HomeMy WebLinkAbout20190409_Coastal_Hazards_Analysis_Report_Revised_on_03-27-19
P M A C O N S U L T I N G , I N C .
CONSULTING STRUCTURAL ENGINEERS
28161 Casitas Ct. PH. (714) 717-7542
Laguna Niguel, CA 92677
e-mail: p.petrov@pma-bg.com
March 27, 2019
Scott Hudgins, Architect
Hudgins Design Group, Inc.
1107 South Coast HWY
Laguna Beach, CA 92651
RE: COASTAL HAZARDS ANALYSIS REPORT FOR COASTAL
DEVELOPMENT PERMIT
Milan Panic; Applicant
2104 East Balboa Boulevard
City of Newport Beach, County of Orange
PMA Job #24818
Dear Mr. Hudgins,
PMA Consulting, Inc. is pleased to provide this report regarding Coastal Hazards Analysis for
the proposed development at the subject site. The site is adjacent to Newport Bay, thus it may be
subject to Coastal Hazards such as, flooding, wave runup, and erosion. This study investigates the
potential for the aforementioned hazards to impact the proposed development on the site over the next
75 years and addresses compliance with Coastal Hazards Analysis Report requirements and standards
of NBMC Section 21.30.15.E.2.
STATEMENT OF THE PREPARER’S QUALIFICATIONS
Plamen Petrov, P.E., the preparer of the Coastal Hazards Analysis Report on this project,
holds a Master of Science in Structural Engineering from University of Architecture, Structural
Engineering & Geodesy of Sofia, Bulgaria, and is a Licensed Civil Engineer by the State of
California Certificate No. C66947. For the last 19 years of his professional career he has been
actively involved in the design and entitlement of many Waterfront Developments such as custom
homes, seawalls, piers, platforms, floating docks and marinas. A great number of Coastal Hazards
Analysis Reports prepared by him have been reviewed and accepted/approved by California Coastal
Commission.
All the above being said, Plamen Petrov, P.E. shall be considered a qualified preparer for the
Coastal Hazards Analysis Report on this project.
Requirements in Appendix A for Step 1:
Establish the project sea level rise range for the proposed project’s planning horizon
(life of project) using the current best available science.
The State of California Sea-Level Rise Guidance 2018 update developed by the Ocean
Protection Council in close coordination with Policy Advisory Committee with representation
from California Natural Resources Agency, the Governor’s Office of Planning and Research, and the
California Energy Commission provides a bold, science-based methodology for state and local
governments to analyze and assess the risks associated with sea-level rise, and to incorporate Sea-
Level Rise into their planning, permitting, and investment decisions, and it is considered the
current best available science.
As reflected in the clouded area of the enclosed Table 28, based upon direct interpolation
of the data for High emissions 2090 & 2100 and Low Rick Aversion, over the project’s planning
horizon of 75 years, the estimated Sea-Level Rise for year 2094 shall be 2.90’, which is the Sea-
Level Rise for the proposed project. Based on the highest high tide of +7.88’MLLW
(7.70’NAVD88) recorded in the project area, the above established Sea-Level Rise will account
for bay water level of +10.60’NAVD88.
Requirements in Appendix A for Step 2:
Determine how physical impacts from sea level rise may constrain the project site,
including erosion, structural and geologic stability, flooding, and inundation.
According to the attached Site Plan A 101, finished 1st floor elevation of the proposed
development is at +11.00’ NAVD88=+11.18’MLLW which is higher than the Base Flood
Elevation established for the area. The highest high tide reached in Newport Beach of +7.88’
MLLW is approximately 3.3’ below finished 1st floor elevation of the proposed structure and
will remain below it until after year of 2094. As we well know, majority of the public streets in
Newport Bay area are currently at much lower elevations than the subject site and they will
flood due to Sea Level Rise way before the development on this site becomes subject to flooding.
FLOODING HAZARD
The primary hazard due to flooding from the ocean waters for this site, like majority of the
sites located adjacent to Newport Bay, would be due to long term Sea-Level Rise. The current water
levels in Newport Bay are reflected on the enclosed Datums for Newport Bay Entrance.
According to the enclosed seawall DWGS SW-0 thru SW-2, top of the proposed Concrete
Stem Wall on top of the Concrete Coping shall be at +10.60’ NAVD88 which equals +10.78’
MLLW and follows the current City of Newport Beach Waterfront Projects Guidelines and
Standards.
While Sea-Levels have been Rising for decades, higher rates of raise are forecast for the
coming century because of climate change – see enclosed table 28. Increases can be attributed to
warmer temperatures, which cause water to expand, as well more liquid mass caused by melting of
ice caps. Current estimates of future Sea-Level Rise generally fall in the range of 1-3 ft for the year
2100. Global warming may impact flooding in other ways as well. Warmer water could intensify
North Pacific storms, bringing greater wind and wave energy to shoreline in winter and higher
intensity precipitation.
The Newport Beach Peninsula portion of the Pacific Institute California Flood Risk Map is
shown herein as OE S Quadrangle. The dark blue colored areas show the areas where a 100-year Sea-
Level Rise of 55 inches is added to the existing FEMA coastal flood elevation shown in light blue.
Obviously, the entire Newport Bay area will be affected if sea level rises 55 inches by the year 2100.
If the sea level rises in the next several decades as currently estimated, regional measures
to mitigate the potential flooding hazard shall be taken. Since finished 1st floor elevation of the
proposed house will be at +11.00’ NAVD88, it will remain below the High Tide until after year
2094.
WAVE RUNUP
Wave runup is the uprush of water from wave action on a shore barrier intercepting Stillwater
level. On steeply sloped shorelines, the rush of water up the surface of the natural beach, including
dunes and bluffs, or the surface of a manmade structure, such as revetment or vertical
wall can result in flood elevations higher than those of the crest of wind-driven waves. See wave
Runup Sketch below.
Due to its location, this site is not a subject to typical ocean waves and the associated wave
runup. Bay generated waves that may arrive at this site are very small wind waves and boat wakes.
These types of waves are generally dampened by the moored vessels and dock systems located in
front of the site and have no significant energy and runup effect. Tsunami type waves that approach
from the ocean shoreline will likely not reach the site for several reasons. There is no significant near
field source of a tsunami like the geologic conditions of some other places on Earth such as Japan, for
example. A far field tsunami reaching the ocean shoreline will likely not reach the site because of the
distance and developments between the shoreline and this site. A near or far field tsunami
propagating into Newport Bay proper would likely cause a seiche or standing wave on the order of
1.3 feet traveling within the bay. Even at the highest anticipated tide in Newport Beach of
+7.88’MLLW this shall not result in overtopping of the bulkhead/seawall. Due to its very infrequent
occurrence – 500-year recurrence interval – tsunami should not be considered a significant
impact over the life of the proposed structure -75 years.
EROSION HAZARD
Erosion refers to the wearing or washing away of coastal lands. Beach erosion is a chronic
problem along many open ocean shores of the United States. To meet the needs for comprehensive
analysis of shoreline movement, the United States Geological Survey has conducted analysis of
historical shoreline changes along open ocean sandy shores of the conterminous United States and
has produced an Open-File Report 2006-1219 entitled “National Assessment of Shoreline Change
Part 3: Historical Shoreline Change and Associated Coastal land Loss Along Sandy Shorelines of the
California Coast”. The report looks at survey data of the following periods: 1800s, 1920s-1930s, and
1950s-1970s, whereas the lidar shoreline is from 1998-2002. The report looks at both long-term and
short-term changes. According to the report, the average rate of long-term shoreline change for the
State of California was 0.2±0.1 m/yr., and accretional trend. The average rate of short-term shoreline
change for the state was erosional; with an average rate of -0.2±0.4 m/yr. The beach footprint of this
site is stabilized and not subject to significant long-term erosion. Review and analysis of historical
aerial photographs and field measurements for seawall repairs in the area show no change in the
position of the shoreline over the last several decades. The future shoreline changes over the next 75
years are assumed to be the same as in the previous several decades. However, there is a rapid rate
of Sea-Level Rise predicted in the next 75 years. If that prediction holds true, the rapid Sea-
Level Rise may accelerate shoreline erosion, but it shall not impact the structure on the subject
lot over its economic life.
CONCLUSION
In conclusion, flooding, wave runup and erosion will not significantly impact this
property over the proposed life of the development. Once the existing seawall/bulkhead is
repaired/reinforced in compliance with the enclosed preliminary drawings SW-0 thru SW-2,
need for a new shoreline protective devise is not anticipated over the economic life of the
proposed development to protect it from flooding, wave runup or erosion. If found not
adequate for the actual sea level rise over the next 75 years, the bulkhead assembly allows to be
increased in height per the enclosed STD-601-L without further seaward encroachment. If
during this period the seawall displays any sign of distress that requires immediate attention, it
should be repaired or replaced at that time accordingly, without seaward encroachment from
its current location.
The above conclusion was prepared based on the existing conditions, proposed drawings,
current projection of future Sea-Level Rise, and within the inherent limitations of this study, in
accordance with generally acceptable engineering principles and practices. We make no further
warranty, either expressed or implied.
PMA Consulting, Inc. appreciates the opportunity to work with you towards the successful
completion of your project. Should you have any questions regarding this report, please contact us.
Respectfully submitted,
Plamen Petrov, P.E.
Principal
Enclosures:
Location Map
Aerial View
Topographic Survey
Architectural Lower Level Floor Plan A 101
Table 28: Projected Sea-Level Rise (in feet) for Los Angeles
Datums for Newport Bay Entrance
City of Newport Beach – STD-601-L
Newport Beach OE S Quadrangle
Seawall Drawings SW-0 thru SW-2
BENCHMARK NOTE:OCSBM NB1-4-71ELEV=7.828NAVD88 DATUM, 2015 ADJ.EASEMENT NOTE:THE PLAT FOR THIS SURVEY WAS PREPARED WITHOUT A TITLE REPORT.UNPLOTTED EASEMENTS MAY EXIST ON THE SUBJECT PROPERTY.JOB NO.SHEETOFPREPARED FOR:APVD. DATER E V I S I O N SBY DATEAPPD.:DATE:DWG. NO.H. SCALE:V. SCALE:SURVEY DATE:CHD.:DRN.:VIKTOR P.MEUMNo. 86821"=10'-6-12-187-2-18MCHMSFVM1811311TP-01PROPERTY LEGALPROPERY ADDRESSTOPOGRAPHIC SURVEYBOUNDARY NOTE:SCALE: 1"=10'
T.C.9.419.469.52 T.C.9.82 T.C.9.78 T.C.9.499.56 T.C.9.55 T.C.9.99 T.C.9.499.499.99 T.C.9.54 T.C.9.55 T.C.9.449.719.9910.0810.089.989.8510.010.310.310.3610.2010.1610.1110.0610.0210.3510.310.110.1710.410.710.910.7010.4910.4510.411.010.811.912.111.411.812.1814.017.514.011.811.210.910.811.010.711.810.99.38.38.311.510.19.28.67.9Water valveFire hydrantWater meter4" OutletWater meterCable box10"12"12"12"12"10"4" Drain12"12"12"12"10"12"14"12"12"12"Electric boxSewer cleanout12"Thick hedgecovering wallFd. tag LS2528Fd. tag LS541116.46 T.W.12.94 T.W.16.37 T.W.19.62 T.W.16.43 T.W.17.27 T.W.15.88 T.W.33.45 Roof ridge16.48 T.W.12.11 T.W.16.47 T.W.12.92 T.W.12.14 T.W.17.62 T.W.17.59 T.W.33.19 Roof ridge37.13 Roof ridge16.52 T.W.12.26 Threshold16.55 T.W.16.53 T.W.13.57 T.W.13.49 T.W.12.92 T.W.8.55 T.W.8.54 T.W.8.54 T.W.12.82 T.W.11.26 T.W.11.27 T.W.12.62 T.W.8.42 Deck22.97 Deck33AABBCCDDEEFFGG55442211NEW RESIDENTIAL BUILDINGBASEMENT LEVEL: -1.00' F.F.LEVEL 1: 11.00' F.F.LEVEL 2: 21.50' F.F.LEVEL 3: 35.00' F.FROOF LEVEL: 41.00 T.R2%SLOPE1152%SLOPE2%SLOPE1112245131110872422AVG. 254' - 10"A VG. 53' - 7 1/2"271011214961718161620213 % REFER TO CIVIL4921914191425261623+10.92+10.75+10.83+10.92+10.92+10.92+10.77+10.77+10.83+10.83+10.83+10.83+10.83+8.42+9.92+10.92+9.67+10.29+10.92+10.67+8.83+8.92+1.50-1.04+10.83N 19°35'47" E 248.73'N 9 0 °0 0 '0 0 " W 3 5 .0 1 'N 10°42'25" E 261.07'R 955.40' 04°24'03" L = 73.38'
SYSB
4' - 0"SYSB4' - 0"FYSB30' - 0"DRIVEWAY21' - 3"4' - 5"7' - 9 1/2"29' - 3"75' - 5"47' - 1" 22' - 5 1/2" 54' - 1 1/2"29' - 7 1/2"29' - 7 1/2"47' - 7 1/2"43' - 10" 1' - 5" 22' - 5 1/2" 1' - 1 1/2" 23' - 6" 6' - 0" 23' - 6"17' - 6"199' - 1"32' - 2"44' - 4 1/2" 21' - 11 1/2" 23' - 5" 5' - 7 1/2" 16' - 3 1/2" 2' - 10" 6' - 9 1/2" 4' - 9" 43' - 7" 6' - 0" 23' - 6"4' - 6"59' - 9 1/2"9' - 0"2' - 8"45' - 10"11' - 3 1/2"4' - 6"25' - 0"3' - 5 1/2"+1 0 .2 4
+1 0 .9 2
+1 0 .5 0
+1 0 .2 2 +10.37SCALE:PLOT DATE:laguna beach, ca, 92651949.322.79221107 south coast hwyhudgins design group, inc.info@hudginsdesign.comSHEET NUMBER:1/8" = 1'-0"SITE PLANP A N I û R E S I D E N C E18-1214A1012104 EAST BALBOA BLVD. NEWPORT BEACH, CA 92657PROJECT NORTHTRUENORTH38 FIRE RATED GLASS 'FIRELITE' BY IGU39 CAR ELEVATOR40 CAR TURNTABLE41 MINIMUM ½" GYP BOARD IS REQUIRED BETWEENDWELLING WALL AND A GARAGE, GARAGE CEILING TOBE 5/8" TYPE X IF HABITABLE OR SLEEPING ROOMSARE ABOVE (SEC. R302.6) SEPARATION TO EXTENDFROM FLOOR TO ROOF SHEATHING42 STRUCTURAL COLUMN / BEAM PER STRUCTURAL43 ROOF RIDGE44 ROOF CRICKET, BUILT-UP AS REQUIRED45 ROOF DRAIN W/ OVERFLOW AND CONCEALED PIPESPER CPC TABLES 11-1 AND 11-246 DECK DRAIN W/ OVERFLOW AND CONCEALED PIPES47 NOT USED48 EDGE OF WALL (ABV./BLW. AS OCCURS)49 EDGE OF ROOF / FLOOR (ABV./BLW. AS OCCURS)50 SHOWER W/ HOT MOPPED PAN RECESSED 4" BELOWADJ. F.F W/ FLOOR TO CEILING TILE PER OWNER51 SINK52 WASHER / DRYER BY OWNER PROVIDE CLOTHESDRYER MOISTURE EXHAUST DUCT. MIN. 4” DIA. TO THEOUTSIDE, EQUIPPED WITH A BACK-DRAFT DAMPER.DUCT LENGTH IS LIMITED TO 14’ WITH 2 ELBOWS. SEEMEP SHEETS53 CASEWORK54 STAIRS W/ MAXIMUM RISER HEIGHT SHALL BE 7-3/4"AND A MINIMUM OF 4". MINIMUM TREAD DEPTH SHALLBE 10". PROVIDE ILLUMINATION LEVEL ON TREAD RUNSOF NOT LESS THAN 1 FOOT CANDLE (CBC 1205.4)55 SKYLIGHT (ABV/BLW/ BYD AS OCCURS, ICC-ES ESR2415 W/ AUTOMATIC BLACKOUT SHADES56 RECESSED CURTAIN/SHADE TRACK, MOTORIZED W/REMOTE57 INFRATECH DRY SAUNA, DESIGN PER OWNER58 SHOWER W/ HOT MOPPED PAN RECESSED 4" BELOWADJ. F.F W/ FLOOR TO CEILING TILE PER OWNER59 STEAM UNIT BY OWNER60 WINE STORAGE61 FLOOR DRAIN61 MINIMUM ½" GYP BOARD IS REQUIRED BETWEENDWELLING WALL AND A GARAGE, GARAGE CEILING TOBE 5/8" TYPE X IF HABITABLE OR SLEEPING ROOMSARE ABOVE (SEC. R302.6) SEPARATION TO EXTENDFROM FLOOR TO ROOF SHEATHING62 SECANT SHORING PILE63 INSULATION PER T24 ENERGY REPORT1 PROPERTY LINE2 BUILDING SETBACK / MAX HEIGHT 29'-0"3 ADDITIONAL THIRD FLOOR SETBACK4 BUILDING FOOTPRINT5 ADJACENT STRUCTURE6 (N) DRIVEWAY - SLOPE PER CIVIL7 (E) CURB / EDGE OF PAVEMENT8 CENTERLINE OF RIGHT OF WAY9 (E) SEA WALL TO REMAIN10 (E) DOCK TO REMAIN11 (E) SITE WALL TO REMAIN13 (N) SITE WALL - MAX 62" IN SYSB, 42" IN RYSB14 EXTERIOR STAIRS/STEPS - REF. CIVIL DRAWINGS15 SITE GATE, MAX 6'-0" ABV. F.S16 PLANTING / SOFTSCAPE - REFER TO LANDSCAPE17 HARDSCAPE18 REFLECTING POND W/ 12" DEEP STANDING WATER (18"MAX)19 OUTDOOR FIREPLACE / FIREPIT W/ DRAINAGE +18"A.F.F20 TRASH STORAGE LOCATION21 A/C EQUIPMENT, SCREENED W/ SOUND ATTENUATION22 PROPOSED MAIN SERVICE PANEL, 800 AMP MAX.(MAINTAIN 36" CLEAR FROM FACE OF PANEL TO ANYOBSTRUCTION) - VERIFY LOCATION W/. SO. CA. EDISONPROPOSED MAIN SERVICE PANEL, 800 AMP MAX.(MAINTAIN 36" CLEAR FROM FACE OF PANEL TO ANYOBSTRUCTION) - VERIFY LOCATION W/. SO. CA. EDISON23 PROPOSED GAS METER LOCATION24 (E) WATER METER LOCATION (REF CIVIL & SURVEYDWGS)(E) WATER METER LOCATION (REF CIVIL & SURVEYDWGS)25 POOL26 SPA27 POOL EQUIP. W/ SURROUNDING SCREEN WALL28 GUARDRAIL - MIN 42" ABV. ADJ FF.29 HANDRAIL 36" ABV. ADJ. FF30 OUTDOOR SHOWER, COLD WATER ONLY, NO DRAIN31 ELEVATOR 'SUPERMEC' BY ELEVATOR BOUTIQUE32 ELEVATOR - MACHINE CABINET AREA. PROVIDE ELEC.33 BBQ, PROVIDE GAS AND ELEC. PER OWNER34 WATER HEATER - TANK, VERIFY SIZE REQ'D. W/. MFGR.(PROVIDE WATER & GAS)35 FAU - PROVIDE GAS S/O,ELEC, VENTING PERMFGR.(CMC 904. 1)36 WATER FILTRATION SYSTEM37 GAS FIREPLACE - 'HEATNGLO' MEZZO 60 - ANSIZ21.88-2014/CSA 2.33-2014. TO BE DIRECT VENT, SEALCOMBUSTION TYPE.
Probabilistic Projections (in feet) (based on Kopp et al. 2014)
H++ scenario
(Sweet et al.
2017)
*Single
scenario
MEDIAN LIKELY RANGE 1-IN-20 CHANCE 1-IN-200 CHANCE
50% probability
sea-level rise meets
or exceeds…
66% probability
sea-level rise
is between…
5% probability
sea-level rise meets
or exceeds…
0.5% probability
sea-level rise meets
or exceeds…
Low
Risk
Aversion
Medium - High
Risk Aversion
Extreme
Risk Aversion
High emissions 2030
0.3 0.2 - 0.5 0.6 0.7 1.0
2040 0.5 0.4 - 0.7 0.9 1.2 1.7
2050 0.7 0.5 - 1.0 1.2 1.8 2.6
Low emissions 2060
0.8 0.5 - 1.1 1.4 2.2
High emissions 2060
1.0 0.7 - 1.3 1.7 2.5 3.7
Low emissions 2070
0.9 0.6 - 1.3 1.8 2.9
High emissions 2070
1.2 0.8 - 1.7 2.2 3.3 5.0
Low emissions 2080
1.0 0.6 - 1.6 2.1 3.6
High emissions 2080
1.5 1.0 - 2.2 2.8 4.3 6.4
Low emissions 2090
1.2 0.7 - 1.8 2.5 4.5
High emissions 2090
1.8 1.2 - 2.7 3.4 5.3 8.0
Low emissions 2100
1.3 0.7 - 2.1 3.0 5.4
High emissions 2100
2.2 1.3 - 3.2 4.1 6.7 9.9
Low emissions 2110*
1.4 0.9 - 2.2 3.1 6.0
High emissions 2110*
2.3 1.6 - 3.3 4.3 7.1 11.5
Low emissions 2120
1.5 0.9 - 2.5 3.6 7.1
High emissions 2120
2.7 1.8 - 3.8 5.0 8.3 13.8
Low emissions 2130
1.7 0.9 - 2.8 4.0 8.1
High emissions 2130
3.0 2.0 - 4.3 5.7 9.7 16.1
Low emissions 2140
1.8 0.9 - 3.0 4.5 9.2
High emissions 2140
3.3 2.2 - 4.9 6.5 11.1 18.7
Low emissions 2150
1.9 0.9 - 3.3 5.1 10.6
High emissions 2150
3.7 2.4 - 5.4 7.3 12.7 21.5
STATE OF CALIFORNIA SEA-LEVEL RISE GUIDANCE
APPENDIX 3: SEA-LEVEL RISE PROJECTIONS FOR ALL 12 TIDE GAUGES | 72
TABLE 28: Projected Sea-Level Rise (in feet) for Los Angeles
Probabilistic projections for the height of sea-level rise shown below, along with the
H++ scenario (depicted in blue in the far right column), as seen in the Rising Seas
Report. The H++ projection is a single scenario and does not have an associated
likelihood of occurrence as do the probabilistic projections. Probabilistic projections
are with respect to a baseline of the year 2000, or more specifically the average
relative sea level over 1991 - 2009. High emissions represents RCP 8.5; low emissions
represents RCP 2.6. Recommended projections for use in low, medium-high and
extreme risk aversion decisions are outlined in blue boxes below.
*Most of the available climate model experiments do not extend beyond 2100. The resulting
reduction in model availability causes a small dip in projections between 2100 and 2110, as well as
a shift in uncertainty estimates (see Kopp et al. 2014). Use of 2110 projections should be done with
caution and with acknowledgement of increased uncertainty around these projections.
Newport BeachNewport Beach
Costa MesaCosta MesaCosta MesaCosta MesaHuntington BeachHuntington Beach
¬«1
¬«55
¬«1
¬«55
117°52’30"W
117°52’30"W
117°55’0"W
117°55’0"W
117°57’30"W
117°57’30"W
118°0’0"W
118°0’0"W
33°37’30"N
33°37’30"N
33°35’0"N
33°35’0"N
33°32’30"N
33°32’30"N
33°30’0"N
33°30’0"N
407000mE
407000mE
08
08
09
09
410
410
11
11
12
12
13
13
14
14
15
15
16
16
17
17
18
18
419000mE
419000mE3707000mN 3707000mN08 08
09 09
3710 3710
11 11
12 12
13 13
14 14
15 15
16 16
17 17
18 18
19 19
3720 37203721000mN3721000mN
This information is being made available for informational purposes only. Users of this information
agree by their use to hold blameless the State of California, and its respective officers, employees,
agents, contractors, and subcontractors for any liability associated with its use in any form. This work
shall not be used to assess actual coastal hazards, insurance requirements, or property values
and specifically shall not be used in lieu of Flood Insurance Studies and Flood Insurance Rate Maps
issued by the Federal Emergency Management Agency (FEMA).
Data Sources: US Geological Survey, Department of Commerce (DOC), National Oceanic and Atmospheric
Administration (NOAA), National Ocean Service (NOS), Coastal ServicesCenter (CSC), Scripps Institution
of Oceanography, Phillip WIlliams and Associates, Inc. (PWA), US Department of Agriculture (USDA),
California Coastal Commission, and National Aeronautics and Space Administration (NASA). Imagery from ESRI and i-cubed.
Created by the Pacific Institute, Oakland, California, 2009.
California Flood Risk: Sea Level Rise
00.511.520.25
Miles
01230.5
Kilometers
1:
2:
3:
4:
5:
6:
7:
8:
Seal Beach
Newport Beach
Tustin
not printed
Laguna Beach
not printed
not printed
not printed867
1 2 3
54
§¨¦
£¤
")
¬«
Interstate
US Highway
State Highway
County Highway
Grid coordinates:
UTM Zone 11N meters
Adjoining Quadrangles:
Map extents match USGS 7.5 minute topographic maps
Project funded by the California Energy Commission’s
Public Interest Energy Research Program, CalTrans,
and the California Ocean Protection Council
Newport Beach OE S Quadrangle
NAD83 GCS degrees
Coastal Zone Boundary
Current Coastal Base Flood
(approximate 100-year flood extent)
Sea Level Rise Scenario
Coastal Base Flood + 1.4 meters (55 inches)
Landward Limit of
Erosion High Hazard Zone in 2100