SB 901 requires that POUs must present their wildfire mitigation plan at an appropriately noticed public meeting and receive public comment. The POU must also verify that the wildfire mitigation plan complies with all applicable rules, regulations, and standards. POUs must also have their plan reviewed by a qualified independent evaluator to assess the comprehensiveness of the plan every three years, which occurred last year.
In 2019, two new bills (SB 1054 and SB 111) made additional major reforms relating to wildfires. As part of these reforms, SB 111 created a new state agency called the California Wildfire Safety Advisory Board (“Board”). The members of the board must be selected from industry experts, academics, and people with labor and workforce safety experience. At least three members must be experienced in the safe operation, design, and engineering of electrical infrastructure. SB 1054 requires that all POUs must submit their wildfire mitigation plans to the Board by July 1 of each year, starting i n 2020. The Board will then review the POU plans and will provide comments and advisory opinions on the content and sufficiency of the plans. If additional Board requirements are received this year, further revisions of the adopted updated MVU Wildfire Mitigation Plan may be required. Any substantive changes will be brought to the City Council for consideration.
Pursuant to Public Utilities Code, Section 8387, MVU has prepared the required update to the wildfire mitigation plan. Updates include fire ignition data for reporting year 2021, Public Safety Power Shutoff notification procedures, and the inclusion of the Wildfire Safety Advisory Board’s Informational Response document. Staff has reviewed MVU’s wildfire mitigation plan and concluded that the plan meets all the required criteria as provided in Section 8387. Staff recommends adopting the Moreno Valley Utility 2022 Wildfire Mitigation Plan.
MVU will submit its adopted updated wildfire mitigation plan to the California Wildfire Safety Advisory Board prior to July 1, 2022.
ALTERNATIVES
1. Approve the updated MVU Wildfire Mitigation Plan. The plan provides baseline procedure and practice of safe and effective operation of the MVU electric system while minimizing risks of wildfires. Adoption of the plan will keep MVU in compliance with state mandates. This update incorporates current recommended additions and changes outlined in the Guidance Advisory Opinion issued by the California Wildfire Safety Advisory Board. Staff recommends this alternative.
2. Do not approve the MVU Wildfire Mitigation Plan. This action would delay the submission of an adopted Wildfire Mitigation Plan and MVU will not be in compliance with state mandates. Staff does not recommend this action.
FISCAL IMPACT
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There is no cost associated with the approval of the MVU Wildfire Mitigation Plan.
NOTIFICATION
Publication of the Agenda.
PREPARATION OF STAFF REPORT
Prepared By: Department Head Approval:
Dean Ayer Michael Lloyd
Senior Management Analyst Public Works Director/City Engineer
Concurred By:
Jeannette Olko
Electric Utility Division Manager
CITY COUNCIL GOALS
Positive Environment. Create a positive environment for the development of Moreno Valley's future.
CITY COUNCIL STRATEGIC PRIORITIES
1. Economic Development
2. Public Safety
3. Library
4. Infrastructure
5. Beautification, Community Engagement, and Quality of Life
6. Youth Programs
Objective 4.1: Develop a Moreno Valley Utility Strategic Plan to prepare for the 20 22 expiration of the ENCO Utility Systems agreement.
ATTACHMENTS
To view large attachments, please click your “bookmarks” on the left hand side of this document for the necessary attachment.
1. 2022 WMP Update
2. Resolution Wildfire Mitigation Plan 01042022
APPROVALS
Budget Officer Approval Approved . 11/22/21 7:34 AM City Attorney Approval Approved .
City Manager Approval Approved . 11/29/21 9:15 AM
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HISTORY:
12/07/21 City Council REMOVED FROM AGENDA
Next: 01/04/22
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2022 Wildfire
Mitigation Plan
November 18, 2021
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Table of Contents
I. Utility Context Summary ................................................................................................................................................. 3 II. Overview ......................................................................................................................................................................... 3 A. Policy Statement ......................................................................................................................................................... 3 B. Purpose of the Wildfire Mitigation Plan ..................................................................................................................... 3 C. Organization of the Wildfire Mitigation Plan .............................................................................................................. 3 III. Objectives of the Wildfire Mitigation Plan .................................................................................................................. 4 IV. Roles and Responsibilities ........................................................................................................................................... 4 A. Utility Governance Structure ...................................................................................................................................... 4 B. Wildfire Prevention ..................................................................................................................................................... 5 C. Wildfire Response and Recovery ................................................................................................................................ 6 D. Standardized Emergency Management System ......................................................................................................... 7 V. Wildfire Risks and Drivers Associated with Design, Construction, Operation, and Maintenance .................................. 9 A. Particular Risks and Risk Drivers Associated with Topographic and Climatological Risk Factors ............................... 9 B. Enterprise-wide Safety Risks ....................................................................................................................................... 9 VI. Wildfire Preventative Strategies ............................................................................................................................... 10 A. High Fire Threat District ............................................................................................................................................ 10 B. Design and Construction Standards .......................................................................................................................... 10 C. Vegetation Management .......................................................................................................................................... 10 D. Inspections ................................................................................................................................................................ 10 E. California Public Utility Commission Wildfire Threat Map ....................................................................................... 11 F. CalFire Fire Threat Map ............................................................................................................................................. 12 G. Reclosing Policy ......................................................................................................................................................... 12 H. De-energization ......................................................................................................................................................... 12 VII. Rest
oration of Service ............................................................................................................................................... 12 VIII. Evaluation of the Plan ............................................................................................................................................... 13 A. Metrics and Assumptions for Measuring Plan Performance .................................................................................... 13 B. Impact of Metrics on Plan ......................................................................................................................................... 14 C. Monitoring and Auditing the Plan ............................................................................................................................. 14 D. Identifying and Correcting Deficiencies in the Plan .................................................................................................. 14 E. Monitoring the Effectiveness of Inspections ............................................................................................................ 14 IX. Attachment A 2021 Informational Response..............................................................................................................15 A.16.a
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I. Utility Context Summary
Utility Name Moreno Valley Utility
Size in Square Miles 33.48 square miles
Assets ☐ Transmission ☑ Distribution ☑ Generation
Number of Customers Served 6,524 as of December 2020
Customer Classes ☑ Residential ☑ Government ☐ Agricultural ☑ Small/Medium Business ☑ Commercial/Industrial
Location/Topography ☑ Urban ☐ Wildland Urban Interface
☐ Rural/Forest ☐ Rural/Desert ☐ Rural/Agriculture
Percent Territory in
CPUC High Fire Threat Districts
☑ Includes maps 0% in Tier 2 0% in Tier 3
CAL FIRE FRAP Map Fire Threat Zones ☑ Includes maps 0% Extreme 0% Very High 0% High Existing Grid Hardening Measures ☑ Describes hardened & non-hardened infrastructure Utility Fire Threat Risk Level ☐ High ☑ Low ☐ Mixed
Impacted by another utility’s PSPS? ☑ Yes ☐ No
Mitigates impact of another utility’s PSPS? ☑ Yes ☐ No
Expects to initiate its own PSPS? ☐ Yes ☑ No
Prevailing wind directions & speeds by season ☐ Includes maps ☐ Includes a description II. Overview
A. Policy Statement
Moreno Valley Utility’s overarching goal is to provide safe, reliable, and economic electric service to its local community.
In order to meet this goal, Moreno Valley Utility constructs, maintains, and operates its electrical lines and equipment in a manner that minimizes the risk of catastrophic wildfire posed by its electrical lines and equipment.
B. Purpose of the Wildfire Mitigation Plan
Moreno Valley Utility’s (MVU) entire electric supply system is located underground in conduit and vaults. Historically, undergrounded electric lines have not been associated with catastrophic wildfires. The undergrounding of electric lines serves as an effective mitigation measure to reduce the potential of power-line ignited wildfires. Based on a review of local conditions and historical fires, MVU has determined that its electrical lines and equipment do not pose a significant risk of catastrophic wildfire.
Despite this low risk, MVU takes appropriate actions to help its region prevent and respond to the increasing risk of devastating wildfires. In its role as a public agency, MVU closely coordinates with other local safety and emergency officials to help protect against fires and respond to emergencies. In its role as a utility, MVU follows all applicable design, construction, operation, and maintenance requirements that reduce safety risks associated with its system. This Wildfire Mitigation Plan describes the safety-related measures that MVU follows to reduce its risk of causing wildfires.
C. Organization of the Wildfire Mitigation Plan
This Wildfire Mitigation Plan included the following elements:
• Objectives of the plan;
• Roles and responsibilities for carrying out the plan; • Identification of key wildfire risks and risk drivers; A.16.a
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4 • Description of wildfire prevention, mitigation, and response strategies and programs; • Metrics for evaluating the performance of the plan and identifying areas for improvement; • Review and validation of the plan; and
• Timelines.
III. Objectives of the Wildfire Mitigation Plan
The primary goal of this Wildfire Mitigation Plan is to describe MVU’s existing programs, practices, and measures that effectively reduce the probability that MVU’s electric supply system could be the origin or contributing source for the ignition of a wildfire. To support this goal, MVU regularly evaluates the prudent and cost-effective improvements to its physical assets, operations, and training that can help reduce the risk of equipment-related fires.
The secondary goal of this Wildfire Mitigation Plan is to improve the resiliency of the electric grid. As part of the development of this plan, MVU assesses new industry practices and technologies that will reduce the likelihood of an interruption (frequency) in service and improve the restoration (duration) of service.
IV. Roles and Responsibilities
A. Utility Governance Structure
Electric Utility
Special Districts
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5 The City of Moreno Valley is a general law city that operates under a Council-Manager form of government. MVU is governed by a five-member City Council. Four Council Members are elected by district to staggered, four-year terms, while the Mayor is directly elected. The council appoints the City Manager, who oversees the daily operations of the City. Volunteer Commissions and Boards, as well as several Citizen Advisory Committees help guide the Council in its decisions. The City Council formed a five-member Utilities Commission, whose purpose is to provide additional review for all matters pertaining to MVU. Commissioners are citizen volunteers, appointed by the City Council for three-year terms.
MVU's Wildfire Mitigation Plan is developed by staff and then reviewed by the Division Manager, Public Works Director, Assistant City Manager, City Manager, Utilities Commission, and the five-member City Council. City Council votes on approval and the plan is approved with a majority vote.
MVU funds wildfire mitigation activities through current rate payer revenues. These funds are augmented by grant awards. Mitigation projects typically take the form of revised equipment design standards and system hardening Capital Improvement Projects.
B. Wildfire Prevention
MVU staff, in partnership with its maintenance and operations provider, is responsible for electric facility design, maintenance, and inspection, including vegetation management. Although MVU’s electrical distribution system is 100% underground, MVU follows best practices to prevent ignition of wildfires from its equipment. These items include:
• MVU performs routine maintenance of all distribution facilities. • MVU adheres to a seasonal weed abatement and vegetation management schedule to maintain at-risk sites. • MVU contracts for seasonal weed abatement services. Standard clearances as defined by General Orders 95, 128, 165, and 174, are maintained as part of routine maintenance cycles. All electric distribution facility equipment requiring repair and maintenance are addressed and corrected as they are identified. Annual inspections and maintenances of MVU substation facilities identified no deficiencies for 2020. • MVU abides by Municipal Code 6.40 to abate trees, shrubs, weeds, and grass at all MVU facilities. Including Landscaping, vegetation, or improved or unimproved property in any of the following conditions: containing weeds, dry grasses, dead trees, dead shrubs, or any other material which bears seeds of a wingy or downy nature or which by reason of their size, manner of growth or location, constitute a fire hazard or a threat to public health, or containing weeds, vegetation, grasses, trees or shrubs, including, but not limited to sagebrush, chaparral, and Russian Thistle (tumbleweed) which, when dry, will in reasonable probability constitute a fire hazard or be blown onto adjoining property by prevailing winds; trees and shrubs containing dead or fallen limbs or branches that may present a safety hazard; trees or shrubs which are overgrown or contain limbs or branches that restrict, impede or obstruct the use of or obscure the visibility of pedestrians or drivers using the public rights-of-way, easements, sidewalks or roadways; overgrown vegetation likely to harbor vermin, insects or rodents of any kind.
• Electric system operates in a manner that will minimize potential wildfire risks. • Take all reasonable and practicable actions to minimize the risk of a catastrophic wildfire caused by MVU electric facilities.
• Coordinate with federal, state, and local fire management personnel as necessary or appropriate to implement MVU’s Wildfire Mitigation Plan.
• Immediately report fires to local fire department, Emergency Management Program Manager, MVU administration, and other City Officials, pursuant to existing MVU practices and the requirements of this Wildfire Mitigation Plan.
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6 • Coordinate with City Emergency Operations Center to disseminate safety warnings, emergency public information, and evacuation notices to local residents. • MVU adheres to City of Moreno Valley personnel policy 5.11 for Employee Disaster Notification and Reporting. • Take corrective action when the staff witnesses or is notified that fire protection measures have not been properly installed and maintained.
• Comply with relevant federal, state, and industry standard requirements, including the industry standards established by the California Public Utilities Commission.
C. Wildfire Response and Recovery
Internally, MVU’s distribution system is controllable remotely through a Supervisory Control and Data Acquisition (SCADA) system networked to all substations and circuits. MVU field staff utilize hard line telephones, cellular telephones, and portable radios to communicate with internal and external stakeholders during an outage or emergency. MVU’s Outage Management System, Utility Maintenance Management System, and Dispatching System all auto-generate notifications to field, office, and administrative staff. MVU is enrolled in several mutual aid networks (APPA, CA Disaster & Civil Defense, CA Utilities Emergency Association) to facilitate expedited response and recovery from severe storms, natural disasters, or mass outages.
The City of Moreno Valley maintains a two-way (LF, HF, VHF, and UHF) mobile and base stations for communications enhanced by repeater system to extend the coverage area. This includes three repeater channels and three unit-to- unit/talk-around channels in the 800 MHz Public Safety band. The City of Moreno Valley owns ten iridium satellite phones that are issued to key personnel in the city during an emergency. Mobile radio communications are available utilizing the Moreno Valley Police Mobile Command Center (MCC). The command center has the capability of patching Sheriff, California Highway Patrol (CHP), Riverside Police, CALFIRE, March Air Reserve Base and Moreno Valley Park Rangers all on the same frequency at the same time. Moreno Valley has an Amateur Civil Emergency Services/Radio Amateur Civil Emergency Services (MV ACES/RACES) group, which operates on ham radio frequencies in support of governmental emergency communications. MV ACES/RACES can augment existing systems and establish communication links with otherwise inaccessible areas. They are also capable of sending live video and audio from an incident site to our City’s emergency operations center via the ham radio.
At the county level, a Riverside County Emergency Operations Center (EOC) talk group is programmed into the Omniquest radio and is used to communicate with EOCs within Riverside County during a disaster or emergency. The City of Moreno Valley also has low-band disaster net radios to communicate with all EOCs within Riverside County during a disaster or emergency. This system uses low frequency bands and has several back up channels in case of an outage. Additionally, the City has a portable disaster case radio system. This system allows communications with other agencies such as County Emergency Services, County Fire, County Police, Hospitals, Cities within Riverside County, Moreno Valley Unified School District and Valley View Unified School District.
MVU adheres to California Public Utility Commission GO 95, 128, 165, and 174 for all system infrastructure inspection, maintenance, and reporting.
City of Moreno Valley Office of Emergency Management maintains a city-wide Hazard Mitigation Plan identifying potential fire hazards and mitigation strategies.
City of Moreno Valley also maintains a reporting hotline for all employees to properly notify the city for code violations, hazards, safety concerns, and overgrown landscaping and weeds.
MVU is impacted by Southern California Edison (SCE) Public Safety Power Shutoff (PSPS) events. MVU receives advanced notification from SCE when impacted circuits are being monitored against weather projections for a potential PSPS A.16.a
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7 event. SCE provides the names of circuits being monitored as well as the impacted City accounts, along with the projected period of concern for the PSPS event. As the situation develops, MVU receives updated data from SCE on weather, circuits and accounts being monitored, and if a PSPS is triggered. MVU monitors the SCE status reports and stages mitigation assets appropriately in advance of a SCE triggered PSPS event. If the PSPS event affects any MVU facilities, MVU customers are notified as early as possible of pending power shutoffs.
When a SCE PSPS event is triggered that impacts MVU facilities, MVU notifies its customers of potential service interruption in a variety of ways. Alert notices are pushed out to customers via the MyMVU mobile application, email blasts, direct telephone communication with critical customers, as well as public messaging available on the MVU web site and through MVU’s 24/7 call center. PSPS and outage notices will be translated into Spanish for non-English speakers in the future.
With all of MVU's distribution lines undergrounded, the utility does not de-energize its system during severe weather events. In the event MVU is impacted by an SCE PSPS, MVU does have backup generation assets to keep critical infrastructure operational, including a portable back-up generator that can be distributed to impacted MVU customers.
D. Standardized Emergency Management System
As a local governmental agency,1 MVU has planning, communication, and coordination obligations pursuant to the California Office of Emergency Services’ Standardized Emergency Management System (“SEMS”) Regulations,2 adopted in accordance with Government Code section 8607. The SEMS Regulations specify roles, responsibilities, and structures of communications at five different levels: field response, local government, operational area, regional, and state.3 Pursuant to this structure, MVU annually coordinates and communicates with the relevant safety agencies as well as other relevant local and state agencies. When activated, MVU serves as the Utilities Unit Leader under the Operations Section Chief as part of the City of Moreno Valley’s Emergency Operations Center. In the event that the incident centered on MVU facilities, MVU would serve as the Operations Section Chief.
Under the SEMS structure, a significant amount of preparation is done through advanced planning at the county level, including the coordination of effort of public, private, and nonprofit organizations. Riverside County serves as the Operational Area and is guided by the California Office of Emergency Services, Southern Region. The Operational Area includes local and regional organizations that bring relevant expertise to the wildfire prevention and recovery planning process. These participants include:
1 As defined in Cal. Gov. Code § 8680.2.
2 19 CCR § 2407.
3 Cal. Gov. Code § 2403(b):
1) “Field response level” commands emergency response personnel and resources to carry out tactical decisions and activities in direct response to an incident or threat.
2) “Local government level” manages and coordinates the overall emergency response and recovery activities within their jurisdiction.
3) “Operational area level” manages and/or coordinates information, resources, and priorities among local governments within the operational area and serves as the coordination and communication link between the local government level and the regional level.
4) “Regional level” manages and coordinates information and resources among operational areas within the mutual aid reg ion designated pursuant to Government Code §8600 and between the operational areas and the state level. This level along with the state level coordinates overall state agency support for emergency response activities. 5) “State level” manages state resources in response to the emergency needs of the other levels, manages and coordinates mutual aid among the mutual aid regions and between the regional level and state level, and serves as the coordination and communication link with the federal disaster response system.
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8 Agency/ Dept. Mailing Address Contact Phone Fax
AMR American Medical
Response
879 Marlborough Ave.
Riverside, CA. 92507
951.782.5234 951.782.5617
AMR American Medical
Response
879 Marlborough Ave.
Riverside, CA. 92507
Dispatch 877.267.6622 951.782.5605
Kaiser Permanente: Medical
Center
12815 Heacock
Moreno Valley, CA. 92552
Administration 951.601.6327 951.601.6181
Kaiser Foundation Moreno
Valley: Community Hospital
27300 Iris Ave.
Moreno Valley, CA. 92555
Facilities Services Manager 951.251.6594 951.251.6601
Moreno Valley Fire/Office of
Emergency Management
14177 Frederic St.
Moreno Valley, CA 92553
Emergency Management Program
Manager
951.413.3800 951-413-3801
Moreno Valley: Special
Districts
14331 Frederick Street
Moreno Valley, CA 92253
Division Manager 951.413.3480
Moreno Valley: Fire Dept. 14177 Frederick Street
Moreno Valley, CA. 92553
Fire Marshal 951.413.3370
Moreno Valley: Fire Dept. 22850 Calle San Juan De Los Lagos Moreno Valley, CA 92553
Fire Chief 951.486.6780 951.486.6790
Moreno Valley: Operations &
Maintenance
14177 Frederick Street
Moreno Valley, CA. 92553
Manager 951.413.3160 951.413.3141
Moreno Valley: Police Dept. 22850 San Juan De Los Lagos Moreno Valley, CA. 92552
Police Chief 951.486.6700
Moreno Valley: Public Works 14177 Frederick Street
Moreno Valley, CA. 92553
Public Works Director 951.413.3100 951.413.3141
Moreno Valley Traffic &
Transportation
14177 Frederick Street
Moreno Valley, CA. 92553
City Traffic Engineer 951.413.3140 951.413.3140
Moreno Valley: City
Management
14177 Frederick Street
Moreno Valley, CA. 92553
City Manager 951.413.3020
Moreno Valley: Facilities
Management
14177 Frederick Street
Moreno Valley, CA. 92553
Division Manager 951.413.3740
Moreno Valley: TV3 14177 Frederick Street
Moreno Valley, CA. 92553
Media & Production
Supervisor
951.413.3056 951.413.3053
Moreno Valley: Unified School
District
25634 Alessandro Blvd.
Moreno Valley, CA. 92553
Maintenance Supervisor 951.571.7865 951.571.7811
Riverside Medical Clinic:
Canyon Springs Plaza
6405 Day Street
Moreno Valley, CA. 92552
Facilities 951.321.6331 951.248.6703
Riverside County:
Dept. of Environmental Health
4065 County Circle
Riverside, CA.
Deputy Director 951.358.5172 951.358.5017
Riverside County: Dept. of
Environmental Health
4065 County Circle
Riverside, CA.
Supervising Environmental Health
Specialist
951.358.5172 951.358.5017
Riverside County: Dept. of
Environmental Health
800 S. Sanderson Ave. #200
Hemet, CA. 92545
Supervising Environmental Health
Specialist
951.766.2824
Riverside County: Dept. of
Environmental Health
800 S. Sanderson Ave. #200
Hemet, CA. 92545
Supervising Environmental Health
Specialist
951.766.2824
Riverside Regional: Medical
Center
26520 Cactus Ave.
Moreno Valley, CA. 92552
Deputy Director 951.955.4878 951.955.8405
Riverside Regional: Medical
Center
26520 Cactus Ave.
Moreno Valley, CA. 92555
Chief of Hospital Plant Op. 951.486.4066 951.486.4105
Val Verde: Unified School
District
975 W. Morgan Street
Perris, CA. 92581
Emergency Services 951.940.6100
ext. 10672
951.940.6118
Val Verde: Unified School
District - March Middle School
15800 Indian Ave Director of Facilities, Maintenance, & Purchasing
951.940.6136
ext. 10652
Verizon Public Relations Director of Public Relations (213) 800-3184 Eastern Municipal Water
District
Central Control 2270 Trumble Road
Perris, CA 92572-8300
951.928.3777
ext. 6265
951.928.6170
Davita Canyon Springs
Dialysis
22555 Alessandro Blvd Bldg. 5 951.653.6400
Kaiser Permanente 27200 Iris Ave Medical Bldg. 951.353.4359 United States Postal Services 23800 Cactus Ave Facility Manager 951.697.4661 Waste Management 17700 Indian St Fleet Manager - Fleet Maintenance 951.601.1129 951.339.6681
Pu
rsuant to the SEMS structure, MVU participates in annual training exercises. Training exercises include workshops, tabletop exercises, and field drills. A sample of topics covered include; earthquake safety, disaster response & management, active shooter, crisis leadership, and NIMS/SEMS/ICS compliance.
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9 MVU is a member of the California Utility Emergency Association, which plays a key role in ensuring communications between utilities during emergencies and provides mutual aid. MVU also participates in the American Public Power Association Mutual Assistance Agreement, which covers public utilities across the United States. The City of Moreno Valley is a participant in the California Disaster and Civil Defense Mutual Aid Agreement which allocates state resources to cope with any type of disaster.
V. Wildfire Risks and Drivers Associated with Design, Construction, Operation, and Maintenance
A. Particular Risks and Risk Drivers Associated with Topographic and Climatological Risk Factors
Due to MVU’s distribution system being 100% underground, there is limited risk specific to wildfires. As an undergrounded utility, MVU does not monitor prevailing wind speed or direction. Weather intelligence monitoring assets have not been installed on the MVU distribution system due to the associated costs and limited benefit the utility would gain from collecting such data.
B. Enterprise-wide Safety Risks
The safety risks discussed below apply to the City of Moreno Valley as a municipal jurisdiction and include both Moreno Valley Utility and Southern California Edison service territories.
Earthquake profile - There are three major faults/fault zones that directly affect Moreno Valley. They are the southern section of the San Andreas Fault, the San Jacinto Fault Zone, and the Elsinore Fault Zone. The San Jacinto Fault Zone is considered to be the most active fault in Southern California. It is the closest fault to Moreno Valley and runs through the eastern portion of the city, followed by the Elsinore Fault Zone which is located approximately 12-18 miles south of Moreno Valley. The San Andreas Fault Zone is located approximately 15-20 miles north of Moreno Valley The largest earthquake to occur within 100 miles of Moreno Valley was the 7.4 magnitude Hector Mine earthquake in 1999.
The City of Moreno Valley could be affected by large earthquakes occurring in many parts of the Southern California region. However, the degree to which the earthquakes are felt, and the damages associated with them may vary. At risk from earthquake damage are critical facilities, buildings, bridges, highways and roads; hazardous materials facilities; sewer, water, and natural gas pipelines; earth dams; petroleum pipelines; and private property located in the city. The relative or secondary earthquake hazards, which are liquefaction, ground shaking, amplification, and earthquake- induced landslides, can be just as devastating as the earthquake. The USGS estimates that there is a greater than 99% chance of a major earthquake occurring within 31 miles of Moreno Valley within the next 50 years.
Flooding profile - There are four types flooding conditions that exist within the Moreno Valley area: flooding in defined watercourses; ponding; sheet flow; and dam inundation. Flooding within defined watercourses occurs within drainage channels and immediately adjacent floodplains. Ponding occurs when water flow is obstructed due to manmade obstacles such as the embankments of SR-60 and other roadways, where they cross-defined watercourses. Sheet flow occurs when capacities of defined watercourses are exceeded and water flows over broad areas.
Known flood-prone areas as noted in the General Plan as well as recorded in city maintenance files, include: