HomeMy WebLinkAboutSS4 - FEMA Study and Floor Rates - PowerPointCITY COUNCIL STUDY SESSION
FEMA OPEN PACIFIC COAST
STUDY UPDATE
April 11, 2017
Item No. SS4
o, Background:
► FEMA - Open Pacific Coast Study for I% chance annual flooding.
• Mapping project to produce new Flood Insurance Rate Maps (FIRM) for the National
Flood Insurance Proqram (NFIP)
• Still water levels from tide peaks at 7.88 ft. for the Newport Harbor
• Total water levels and Wave overtopping for coastal flooding from Pacific open coast.
WAVES ORIGINATE FROM:
1) WIND DRIVEN WAVES AND
2) OCEAN SWELLS TRAVELLING FROM
STORMS
►National Flood Insurance Program
• NFIP is voluntary and Newport Beach currently
participates along with approx. 550 other communities in
California.
• NFIP provides federally backed affordable flood
insurance to ALL participants.
• Compliance with NFIP requires the City to regulate
development in the special hazard flood zones. Do
build below the flood line. /
National Flood Insurance Program
Home owners insurance does not cover storm flood
damage.
® Federal law requires flood insurance for federally backed
loans ( Conforming - Fannie Mae or Freddie Mac) . Jumbo
Loans Too.
Mortgage refinance would trigger the requirement for floo
insurance. /
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►Staff engaged with Everest International Consulting
Inc. to conduct an in-depth analysis of FEMA's
assumptions.
►The Everest study focused on two distinct
components:
o. 1) Newport Harbor
►2) Coast Line
EARLY CONCLUSIONS
►FEMA did not take into account the height of
our seawalls.
►FEMA did not use Hydrodynamic modeling to
calculate flood elevation. They only compare
the elevation of grade to water level. 1.4
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PROPOSED FEMA FLOOD INSURANCE RATE MAPS
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Updated Analysis
Open coastline study
/Ocean front Properties
The following was evaluated:
i. Established an average beach profile at 200
foot intervals vs. FEMA's one non -representative
beach profile.
2. Modeled Berming as a select "backshore"
feature that are created in advance of large
ocean swells (City's Existing Practice)
EVEREST INTERNATIONAL STUDY
FEMA Proposed FIRM
Conclusion:
i. Newport Harbor: FEMA study use of "bathtub
methodology" over predicts flooding extent.
2. Open Coast: Consideration of Average Slope Transec
and Berming will improve the wave crest line.
Berm Location is more critical than its height.
EVEREST INTERNATIONAL STUDY
Next Steps.
Send FEMA all of the latest analysis and seawall height
elevations, during this public comment stage for their
review.
Requesting FEMA to update their maps to reflect our
analysis.
Expect to hear back from them in the next 45/- 60 days.
Risks:
► More of Balboa Peninsula will be located in a
designated flood zone, requiring flood insurance.
► Coastal properties will be required to be built above
the wave height, ranging from 4 feet to 13 feet above
grade.
REFERENCE INFORMATION
► www.smartflood.aov
► httg://arca.is/ l 06fejt
Flood Insurance
Pacific Coast Study
► Ying Poon, Everest Inc. City Consultant
► Samir Ghosn - City Staff / Project Manager
► Seimone Jurjis City Staff
► Phone : (949) 644-3200
sghosn@newporbeachca.gov
sjurjis@newportbeachca.gov
QUESTIONS?