the bridge for kids
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Orting’s Bridge for Kids
Jack Fitch, Dawa Sherpa, Jeff Baxter, Ryan McQueeny, Karin Erwin
Volcanic Hazards(Mt. Rainier)
• Toxic Gases- wind will decide where it goes, quick dissipation• Landslides- could turn into a lahar and be dangerous• Lava Flows- high viscosity, lower risk to travel far and slow moving• Lateral Blasts- large blasts are rare• Tephra
– building collapse – breathing issues– decrease visibility – Wind=unpredictable
• Pyroclastic Flows!
• Many Associated Hazards… a bridge doesn’t solve all problems
The Hazard: Lahars• In Hindi: wave• In English: Wet, Hot
Concrete• Contents
– Initially glacial and snow melt
– Then, <20% water, mud, rocks, boulders, trees, cows, cars and other debris
– Anything in the way!
The Hazard: Lahars• Lahars travel down through low spots…• Speeds up to 40m/s (90mi/hr) depending on
conditions
Great Lahars in History
• Nevado del Ruiz, Colombia – 1985: 23,000 buried
and killed under the lahar
• Mt. Pinatubo, Philippines– 1991: 1500 killed by
soupy ash water from typhoon after eruption
Lahar History in the Pacific Northwest
• The Source: Mt. Rainier’s Volcanic Activity
• Two Big Ones– Osceola (5000ya)– Electron (500ya)
Orting History
• Settled in 1854
• High carbon lahar path + drainage basin = Fertility
– Hops, produce, farming,Christmas tree farms
• Supplier for coal towns of Carbinado and Wilkeson
• Population 6,075
• 2008 Census:– 44% of households have children
• At the foot of Mt. Rainier…
Orting in Real Life
Orting, Washington
Orting, Washington•Lahars travel down and through low spots…
●River valleys or past lahar paths
Low Spot!
Why Orting?
• Orting lies in a high risked lahar flow zone• How to alert the town in case of the actual
event? • How to evacuate the people of Orting to
safety in the short span of time?
What can be done?
• The City of Orting installed sensors called Acoustic Flow Monitors.
• Designated evacuation route consisting both walking and driving to higher grounds following the beginning of the two sirens.
Problem(s) in the Orting School District
• Unsafe Escape Route for >2050 Students– Orting Primary, Middle and High Schools– Ptarmigan Ridge Intermediate School
• Dangerous Crossing– SR162
• Crazy/Erratic Drivers!
PTA finds an Alternative
• Build a bridge across the Carbon River for faster and safer evacuation
The 2003 Feasibility Study
• KPFF Consulting Engineers• Several Considerations
Bridge for Kids
• The project has passed through its initial phase. • Currently working on engineering and designing
aspect. • Two options for the bridge.
- Ramp or Stairs?
Bridge for Kids
• Initially estimated total cost of the project $12.7 million • Currently received only $2.8 million from the state and
federal funding
Looming Issues
• Practicality– School in session only 12% of time
• Accessibility Bridge must meet ADA standards to receive federal funding– Stairs cheaper but do not meet ADA– Aesthetically Displeasing
• Timeliness– Parents are worried. When will it be done?
• Funding– Flimsy Funding Agencies back out?– Post-construction maintenance?
Current Group Direction
• Division of Topics– Karin
• Lahars: all about them
– Dawa• History of Lahars in the NW
– Ryan• The Bridge for Kids: What is it?
– Jeff• The Future of the Bridge for Kids
– Jack• Potential Problems Issues
Future Directions
• B4K In Depth?• Interview Targets
– Chris Fowler: President of Bridge for Kids– Rex Kurbs: Ptarmigan Ridge Intermediate Principal– Barbara Baumi: Treasurer for Bridge for Kids– Michael Mariano: Pierce County Project Manager
• Photos– Schools– Proposed Bridge Site– SR162
• Investigate SR162Tunnel?
Sources
• www .bridgeforkids.org• http:// volvanoes.usgs.gov• http://www.geotimes.org/apr04/feature_MountRainier.html• http://www.geo.mtu.edu/volcanoes/hazards/primer/lahar.html• http:// library.thinkquest.org/andes/colombia/ruiz.html• http://www.suite101.com/view_image.cfm/731368• Lecture Presentation Mike Valentine, Friday, 6/5/2009. • http://www.wsdot.wa.gov/projects/sr162/ortingbridgeforkids/
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