HomeMy WebLinkAbout20191204_Coastal Hazards Analysis
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
November 15, 2019
Richard W. Barrett
930 Via Lido Nord
Newport Beach, CA 92663
RE: COASTAL HAZARDS ANALYSIS REPORT FOR COASTAL
DEVELOPMENT PERMIT
Richard W. Barrett; Applicant
930 Via Lido Nord
City of Newport Beach, County of Orange
PMA Job #24918-1
Dear Mr. Barrett,
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
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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 Medium-High Risk Aversion, over the project’s
planning horizon of 75 years, the estimated Sea-Level Rise (SLR) for year 2094 shall be
approximately 6.00’, 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 +13.70’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 enclosed Topographic Survey, finished 1st floor elevation of the existing
development is at +12.94’ NAVD88=+13.12’MLLW which is higher than the Base Flood
Elevation established for the area. Based on the SLR established in Step 1 above, 1st floor of the
proposed structure will remain below High Tide sea level approximately until year of 2085. 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 SLR 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-1 thru SW-3, top of the proposed Concrete
Stem Wall at Lower Seawall shall be at +10.00’ NAVD88 which equals +10.12’ MLLW and top
of Existing Upper Seawall is at +11.7’NAVD88 which equals +11.88’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 SLR generally fall in the range of 4.5-6.7 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. As determined in Step 2 above, 1st floor
elevation of the proposed structure will remain below High Tide sea level approximately until
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year of 2085. After that, if necessary, the seawalls can be raised in accordance with the attached
STD-601-L to an elevation of +13.7’NAVD88 (based on 6.0 feet of SLR) without bayward
encroachment of the bulkhead footprint to protect the structure on the lot from flooding.
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.
.. ··.·, := / Limit of Wave Runup '~----, Stillwater
Elevation
Hypothetical Slope
Wave Runup Sketch
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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. Both existing seawalls, lower and upper are
required to protect the existing structures on the lot, the adjacent properties, public facilities
and infrastructure; thus, they can’t be removed. Removal of the seawalls will result in erosion
and undermining the foundations of the structures and site walls at the subject site and both
adjacent sites. Once the existing lower seawall is raised in compliance with the enclosed
drawings SW-1 thru SW-3, need for a new shoreline protective devise is not anticipated over
the economic life of the existing 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 existing seawalls
assemblies allow to be increased in height per the enclosed STD-601-L without further seaward
encroachment. If during this period the seawalls displays any sign of distress that requires
immediate attention, they 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.
PA2019-251
Respectfully submitted,
Plamen Petrov, P.E.
Principal
Enclosures:
Location Map
Aerial View
Topographic Survey
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-1 thru SW-3
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PMA l;onsol-ting"' In~.
Consulting Structural Engineers
28161 Casitas Ct., Laguna Niguel, CA 92677
Phone: (714) 717-7542
E-Mail: P.Petrov@PMA-BG.com
930 VIA LIDO NORD
NEWPORT BEACH, CA 92663
LOCATION MAP
JOB. 24918-1
SHT.
DES. PBP
DATE 09/20/19
PA2019-251
PMA C;onsulting., In~.
Consulting Structural Engineers
28161 Casitas Ct., Laguna Niguel, CA 92677
Phone: (714) 717-7542
E-Mail: P.Petrov@PMA-BG.com
930 VIA LIDO NORD
NEWPORT BEACH, CA 92663
AERIAL VIEW
JOB. 24918-1
SHT.
DES. PBP
DATE 09/20/19
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/, ,:; y ,/ ,/, '6 0 -z, Si C) \ ,/, ,,/, /, ,/ , ,/ ) -MONUMENT A TJON NOTE: SURVEYOR OR ENGINEER SHALL PERMANENTl Y MONUME:NT PROPERTY CORNERS OR OFPSETS BffORE STARTING GRADING. 1HtSISHOTAIIOl/NOAltYSU'i'\£Y.ll!£ltlPOCllAPHCIUIURESASSHOIIIH Cf!<lli'SIIAl'IIAYEAO.l/51EDl!El.All\'£7tl1'£PI.AT""""COUP!E-OFA IJOIJHPMY$1N!lo(Y. LEGEND ~-•· ~-•· ~-•· ltP•ltPSLaaE" ltlt•TOCSI.Cf'C "•flHISliFUXIR GFF•CNfAGERIOSHFtOOR ltl!•IO'IIOOf' Bll'•SACICIMIJ{ SC0•$£11[lfaLlHOI/T PP•POllfltl'OlE lfV•ll'AWIVAL\1£ 1111 • ... mi lf£1£lf llMl•~8ENCHIMRIC S.F.H.•S£N!Cllmf"OUHOHOTHINC \•CO<IDILWC t•PlffPOfrtl,Jo£ TOPOGRAPHIC MAP LOT J2B 1RACT NO. 907 930 \1A LIDO NORD NEWPORT BEACH CA. 0CS 80/CHll,,llll< NIIJ-2>-n El.fY. • U,f>2 HA>t)M D,l1tAI SW1H COAST~ J214 Q.AY ST. H<:IIPCWT llCM.H CA. (!Uf}U>---.0 PA2019-251
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.
PA2019-251
PA2019-251
DHQ:
♦-------+-MHW : 4.68
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NOTE:
2-#4 CONT. EPOXY-COATED
PER ASTM A934
8" CONCRETE BLOCK WALL ADDED
TO TOP OF EXISTING BULKHEAD
#5 @ 24" O.C. DRILL AND EPOXY BARS PER
MANUFACTURER'S RECOMMENDATIONS INTO
EXISTING COPING
TOP OF IMPROVEMENTS ~
2"
~~---~---+,-------,
6"
MIN.
EXISTING TIE R\D ~ ...... · ... · .... · ·· ·
ALTERNATE "A"
(CONCRETE BLOCK)
11/2" CHAMFER {TYPICAL)-----~
#4 CONT. EPOXY COATED A934 ---~
CONCRETE: f'c = 5,000 PSI (MIN.)---~
W /C RATIO = 0.40 (MAX.)
#5 @ 24" O.C. DRILL AND EPOXY BARS PER
MANUFACTURER'S RECOMMENDATIONS
INTO EXISTING COPING 6"
TOP OF IMPROVEMENTS--MIN.
EXISTING TIE ROD ~ _. _ .. ·
l_ _ .. '-.·· ) .. -··
ALTERNATE "B"
(POURED-IN-PLACE CONCRETE)
EPOXY SHALL CONFORM TO ASTM C881 STANDARD AND BE
USED IN STRICT ACCORD WITH THE MANUFACTURERS PRINTED
INSTRUCTIONS.
8"
/
PROPERTY, BULKHEAD
OR OTHER BAYWARD
LIMIT
----=T T -ELEVATION + 10.0 M.L.L.W.
U) &,
w.-t ; .s
cc = >N ....
ROUGHEN FOR BOND
AND APPLY EPOXY
EXISTING COPING
C I ", ~EXISTING BULKHEAD
I
PROPERTY, BULKHEAD
OR OTHER BAYWARD
LIMIT
1 ELEVATION + 10.0
I M.L.L.W.
ROUGHEN FOR BOND
AND APPLY EPOXY
BONDING AGENT PER
MANUFACTURER'S
RECOMMENDATIONS.
EXISTING COPING
--------EXISTING BULKHEAD
REV. 01/17
CITY OF NEWPORT BEACH APPROVED:
DETAIL FOR RAISING
BULKHEADS
Drawn: R. OKADA
Date: JULY 2004
DRAWING NO.
PUBLIC WORKS DIRECTOR
Scale: N.T.S.
STD-601-L
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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
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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
PACIFIC
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PA2019-251
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