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OCBC

OCBC. December 2010 Storms. Ignacio Ochoa, P.E. Director, OC Engineering Chief Engineer OC Public Works February 8, 2011. Overview Storms December 21-23, 2010. MADDEN JULIAN OSCILLATION. Madden Julian Oscillation Events are more likely in La Niña Winters

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  1. OCBC December 2010 Storms Ignacio Ochoa, P.E. Director, OC Engineering Chief Engineer OC Public Works February 8, 2011

  2. Overview Storms December 21-23, 2010

  3. MADDEN JULIAN OSCILLATION • Madden Julian Oscillation Events are more likely in La Niña Winters • La Niña Winters with strong Madden Julian Oscillations are characterized by long dry periods, broken by 5 to 10 day events with periods of heavy rainfall. • Can sometimes make up for the lack of rain the rest of the winter. • Could produce near normal seasonal rainfall totals. • Heavy rainfall rates bring more of a threat of flash floods and debris flows. NWS San Diego

  4. RAINFALL DECEMBER 2010 Greater than 100-year rainfall:             Modjeska Canyon             Aliso Viejo             Laguna Beach Greater than 50-year rainfall:             Irvine             San Juan Capistrano Greater than 25-year rainfall:             Irvine Lake             Bee Canyon             Agua Chinon             El Toro

  5. Rainfall Reports Orange County Public Works January 31, 2011 LOCATION

  6. Activation Department Operations Center and Emergency Operations Center

  7. RAINY SEASON October 15 - April 15th December 21, 2010: Orange County proclaimed a local Emergency Governor Schwarzenegger proclaimed state of emergency OC Operations and Maintenance activated Department Operations Center Orange County activated Emergency Operations Center

  8. OC Emergency Operations Center FOR IMMEDIATE RELEASE: December 21, 2010Contact: Howard Sutter, 714.834.6203 office, Howard.Sutter@ocgov.com Proclamation of Local Emergency Issued Due to Severe Winter Storms (Santa Ana, CA) — Orange County Board of Supervisors Chair Janet Nguyen has issued aProclamation of Local Emergency for the County of Orange due to the severe winter storms currently affecting the county. The proclamation cites existing conditions related to the storms that began on December 18 as well as forecast weather cond- itions that may result in flooding, debris flows, utility outages and damage from tidal surge. “Proclaiming an emergency allows the County to request additional resources as needed to respond to changing conditions,” said Donna Boston, the County’s Emergency Manager. “The County is actively managing response to any emergency incidents reported and is coordinating its response with all cities in the county. Having the proclamation of local emergency in Place widens the County’s response capabilities during these storms.” OC Emergency Operations Center OC Emergency Operations Center

  9. Department Operations Center

  10. Emergency Operations Center

  11. Emergency Operations Center

  12. COORDINATION • DOC is supported by OC Inspection, • OC Watershed, and OC Agriculture. • In the field, OC Parks provided hand • crews and equipment in response to • emergency protective measures. • O&M responded to calls for service, • including Modjeska, Silverado, Santiago, • and Trabuco Canyons. • Thursday, December 23, 2010 at 6 AM – • OC Operations and Maintenance (O&M) • continued DOC operations 24/7. Silverado Canyon December 22, 2010

  13. Mud, Debris and Flooding

  14. ROAD CLOSURES • Modjeska Grade Road • Modjeska Canyon Road • Live Oak Canyon Road • Rose Canyon Road • Blackstar Canyon Road • Silverado Canyon • Live Oak Canyon

  15. EVACUATIONS • Mandatory Evacuations: • Williams Canyon • Silverado Canyon roads: • This a Way • That a Way • Grundy Lane • Sullman Lane • Bond • Kitterman • White Canyon • Monty Lane • Hide A Way • Anderson Way • By the Way • Voluntary Evacuations: • Bell Road, Dove Canyon Silverado Canyon December 22, 2010 Silverado Canyon December 22, 2010

  16. Silverado Canyon December 22, 2010

  17. 91 Freeway Anaheim Hills December 22, 2010 Silverado Canyon December 22, 2010 Williams Canyon December 2010 Dove Canyon December 22, 2010

  18. Ladera Ranch Epona Way & Illuminita

  19. Rancho Santa Margarita December 2010 Modjeska Canyon December 2010 SANDBAGGING

  20. San Diego Creek December 22, 2010 Aliso Viejo December 25, 2010 Laguna Canyon December 22, 2010

  21. Laguna Beach December 22, 2010

  22. Laguna Beach December 23, 2010

  23. Laguna Beach December 22, 2010 Laguna Beach December 24, 2010 Laguna Beach December 24, 2010

  24. San Juan Capistrano December 22, 2010

  25. Trabuco Creek December 2010

  26. DECEMBER 23, 2010 • U.S. Army Corps released up to 5000 cfs from Prado Dam • OCFCD released up to 3,000cfs from Villa Park Dam • Irvine Lake (Santiago Reservoir) : Spillway Mode • Dams were manned 24 hours Prado Dam Villa Park Dam

  27. Damage And Repairs

  28. TRABUCO CREEK San Juan Capistrano • Levee washout 100 feet of channel on both sides downstream of Del Obispo Street • Total of 1,300 tons of large diameter rock have been placed at L02 washout • Evacuationswerevoluntary

  29. Trabuco Creek December 24, 2010

  30. Trabuco Creek December 24, 2010

  31. Trabuco Creek Channel San Juan Capistrano

  32. Modjeska Canyon ROADS Irvine Lake Modjeska Canyon CANYONS

  33. Modjeska Canyon December 23, 2010

  34. Modjeska Canyon December 2010

  35. Continuing Activities

  36. Silverado Canyon December 2010 • Continuing inspection • Repairs • Provision of erosion control materials • Engineering Assessments for canyon • residents • Seeking reimbursements for recovery • costs (ex: FEMA) Silverado Canyon December 2010 Modjeska Grade Road December 2010

  37. South Orange County December 2010

  38. Silverado Canyon Drain Cleaning Orange Park Acres Silverado Canyon Road Repair Box Culvert Washout Silverado Canyon Silt Removal

  39. Modjeska Grade Road Via Cascadita

  40. ESTIMATEDTOTAL COST of DAMAGE As of January 7, 2011, countywide estimated damages from the December 2010 Storms are as follows: Private $19,797,000 Public   $18,098,550 Federal Highway & Army Corp Projects $3,058,000  ESTIMATED TOTAL COST $40,953,550

  41. February 16, 2004

  42. ARkStorm Blue areas indicate ARkStorm flooding as projected by models used in the scenario.

  43. ARkStorm hypothetical flooding in Los Angeles and Orange Counties

  44. In $1,000s FLOOD COUNTY COUNTY WIND FLOOD WIND ARkStorm Property Loss by County • $50 billion flood damage in Orange County • $300 billion in State of California

  45. Questions ? Laguna Beach Pacific Coast Highway December 22, 2010

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