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HomeMy WebLinkAboutPW FEMA Flood Maps Implementation Report PPTIMPLIMENTATION PROGRESS OF THE NEW r FEDERAL EMERGENCY MANAGEMENT AGENCY, FLOOD MAPSs 'z F r , Introductions Federal Emergency Management Agency r Kathy Schaefer (Region IX — Regional Engineer) San Rafael Public Works Department Nader Mansourian Kevin McGowan P� !} `r .�- ? �. i4 as a.y. � 1 �t� a ,� ,� a .� �.,� � � `_ tri � i a Lir' � � � _ � s � �� t� � t;�Y 1 i T( � � Y L� � ' � ( ayi �h� xtc� "G�� T'"" .c a. x � �F 1 ° s > 1 r at,k,�1't �mo/i' ' �h � .. Y' '+�„4'k: t fY �� i jk s " � ra,1- t�� 1 1 '.i;,� 15' 4 i `� �..i': y� ] $'f t A '� f f 1 � '{j9i k` �„ '" � .�� � �`� ` to 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? T -AM 14 R z -ate u i i How is it possible that my home could be in danger? II P Six CSS= !s � � z Hydrostatic Farces Q. SEAL.D i SIGNATURE e(li1 GRPDE LOWEST GRADE 0 Es, NEXT TO BUILDING L olAc T ZO PDIP GHER gull -V I*E BFE yk. �4 (pY h. F0M�A- A Nq AT I', ROUND UR IS,B0 EI"G SITE NotREQUJRED _. "oOD INSUPyN� % Coastal Study Process I is Dzata,AO.q.uisitipn 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 } 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 { — Nearshore bathymetry — Wave dynam cs v — Land use and development Coastal Study Process Analyzing Runup and Overtopping C s 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 t 1 ._ W.' AA AN- s CITIZENS WANT TO HEAR ABOUT THEIR FLOOD'FRISK�. 4 FROMar�� P ++Y`r 24'4 ry { f <. ":I we��.`. What you tell your constituents_ THE SCIENCE IS SOUND AND THE RIS IS REAL i WE WANT EVERYONE TO KNO,IU�ABOCTj THEIR FLOOD RISK . k 24 Vd WE WANT TO ENCOURAGEURRr enz} TO TAKE ACTION • [K E f ', b'7 M�''7i S v 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 �ll ELEVATION 10 I _ 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`� , �' ,_ r 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] 14 � s , _04~.459~ 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 { yy �. a 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 Y P, t ±, � � M 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 $ 4 � Y t Y 7-A ., ,..