Abstract

Flood Analysis and Mapping for Prince George, British Columbia
Track: Water Resources
Authors: M. Sarah North

In 2007-2008, the City of Prince George experienced freshet flooding along the Fraser River, followed by severe ice-related flooding along the Nechako River. To assess flood risks and develop flood control solutions, the City retained a team of consultants led by NHC.
The project began with river surveys, hydrologic assessments and detailed ice evaluations. One-dimensional and two-dimensional hydraulic modelling was supported by GIS input. Flood control solutions were developed and prioritized following community meetings.
The final phase involved preparation of floodplain maps. Hydraulic modelling results were converted to flood depth and extent maps in GIS. GIS tools were used to present a variety of flood zone and freeboard options for consideration by City staff and project engineers, and final results were incorporated into a set of 1:5,000 scale maps to accompany the City's updated floodplain bylaws.