2006 aeg godwin presentation
TRANSCRIPT
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AEG Annual Meeting-Boston
Mitigation Design of Geohazards Causedby Fire at Hydroelectric Facilities
• W.H. Godwin, CEG William Lettis & Associates• Don Quigley, GE MACTEC Engineering & Consulting, Inc.• C. Liu, PE, SFPUC Engineering & Design Bureau
November 1, 2006
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Introduction
• Purpose• Case Study
– Early Fire– Damage Assessment– Aerial and Field Mapping– Mitigation Design– Construction
• Acknowledgements and Questions
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Case Study
Kirkwood Powerhouse & Penstock Facilities
Tuolumne County, California
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Early Fire
Early Fire OverviewAugust 9-14 2004
1600 acres
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Early Fire
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Early Fire
• Life & Property– CCSF Life & Property– Public Life & Property
• Soil & Water Quality• Special Areas
-Wild and Scenic River-Heritage Oaks
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Early Fire
Cottages andFacilities
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Early Fire• Conceptual Treatments for:
-Powerhouse-Residences-Roads-Penstock-Transmission Lines
• Detailed engineering assessment of drainageand structure protection by SFPUC
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Early Fire
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Damage Assessment
• Erosion potential• Rock fall Hazard• Penstock integrity• Drainage
improvements
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Damage Assessment
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Damage Assessment
Rock fall hazard
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Damage Assessment
October Storm2004
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Aerial and Field Mapping
View East
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Aerial and Field Mapping
View West
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Aerial and Field Mapping
Sawmill MtnGranodiorite(Ksm)
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Aerial and Field Mapping
Granite Crk Tonalite (Jgc)
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Aerial and Field Mapping
Valve house
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Aerial and Field Mapping
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Aerial and Field Mapping
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Aerial and Field Mapping
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Aerial and Field Mapping
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Aerial and Field Mapping
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Mitigation Design
• Rock Fall Simulation• HEC Modeling• Localized rock bolting, scaling and mesh• Culvert design• Revegetation
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Mitigation Design
Input Parameters• Rock Shape• Rock size• Slope roughness• Slope length/angle
Output• Velocity• Bounce Height• Kinetic Energy
Colorado Rock Fall Simulation CRSPProgram
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Mitigation DesignGeologic Hazard• Source Area• Source rocks• Slope• Critical Structures• Relative hazard
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Mitigation Design
CRSP Inputs
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Mitigation Design
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Mitigation DesignSurface profile and Analysis Pts.
Bounce height vs. Slope length
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Mitigation Design
• Design outputs for 11 fences• Energy ranges from 241kJ to 1575kJ• Bounce height (90%) range 3 ft to 24ft• Did not factor in trees as barriers• Fence Heights of 2 to 4 meters
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Mitigation DesignHydrologic Analysis• 25 year return interval, 24-hour hydrologic
analysis for both pre- and post-fire conditions• 100 year return interval, 24-hour duration
hydrologic analysis for both pre- and post-fireconditions
• Calculation of parameters used in the HEC-1model followed the NRCS methodology.
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Mitigation Design
Drainage Recommendations• New culvert design based on 25-yr return
period flows• Erosion Control applications• Rip rap and road crossings
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Mitigation Design
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Construction
December-May 2005• Rock fencing (3131LF)• Draped mesh, spot bolting• New access road and culverts• Hardened Crossings• Penstock drains and safety lines• New potable water tanks
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Acknowledgments and Questions