HomeMy WebLinkAboutPW FEMA Flood Maps Implementation Report PPTIMPLIMENTATION
PROGRESS OF THE NEW r
FEDERAL EMERGENCY
MANAGEMENT AGENCY,
FLOOD MAPSs 'z
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Introductions
Federal Emergency Management Agency
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Kathy Schaefer
(Region IX — Regional Engineer)
San Rafael Public Works Department
Nader Mansourian
Kevin McGowan
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I Francisco I Coastal
Rnnoma
San Francisco Bay Coastal Study Timeline
1.Public
Review Period (90 Days)
a. Starts in April 2014
b. Ends in August 2014
c. Public comments and rnodificeitions based ori
provided data will be considered by FEMA
assist with notifying Residents]
2.
FEMA review 'of Comments
't
Approximately 4 months
3.
FEMA issues Letter of Map Determman
Estimated to be January 2016
4.6
months until the maps take -;affect
Estimated to be..June 2015
How is it possible that my home could be in
danger?
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How is it possible that my home could be in
danger?
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"oOD INSUPyN� %
Coastal Study Process
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Coastal Study Process
Regiona Mode',H,69 Key
Terminology°
Surge: Tidal water levels
® Seas: Local wind -generated.'
aves
® Swell: Long period waves originating from Pacifrc.Qcean
storms that enter SF Bay through. Golden Q.ate,
Bay -Wide Regional Modeling
One -D Modeling, Key
Coastal Study Process
Special Study Cblnsf&ratibn�;�,,,,
■ Sheltered water body
Complex geometry '
— Variable shoreline charaoiensiicsd
— Dense development
® Seas and swell waves
— Bom of different forcing,
— Temporal variability Lr�-x
— Spatial variability
Directional variability'''
■ Non-lainc dent. eaks in
water levels and'wa.ves .
vertical
r."
wall
® Natural
Shoreline
— Revetment
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Coastal Study Process
Overland Coastal Hazard
Analy��:.
j Transect -based analysis w, .
Transect locations and -
�LL
density based on: f
— Shoreline characteristics;; j
— Shoreline direction
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— Nearshore bathymetry
— Wave dynam cs v
— Land use and development
Coastal Study Process
Analyzing Runup and
Overtopping
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Analyzing Runup and
Overtopping
The primary coastal flood hazards for Marin County are
• wave runup,
• overtopping,
• overland wave propagation and,
• inundation from elevated stillwater levels O�``°�ee
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CITIZENS WANT TO HEAR
ABOUT THEIR FLOOD'FRISK�.
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What you tell your constituents_
THE SCIENCE IS SOUND AND THE RIS
IS REAL
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WE WANT EVERYONE TO KNO,IU�ABOCTj
THEIR FLOOD RISK .
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WE WANT TO ENCOURAGEURRr enz}
TO TAKE ACTION
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San Francisco Bay Coastal Study
and
San; Rafael:
Base Flood Elevation changed from 9iO to 10.0 NAVD
IF BERM/LEVEE IS APPROVED AS A
FLOOD BARRIER THAN THE
STRUCTURE IS NOT IN THE SPECIAL uii
- FL00D HAZARD AREA
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ELEVATION 10
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_
FLOOD LINE ABOVE LIVABLE FLOOR
(2014 BASE FLOOD ELEVATION)
I
ELEVATION 9
FLOOD LINE BELOW LIVABLE SPACE
(2009 BASE FLOOD ELEVATION)
`.Coastal .
Open Pacific Coastal Study
Public Review Period to follow the completion of the San
Francisco Bay Coastal Study (June 2015)
90 day appeal period and review by FEMAwith`estir-
Letter of Map Determination in 2016,`''
Should be minimal impact to innbreglontb
dsutthere�(s
y
a potential for minor changes,K
NMI
Additional options available to the
City of San Rafael (DPW) �
Community Rating System
Public Information
Mapping, i.n and. Reations
� � ..g.M
Flood Damage Reductron,`E
511 1,Y4,
1. Administered by,1 he Cit ia�pt o;� �MA`� ,
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2 Potential reduction 4mover Fe serape t*
to 45%. t
3. Incremental, system rn wh�cf� reductio l are' chute: ed A
over, time.,
Infrastructure Feasibility Study
Current Flood Control Infrastructure [Base Flood Elev. Reduction]
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Next Steps
Flood Maps
1. Examine the proposed changes and provide,comments
to FEMA in Compliance with the San Francisco Bay
Coastal Study ;
2. Notify affectedproperty, owners of proposed, changes to
the Flood. Insurance Rate Maps.withi6 San Ra#ael
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Next Steps
Community Rating System (CRS) r
1. DPW/Fire develop and submit the City'sH,azard
Mitigation. Plan to FEMA
2. Establish the cost and complexities associated
with initiating the CRSprogram for San' Rafalw
3. Report back to the Council h May 201
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Next Steps
Infrastructure Study
1. Seek assistance from qualified consultants. to review areas within
San Rafael that are protected by, current infrastructure to determine.,
what is needed to amend the current flood hazard area ,
designation.
2. Report back to the Council in May 2Q lid" .. a
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