, Flood Mapping and Flood Mitigation Planning grant to put towards the study.

The scope of the Flood Risk Assessment, Flood Mapping, and Mitigation Study is as follows:

  • Site inspection and survey for hydraulic and geomorphological analysis for a 50-year, 100-year, 200-year, 300-year and 500-year flood event; 
  • Hydraulic modelling; 
  • Flood hazard assessment including wind wave and wave run-up assessment; 
  • Flood inundation, hazard and erosion mapping: this will identify the extent of inundation and hazard (low, medium, high) around the lake and Williams Lake River; 
  • Flood risk analysis and mapping; 
  • Flood construction elevation levels; 
  • Development of flood mitigation plan mainly for the River Valley area infrastructure and Class D cost estimates to be able to apply for future mitigation grants. 
  • Identify recommendations for future flood mitigation efforts.

A total of 8 proposals were received. Tetra Teach received the highest weighted score of 93.83 and presented a firm understanding of all the project requirements and deliverables. Though they were not the least expensive contract, they presented the most comprehensive scope of work within the given budget.

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