Part iii-d – Dam Failure



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22.0 hours

31.0 miles

7 NAVD

32.75 hours

2 feet


**above reference points are the closest approximate main street along plotted timeline of USACE inundation maps
NAVD = North American Vertical Datum (NAVD). In this report “sea level” refers to the National Geodetic Vertical Datum of 1929 (NGVD of 1929)--a geodetic datum derived from a general adjustment of the first-order level nets of both the United States and Canada, formerly called Sea Level Datum of 1929 it will differ to actual sea level by 71 cm or 2.3 feet. The acronym has been adopted by FEMA FIS and FIRM maps to NAVD. 

Major roads subject to flooding include Interstate Highway 5 (Santa Ana Freeway), #405 (San Diego Freeway), and #605 (San Gabriel River Freeway) and State Highways #l (Pacific Coast Highway), #22 (Garden Grove Highway), #55 (Newport Freeway), #57 (Orange Freeway), #7l (Corona Highway), #90 (Imperial Highway), and #9l (Riverside Freeway).




Community Dam Failure Issues



What is Susceptible to Dam Failure?


Life and Property

Based on the “local” history events of flooding along the Santa Ana River, we can conclude that the CCCD service area would be heavily impacted. The largest impact on the communities from a dam failure event is the loss of life and property.


The County and Orange County Cities would utilize every method known to warn the public of an impending dam failure including the following systems:


Emergency Alerting System (EAS) on the AM/FM radio

Alert OC (residents should register for this service)

Police and Fire sirens

Police helicopter loudspeakers

Door-to-door canvassing

Warning Siren System (Huntington Beach only)



This would greatly reduce injuries and loss of life.


Residential

Property along the flood channel and coastline could be devastated. Dam failure could potentially destroy or damage hundreds to thousands of homes spreading debris for miles. A dam failure could devastate the local economy.


Commercial

The local governments in California and Orange County rely heavily on tourism and sales tax. A dam failure event would heavily impact tourism and businesses by damaging property and infrastructure and by interrupting business and services. Any residential or commercial structure with weak reinforcement in the impact area would be susceptible to damage.


Infrastructure

A Prado Dam failure can cause damaged buildings, power lines, and other property and infrastructure due to flooding. It could result in collapsed or damaged buildings or blocked roads and bridges, damaged traffic signals, streetlights, and parks, among others. Damage to public water and sewer systems, transportation networks, and flood channels would greatly impact the life of the CCCD students, faculty and staff.


Roads blocked by objects during a dam failure may have severe consequences to people who are attempting to evacuate campuses or who need emergency services. Emergency response operations can be complicated when roads are blocked by water or when power supplies are interrupted. Industry and commerce can suffer losses from interruptions in electric services and from extended road closures. They can also sustain direct losses to buildings, personnel, and other vital equipment. There are direct consequences to the local economy resulting from dam failure related to both physical damages and interrupted services.


Campuses

Campuses must evacuate as soon as a dam failure warning is issued to the local area. Each campus should understand how the threat impacts their facilities and be able to give students, staff and faculty instructions for safely evacuating the impact area. The District EOC would be activated to coordinate between the Orange County Operational Area EOC and the activated Campus EOCs.


Campuses not in the inundation zones should stand by and be ready to set up their facilities as shelters for the evacuated and displaced residents. During the recovery phase of the incident, campuses should offer their sites as Local Assistance Centers. It must be understood that the Water Movement Timeline and Over the Banks Depth figures are for worse-case scenario when the dam is filled to capacity. Less water in the dam would result in a less severe impact. All of this must be taken into consideration.




Existing Mitigation Activities


Orange County, the State of California, and Federal government agencies have implemented dam failure mitigation activities over the years. Orange County and its cities have received many awards and been acknowledged for being leaders in terms of preparing and training its residents for disasters. Some of the current mitigation programs include:
Improvements of the Santa Ana River Flood channel (Mainstem Project)

City/County Flood Control Projects

City/County Master Plan Storm Drain Projects

City/County Master Plan Pump Station Projects

City Emergency Operations Plans

Orange County Operational Area Emergency Operations Plan

Coast Community College District Emergency Operations Plan

Orange County Operational Area Dam Failure Plan, 2006



CCCD Disaster Preparedness Public Education Community Emergency Response Team/Business Emergency Response Team (CERT/BERT) class series that teaches campus personnel how to respond to campus emergencies
Table - CCCD Dam Failure Threat by Site


Identifier

Site Name

Asset Count

Total Square Footage

Total Replacement Cost

Elevation

Impact

(Low, Medium or High)

A1

Coast Community College District Office

4

73,892

29,762,830

79

Medium

A2

KOCE Transmitter

2

1,749

1,332,000

1165

Low

A3

Transportation Facility

1

7,712

2,439,200

66

Medium

B1

Orange Coast College

158

942,869

324,736,020

59


Medium

B2

Orange Coast College Sailing Center

2

11,569

3,751,040

Sea level

High

C1

Golden West College

86

652,890

232,811,780

12

High

D1

Coastline Community College Administrative Center, FV

2

61,505

21,437,100

49

High

D2

Coastline Community College Art Gallery

1

3,283

131,300

23

High

D3

Coastline Costa Mesa Center, CM

15

27,577

736,400

62

Medium

D4

Coastline Community College GG Center, GG

1

48,000

22,829,000

102

High

D5

Coastline Community College Le-Jao Center

3

28,067

10,598,900

49

High

D6

Coastline Community College NB Center, NB










112

High

D7

Coastline Regional One Stop Center Irvine

1

21,420

646,700

249

Medium

D8

Coastline Regional One Stop Center, Wm

1

24,992

693,000

49

High

D9

Coastline Community College Tech Center, FV

1







52

High

TOTALS

651,905,270









Dam Failure Mitigation Strategies

A dam failure is a much larger incident than one school district can mitigate or manage. The CCCD does not own or control any dam. The CCCD can only work in conjunction with other public agencies in most dam failure mitigation projects.


The dam failure mitigation strategies provide direction or specific activities that organizations and residents can undertake to reduce risk and prevent loss from a dam failure event.







Long Term Mitigation Strategies




Hazard:

Dam Failure #1

Action Item:

Dam Failure Education Campaign

Coordinating Organization:

EHS/Emergency Management Coordinator

Ideas for Implementation:

Include dam failure education in all existing EOC and CERT/BERT Classes. Utilize research from this plan to educate staff, faculty and students

Time Line:

Ongoing

Constraints:

EHS/Emergency Management Coordinator limited time

Classes are voluntary often resulting in low attendance



Plan Goals Addressed

X

Promote Public Awareness




Create Partnerships and Implementation




Protect Life and Property




Protect Natural Systems




Strengthen Emergency Services



Hazard:

Dam Failure #2

Action Item:

Support the County, State, Federal Government and Army Corps of Engineers in any dam failure projects that impact the CCCD service area and facilities

Coordinating Organization:

EHS/Emergency Management Coordinator

Ideas for Implementation:

  • Through the Orange County Emergency Management Organization (OCEMO)

  • When projects that will help protect the CCCD are recommended, have the CCCD Board of Trustees write letters of support.

Time Line:

Ongoing

Constraints:

Learning of proposed projects

Plan Goals Addressed




Promote Public Awareness

X

Create Partnerships and Implementation

X

Protect Life and Property




Protect Natural Systems




Strengthen Emergency Services



Hazard:

Dam Failure #3

Action Item:

Write a Prado Dam Evacuation Plan for all CCCD sites

Coordinating Organization:

EHS/Emergency Management Coordinator leading the Public Safety Directors from each campus through the process

Ideas for Implementation:

  • Bring together the CCCD CRASH Team

  • Work together to develop an evacuation plan for each CCCD site

Time Line:

Ongoing

Constraints:

Learning of proposed projects

Plan Goals Addressed




Promote Public Awareness

X

Create Partnerships and Implementation

X

Protect Life and Property




Protect Natural Systems




Strengthen Emergency Services



III-D Dam Failure

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