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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 - PowerPoint PPT PresentationTRANSCRIPT
OCBCOCBC
December 2010December 2010StormsStorms
Ignacio Ochoa, P.E.Ignacio Ochoa, P.E.Director, OC EngineeringDirector, OC EngineeringChief EngineerChief EngineerOC Public WorksOC Public WorksFebruary 8, 2011February 8, 2011
OverviewStorms
December 21-23, 2010
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
MADDEN JULIAN OSCILLATION
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
RAINFALL DECEMBER 2010
Rainfall ReportsOrange County Public Works
January 31, 2011
LOCATION
ActivationActivationDepartment Operations CenterDepartment Operations Center
andandEmergency Operations CenterEmergency Operations Center
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
December 21, 2010:
RAINY SEASONOctober 15 - April 15th
OC Emergency Operations Center
OC Emergency Operations Center
OC Emergency Operations Center
FOR IMMEDIATE RELEASE: December 21, 2010Contact: Howard Sutter, 714.834.6203 office, [email protected] of Local Emergency Issued Due to Severe Winter Storms
(Santa Ana, CA) — Orange County Board of Supervisors Chair Janet Nguyenhas issued a Proclamation 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 outagesand 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 thesestorms.”
Department Operations Center
Emergency Operations Center
Emergency Operations Center
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.
COORDINATION
Silverado CanyonDecember 22, 2010
Mud, DebrisMud, Debrisandand
FloodingFlooding
Modjeska Grade Road Modjeska Canyon Road Live Oak Canyon Road Rose Canyon Road Blackstar Canyon Road Silverado Canyon Live Oak Canyon
ROADROADCLOSURESCLOSURES
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
EVACUATIONS
Silverado CanyonDecember 22, 2010
Silverado CanyonDecember 22, 2010
Silverado CanyonSilverado CanyonDecember 22, 2010December 22, 2010
Silverado CanyonSilverado CanyonDecember 22, 2010December 22, 2010
91 Freeway91 FreewayAnaheim HillsAnaheim Hills
December 22, 2010December 22, 2010
Williams CanyonWilliams CanyonDecember 2010December 2010
Dove CanyonDove CanyonDecember 22, 2010December 22, 2010
Ladera RanchEpona Way & Illuminita
Rancho Santa MargaritaDecember 2010
SANDBAGGING
Modjeska CanyonDecember 2010
Aliso ViejoDecember 25, 2010
San Diego CreekDecember 22, 2010
Laguna CanyonDecember 22, 2010
Laguna BeachLaguna Beach
December 22, 2010December 22, 2010
Laguna BeachLaguna Beach
December 23, 2010December 23, 2010
Laguna BeachDecember 22, 2010
Laguna BeachDecember 24, 2010 Laguna Beach
December 24, 2010
San Juan CapistranoDecember 22, 2010
Trabuco CreekDecember 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
DECEMBER 23, 2010
Prado Dam
Villa Park Dam
DamageAnd
Repairs
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
Evacuations were voluntary
TRABUCO CREEKSan Juan Capistrano
Trabuco CreekDecember 24, 2010
Trabuco CreekDecember 24, 2010
Trabuco Creek Channel
San Juan Capistrano
ROADS
CANYONS
Irvine Lake
Modjeska Canyon
Modjeska Canyon
Modjeska CanyonDecember 23, 2010
Modjeska CanyonDecember 2010
ContinuingActivities
Silverado CanyonDecember 2010
Silverado CanyonDecember 2010
Continuing inspection
Repairs
Provision of erosion control materials
Engineering Assessments for canyon residents
Seeking reimbursements for recovery costs (ex: FEMA)
Modjeska Grade RoadDecember 2010
South Orange CountyDecember 2010
Orange Park Acres
Silverado CanyonSilt Removal
Silverado CanyonRoad Repair
Box Culvert Washout
Silverado CanyonDrain Cleaning
Modjeska Grade Road
Via Cascadita
As of January 7, 2011, countywide estimated damages from the December 2010 Storms are as follows: Private $19,797,000Public $18,098,550 Federal Highway &Army Corp Projects $3,058,000
ESTIMATEDTOTAL COST
ofDAMAGE
ESTIMATEDESTIMATEDTOTAL COSTTOTAL COST
$40,953,550$40,953,550
February 16, 2004February 16, 2004
Blue areas indicate Blue areas indicate ARkStorm flooding as ARkStorm flooding as projected by models projected by models used in the scenarioused in the scenario..
ARkStormARkStorm
ARkStorm hypothetical flooding in Los Angeles and Orange CountiesARkStorm hypothetical flooding in Los Angeles and Orange Counties
ARkStorm ARkStorm Property Loss by CountyProperty Loss by County
COUNTY WINDFLOOD WINDFLOODCOUNTY
$50 billion flood damage in Orange County
$300 billion in State of California
In $1,000s
Laguna BeachPacific Coast HighwayDecember 22, 2010
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