Presentation on theme: "Spring Freshet 2008 Fraser Valley. 2008 Freshet Flood Risk (as of Feb 19/08) Fraser River snow packs are near long-term average (and way below 2007)"— Presentation transcript:
Spring Freshet 2008 Fraser Valley
2008 Freshet Flood Risk (as of Feb 19/08) Fraser River snow packs are near long-term average (and way below 2007) Fraser River flood risk is “neutral” Significantly high flow on Fraser is possible, but would require extreme spring weather conditions: –8+ days of very hot weather, mid May to early June –A large, widespread frontal rain storm near time of snowmelt peak (Pineapple Express) There is no analogue for this in historic record back to 1948, with a “normal” snow pack.
Areas of above-normal flood risk are: –North Thompson River –Lower Fraser & Coast Mountain tributaries: Whistler – Pemberton area (e.g., Birkenhead R., etc.) 2008 Freshet Flood Risk ( continued )