Your SlideShare is downloading. ×
0
Presentation   2011 spring freshet may19 rev2
Presentation   2011 spring freshet may19 rev2
Presentation   2011 spring freshet may19 rev2
Presentation   2011 spring freshet may19 rev2
Presentation   2011 spring freshet may19 rev2
Presentation   2011 spring freshet may19 rev2
Presentation   2011 spring freshet may19 rev2
Presentation   2011 spring freshet may19 rev2
Presentation   2011 spring freshet may19 rev2
Presentation   2011 spring freshet may19 rev2
Presentation   2011 spring freshet may19 rev2
Presentation   2011 spring freshet may19 rev2
Presentation   2011 spring freshet may19 rev2
Presentation   2011 spring freshet may19 rev2
Presentation   2011 spring freshet may19 rev2
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

Presentation 2011 spring freshet may19 rev2

904

Published on

Published in: Technology
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
904
On Slideshare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
Downloads
4
Comments
0
Likes
0
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide
  • 2007
  • Increase from 1,480 m 3 /s on April 18, 2011 to 2,500 m 3 /s on May 3, 2011. Historical flow levels have been between 1,400 m 3 /s and 2,900 m 3 /s during the same time period.
  • Transcript

    • 1. 2011 SPRING FRESHET UPDATE May 19, 2011
    • 2. Presentation Outline
      • Background
          • Fraser Basin
          • Snow Water Indices (2007, 2010, 2011)
      • Fraser River Flows and Water Levels
      • Delta’s Flood Plan
      • Status of Flood Preparation
    • 3. 1. Background
      • Fraser Basin
        • Basin Area - Fraser River 233,000 km 2
        • United Kingdom 243,000 km 2
        • Fraser Basin is covers about 1/3 of the Province
      • Snow Indices
        • Snow Pack throughout the province and converted to a Snow Water Index
    • 4. 2007 Snow Water Index
    • 5. 2010 Snow Water Index
    • 6. 2011 Snow Water Index (April 1)
    • 7. 2011 Snow Water Index (May 1) Spuzzum Creek Green Mountain
    • 8. Snow Basin Indices – May 1
      • Snow packs in Lower and Middle Fraser are well above normal, while Upper Fraser is slightly above.
      • Overall, less snow levels than in 2007 and 1999.
      • Above normal freshet runoff can be expected in the Lower Fraser, leading to a modest increase in flood risk potential.
      Basin % of Normal Basin % of Normal Upper Fraser 109% Kootenay 142% Nechako 109% Okanagan-Kettle 145% Middle Fraser 122% Similkameen 141% Lower Fraser 150% South Coast 157% North Thompson 103% Vancouver Island 167% South Thompson 110% Peace 103% Nicola 151% Skeena Nass 110% Columbia 111%
    • 9. 2. Fraser River Flows and Water Levels
      • River Flood Flow Information
        • Spring Freshet typically peaks in late May or June
        • Typical Freshet Flow approx. 8 - 10,000 m3/s
        • 1894 Flood Flow – 17,000 m3/s
        • 1948 Flood Flow – 15,180 m3/s
        • Niagara Falls – 2,800 m3/s only about one fourth of the Fraser River peak flow
    • 10. Largest basin in BC ~233,000 km 2 44% 25% 16% Harrison and Chilliwack Rivers 15% Percent Contribution of Annual Runoff at Mission Hope Mission
    • 11. Flow at Fraser River Hope Gauge River Flow May 9-May 16, 2011 River Flow Feb, 2009- May, 2011
    • 12. Water Level at Fraser River Mission Gauge
      • Flow Update for 2011
      • Current Flow slightly more than 6,100 m3/s
      • Predicted Freshet Peak approx. 10,000 to 11,000 m3/s (likely close to 6m at Mission)
      • Freshet timing likely in the next 2 to 4 weeks
      • (Peak flow and Timing depends on temperature & precipitation)
      • Delta water levels are primarily tidal
      • Highest tides June 17-18, 2011
      • (1.5m freeboard on dikes)
      Current Fraser River Flows and Predictions Fraser River at Mission
    • 13. 3. Delta’s Flood Plan
      • Stage 1 – Current Condition
        • Planning and Preparedness
      • Stage 2 – Reading of 6.0 metres on Mission Gauge
        • Heightened Monitoring and Preparedness
        • More Frequent Dike Inspections
      • Stage 3 – Reading of 7.0 metres on Mission Gauge
        • Notify Public
        • Evacuate High Risk Areas
      • Stage 4 – Flooding or Dike Failure
        • Road Closures
        • Rescue Services
        • Public Information Advisories
      • Stage 5 – Recovery
    • 14. 4. Status of Delta’s Flood Preparation
      • Annual Dike Inspection – underway
      • Sand Bag Supplies – Over 140,000 bags stored at the Engineering Operations Works Yard
      • No-post barriers – Approximately 400 concrete barriers in stock and available for use
      • Monitoring Provincial Updates (predicted river level data after 5m at Mission)
      • Maintain watch for Erosion during peak flows
    • 15.
      • QUESTIONS?

    ×