HomeMy WebLinkAbout1983-03-15; City Council; 7315; AUTHORIZATION OF REPRESENTATATIVES TO THE STATE AND TO THE FEDERAL EMERGENCY MANAGEMENT AGENCY0 w > 0 CL 0 G- 4
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C1- CARLSBAD - AGENDelLL
AB# 73 g s’ Tm- AUTHORIZATION OF REPRESENTATIVES DEPT.
3-15-83 TO THE STATE AND TO THE FEDERAL CITY A MTG.
DEPT. ENG CITY N
RECOMMENDED ACTION:
EblER G EN CY FlANA G EME NT AG EN CY
City Council designate the City Manager as its authorized representative to the State and to the Federsl Einergency Management Agency (F.E.I.4.A.).
DIscussroN:
In applying for reimbursement funds for cleanup and repair
of damage done during the declared disaster, it is required that all agencies officially designate representatives to the State and to the Federal Emergency Management Agency. The State representatives recommended that this be done designating representatives by title rather than by name. No correspondence regarding reimbursement will be accepted by the State from anyone other than the designated representatives,
FISCAL IMPACT:
There is no cost associated with designating reFresentatives
EXHIBIT:
Designation of Applicant’s Agent, F.E.M.A. Form 90-63.
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.I[; 7.1-1, 3s thcy relate to the :ip;>lication, xcept.in
rance acd certifies wit!? rtsspect to and 3s a contlit
:.u,i~t*~~r~t.s, ;inti rrtluirernents incluc I use* oi F'wIvral funcis ior this FCC @ " ._,, . . J., .,,,(, ,L.LIJ;. $I . zll><>. l!ll* :\;)l>llCJflt Eib i t!w Criirit that:
the political jcttvity of enipl(,yees.
15. It will comply with the provisions of the [latch Act wf * 1. It possrssths 1e~a1 :~ritl~ority lo apply ior the grant, and to finance
and construct tht. propowil facilltit,.;. tiioc ;i rcwlutwn. motion or
similar action ha> I)C(II diily ~clc~~~w~.! or p:tcsed as an ofiicial act
of the ni;[)Iicaiit's coverninc tidy. antiivrizinq the filin): or the 16. It will col;>pIV with the minimum wage and maximu provisions of the Federa1 Fair Labor Standards Act. as the ap1,lication. iiicIuc!in;! all untlerstandinxr arid assuranccs contained hospital and educational institution ernplopes of s thrrrin. arid c!irectinc and authorirlnc the person idtbntilied s the ot'iici:il ri.prrscntativc of the appilCJnt to Jct in connection with loco1 Covernincnts. the ai,plication act! to providt. suck :idtli:ional information as
ma:: tie required. 17. (To the brst of his knowledge ;ind b4ief) the tiisaster rei described on e:ich 1:ederaI Enercency hl;inaqement
(FESIA) Project hpplicat:on for which Fcrtcral Fina sistance is requrstud is cligihle in accordance with thr contnined in 4 i Code of Fcde;nl Regulations. Part 5 applicabke FEXf;\ Handbooks.
2, It will cornply wi!h the provisions of: fxecstiv? Order 11988, rc1;iting to Ylootl;:ia*n 1lnraa~6~nicnt and Executive Order 1:990, relatinp to ProLccrion 0: Wetlands.
3. It rvill have' sufficient funds availal>le to mret the non-Fcderal
share of thc cost :or construction projects. Sufficient funds wdl 18. The eniercency or disaster relief work therein descrl be availniile ivhrn con~trucr~on is completed to ;i.isurc effective operation and mainicrirince of the fdciiitp [i)r the purpose \vi!] not duplicatr benefits rrceived for the same 10.3 fron
constructed. another source.
It will not enter into R consrrvction contract(s) for the project 01 undertake oiher activities until the conditions ot the grant pro-
gr;ini(s) have bcen met.
it will provide and maintain coinpetent and adequate architectur- al cngtncering su;>ersiiion and inspection crt the construction site
to insure that the completed \vork conforms with the approved plans and spwificntions; thzi it will furnish progress reports and such other in:ormarion as the Federal grantor agency may
It wili operate and maintain the facility in accordance with the minimum s:snd,irds as may be requi.red or pre,=ribed by the
applicah!e Federal. State and local agencies for the maintenance and operation of such facilities.,
which Federal .4ssistnnce is rcciuested hereunder do^
4. 19, it will (1) provide LvitIlfitlt cost to the United S::1~5 a easements rmcl rights.of-way necessary for acconiplshmer
approved work: (?) hold and SJVC the L'nited States fr damages due to the approved work or Federal rundin:.
0-0. This assurance is given in consic!i?ration of and for the pi11 obtaining any and all Federal grants, loans, reirnhursemc
varices, contracts. property, discounts of other Fcdera! I assistance extenc!t,d after the date hereof to the Appli FE?,IX that such Federal Financkl assistnnce wi!l be ext6 reliance on the representations and acreeinents macie in surance and that the I2ni:t.d States shall have the right
judicixl enforcemen! of this assurance. This assurance is on the applicant, its successors, tra:::;fercv?s, and assigiees. person or persons whose signatures appear on the reyers thorized to sign this assurance on behalf of the applicant. 7. It will give the Zrzntor agency and the Comptroller General, throuph any authorized representative, access to and the right to
examine ali records, books, pqwrs, OT documents related io the 21. It will comply wi:h the flood insurance piirchase reqttircm
grant. Section 102(a) of the Flood [)isaster Protection Act of Public Law 93-1-34. 57 Stat. 975. approved December 31. 8. It ail1 require the facility to be desizned to comply with thc Seciion 102(a) requires. on and after hlarch 2. 1955, the pi "American Stctndsrti Specifications for Naking Buildinss aad of flood insyrance in communities Jvhere such insuri
.. ,Facilities Xccessihle to. and Usable by the Physically. fIantli- available as a-condition for the receipt of any F'edcral ii capped." Number Al17.1-1961. as modified (11 CFK 101-17- assistance For construction or acquisition purposes ior us? 7031). lhe applicant will be responsible for conductins in- area that hs been identified by the Dir'cctor, Fecierai Ern5
spectiuirs to insure cornplinnce with these specilicarions by Slanagenient Agency as an 3rca having s?ei-i31 1lood hzznrc the contracior. phrase "Federal iin:1ncial asisinncc" includes any form o
It will cause work on the project to be commenced 1r;ithin a assistance loan or grant. or any ur!ier iorrn ur c!ircct or i: rrzonable tirne 3T:er receipt of notificzrio:, rrom, the approvinn, Federal assistance.
Fed6:ral agency that funds have been approved and wiil see that
work on the project will be prosecuted lo completion with 22. It will comply with the insurance requirements of Sectio reasonable diligence. PL 93-258. to obtain and mainuin any orher insurance as n reasonable. atlequ3te. and necess'iry to protect azainit FLirth
10. It will not dispose of or encumber its title or other interests in to any property whirh was repinfed, restored. repsired. c
the site and facilities during the period of Fcderal interest or structed with this assistance. whilr the Governrncnt holds bonds. whichever is the longer.
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grant, guarm:Y, it:surnnce paymenr, rebate, snbj~dq.. c 9.
23. It will defer funding of any projzcts involving rlcsible fun(
. 11. It axrees to comply with Sccrion 311. P.L. 93-288 and viith until FEh1.A makes a Cavorahfr en.dironmcn(at clearance. ' is required.
24. It will assist the Federal :rm:or :icency in its complirtnc
Section 106 of the N:itionctI kiistoric Preservaiion Act of
as 'amended, (16 IJ.S.C 470), ErPrutive Order 11593. 3 t\rcheolo<ical and €listoric Freservdtion )kt of 1366 (iG 4693.1 et seq.) by (a) consultine witti the Stat<, Iilstoric
vation Officer on the conduct of inves:ieations. 2s ncc to identify properties listed in or eligible for inc11tsi,)il National Registrr of lfistoric places that are s!ib!t,ct :o 2
effects {see 3G CFR Part EOO.$) by the activity. and r>o
the Federal grantor agency of !he existcmce of any such r
ties. and 11s (1)) cornplying wirh a!i rcquirvmrn;s cst,lt)Iiit the Federal grantor agency to avoicl or mitigate adverse upon such properties.
Title VI of thr Civil Kich!s Act of 1964 (P.L. 83-33?) 2nd in accordance with Title VI of the Act. no person in the United states sl,ill\, on the Fround of race, coior. or nntionnl oriSin, be
excluded from participation in. be denled the brveiirs of. or be otherwise suhjcctpd to discrimination under any procram or activity for which the spp!icanc rrceives Federal financial 3j- sistance 2nd will ir;irncc!lateiy take xi? mea,ures necrLssary to eifwtu:ite this a~reernrnt. Ii any real property or structure :s prosided or irnprosrd with the aid of Fedcrd financial assist- ance rxtent1c.d 10 the .\pplicnnt, this as?urance shail ohligate thp
Applicant. or in the case of any transfer of such pro:>er:y, arly trawferee, for thr pcriod during which the real proprrty or structure is ust.d for 3 purpose for which the Fec!crn\ rinailcial assistance is c*xIrnc!wl or for mother purposv involving the provision ot' sirnilx services or benelrts.
19. It will rstahliah s:ifveu;lrds to prohihit employres from using
their position:; for ;I purpoje Lti;lt ij or ~Ivps ~1,~ :!ppPar3nce of
others. p:ir[~culdriy tho.re with whom ci\ry t,ave family, buslnt..;s, or orher tii!s.
13. IL will c~imply with thr rt~qulrcrnpnts of Titlc. 11 arlti Title I[[ f,f the L'niforrn lt*s\lxJ:lfm Xi5irt:tncr Irid Ke.?l Property ,\crlu,. ti I)rov,Llrs cor (.,lr :lnc~
cq II I! .I Ne t rv:i t m rn t o i ;it' rso n s (I i sp J :I5 a res\l\: "f Fctlrra] arid ~r~:L~r,~l~s-~.~i~t~,l programs.
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25- it Will, for any rci);lirS or constructic,n finAncetl ttprpwil!,. C, Nith ai>pIic:iI>Iv ititrt<idrcIs of szi.ery, ciecrr:c)i iiiid c;;ni;,:tjo brine rnot;v.,t+.d t,y J &,sire ior prtuate gam io: ttit.mjc.lvrs or in coniormity with applicdile c~dt.s, sprciticatir)ns attd
' dartis; arid. will eV:Illi;lte the n;i!ur.d haz:ircl.i In :irt'Js in
the prr'cwds cif the grnnt or Io:in nrc ICI bc u,cd ond i.ri proprinte action to miticate such haz;irds. inclurlrng s.7ie
use and constructiam practices.
sition5 kr t>i 1970 tPL Eil.f.161
STATE ASSURANCES
I.!. It will conlp!Y Wilh a\\ recjuirPmt.nts imposrd by the Fedt.ral
v;I~'(I)~ a~ncy ro'lci'rll!~ s:)rc!.+l rc(iulrt.mwts CI< 1:lw. prqrarn rccltiiri.mrnts, 2nd oth*'r .idnlinlsrr:itlv*> rtquire.lrirnts .ilj;)r~,veci it]
wcorc)ance wlol ul1LJ ~IKU~~~~ ~~.L(~~, t'. I,. ~J-z~B ns smrndrd. and eppllcat>lr Fcc!r%r.d I+< ti iri 1 ia mr.
Thp State lurppJ to (.?kI. :lny n,.c,.ssary acLion wirt,in Statr c.ll,.,:l
(0 r''ctuire con~[i~iancr with tht.\r as.,uranct.s anti .i:rr*t~m,*nc=, 1,'
appilcarlt or tt, n55t11,~c rl,~~~,~li~,l~,l~~~y to !Ile l>t.cj,.rdl %~Jvrrnmrr, an? c!rficwncirs not rcc[,ivt.ci to tlie sati>f.icti<tn ',r rile ltzi: Dirvctor.
DESIGNATION OF APPLICANT'S AGENT
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RESOLUTfON
CITY OF CA3LSBAD
(Governing Body) [Public Entity) RE IT 11ESOL2F'i;:T3 BY CITY CO'JNCTL OF -___-A
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CITY NANAGER -- THAT - Y- * (A'atne of Iricrrrribent)
ACTING JlANAGER
(0 ff1CiQl Pmitiorz) on
3 Governor's Authorized Representative, * (Name of Incumbent)
is hereby authorized to execute for and in behgjd of City ~f Carlsbad
~ a public entity established tinder the law of the State of-
this. application md to fiIe it in the appropriate State office for the purpose of obtaining certain Fe
assistance under the Disaster ReIief Act (PLiblic Law 2SS, 93rd Congess) or otherwise available fro
Disaster Relief Fund.
__ , a puttic entity established iintfer the la-, of California , hereby 3uthorizt.s its agent to provide to the State and 1 Emergency LInnngement Agency (FELL%) for all matters pedaining to such Federal disaster a5;ist;r
and agreements printed on the reverse side hereof.
THAT- CITY OF CARLSRAD
Passed and approved this 15th day of ?IAXCH ,1983.
9Ze-ZL-
MAAP,Y H. cisg, (1VQme a?~d Title) &:BYOR
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- (Name azd Title)
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(Name mad Title)
CERTl FE CATION
I, ALETHA L e RAUTENKRANZ I dujy appointed an6 CITY CLERK
(Title)
, do hereby certify that the above is a true and correc
CITY OF CARLSRAD
CITY OF CARLSBAD
of CITY COUNCIL resolution passed rind approved by the
(Governirzg Body) {Pi1 Olic ETi tit?) I
83
9 19- klAXCH day of 15th on the
Date: h*d~. j L j ["i? \ .t.
CITY CLERK h-dm .J Rd,G& d i (Official Position) . (Sign at I i rc j
*,Yorrl~ of iricuntbpnt 1icctl not iw prnr*idctl iri fliosp C(IAPS udimc thc gowining body of thc yirbfic cn?fty desires lo L'
iiictrrn:jertt o/ the ticst,<nctecl offrcirrl porrlioii lo rrpwseerit I!.
FEhiA Form 30-63. MAIX 81
July 26, 1983
5. APPLICANT
City of Carlsbad
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instructions
All entries on this form should be typed or printed except the offic
signature in Item 6.
Item 1. Enter official name of the political subdivision. Include additic
identification such as county, city or town if there is anot
political subdivision with the same or similar name.
Item 2. If the political subdivision in item 1 is a county or city, enter "sa -- in item 2.
Item 3. Enter State name.
Item 4. Enter date assurance is signed.
Item 5. Enter the name of political subdivision the same as in item 1.
Item 6. Print or type the name and title of the official authorized to exec
this assurance on behalf of the applicant jurisdiction. The na
official must sign for the applicant jurisdiction. (Note: It IS requi
that this assurance be executed by an official authorized to sign
the applicant jurisdiction, including the emergency servic
organization and all other agencies of the jurisdirsion such as fire
pol ice department s . )
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TABLE OF CONTENTS
Page
1.0 INTRODUCTION ..................................................... 1
101 Purpose of Study, .......................................... 1
1.2 ~utho~ity and Acknowledgments .............................. 1
1.3 Coordination ............................................... 1
2.0 AREA STUDIED ..................................................... 2
2.1 Scope of Study ............................................. 2
2.2 Community Description ...................................... 4
2.3 Principal Flood Problems ................................... 4
2.4 Flood Protection Measures .................................. 7
3.0 ENGINEERING METHODS .............................................. 7
3.1 Hydrologic Analyses ........................................ 7
3.2 Hydraulic Analyses ......................................... 13
4.0 FLOOD PLAIN MANAGEMENT APPLICATIONS .............................. 16
4.1 Flood Boundaries ........................................... 16
4.2 Floodways .................................................. 16
5.0 INSURANCE APPLICATION ............................................ 19
5.1 Reach Determinations ....................................... 19
5.2 Flood Hazard Factors ....................................... 20
5.3 Flood Insurance Zones ...................................... 20
5.4 Flood Insurance Rate Map Description ....................... 22
6.0 OTHER STUDIES .................................................... 22
7.0 LOCATION OF DATA ....... i ......................................... 23
8.0 BIBLIOGRAPHY AND REFERENCES ...................................... 23
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TABLE OF CONTENTS (Cont Id)
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FIGURES
Figure 1 - Vicinity Map ................................................ 3
Figure 2 - Floodway 5chemtic4 4 I4 I I I I I4 I I b I4 b b 4 146 b I b I I *I I b I I b I I I I I b I I I 19
TABLES
Table 1 - Summary of Elevations ........................................ 12
Table 2 - Summary of Discharges ........................................ 14
Table 3 - Floodway Data................................................ 18
Table 4 - Flood Insurance Zone Data.................................... 21
EXHIBITS
Exhibit 1 - Flood Profiles
Buena Vista Creek Panels 01P-04P
Exhibit 2 - Flood Boundary and Floodway Map Index
Flood Boundary and Floodway Map
PUBLISHED SEPARATELY :
Flood Insurance Rate Map Index
Flood Insurance Rate Map
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FLOOD INSURANCE STUDY
1 - 0 INTRODUCTION
1.1 Purpose of Study
This Flood Insurance Study report has been prepared to revise
and update a previous Flood Insurance Study for the City of Carlsbad
San Diego County, California, which was published on May 31, 1974.
This information will be used by Carlsbad to update existing flood
plain regulations as part of the regular program of flood insurance
by the Federal Emergency Management Agency. The information will
also be used by local and regional planners to further promote
sound land use and flood plain development.
In some states or communities, flood plain management criteria
or regulations may exist that are more restrictive or comprehensive
than tbose on which these federally supported studies are based.
These criteria take precedence over the minimum Federal criteria
for purposes of regulating development in the flood plain, as
set forth in the Code of Federal Regulations at 44 CFR, 60.3.
In such cases, however, it shall be understood that the State
(or other jurisdictional agency) shall be able to explain these
requirements and criteria.
1.2 Authority and Acknowledgments
The source of authority €or this Flood Insurance Study is the
National Flood Insurance Act of 1968, as amended.
This study was prepared by Dames & Moore for the Federal Emergency
Management Agency under Contract No. C-0542. This work was based
on the hydrologic and hydraulic analyses performed by Tetra Tech,
Inc., under Contract No. H-4543 and the California Department of Water Resources under Contract No. H-3947, €or the Federal
Emergency Management Agency. This work, which was completed in
December 1981, covered all significant flooding sources affecting
Carlsbad.
1.3 Coordination
The following agencies were contacted in an attempt to explore
all possible sources of data including information describing
hydrological conditions, drainage patterns, historical storm systems,
tides and waves as well as information on the topography, roads,
benchmarks, beach profiles, shelf bathymetry flood protection
structures (seawalls, breakwaters), and the demography of coastal
communities of San Diego County:
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California Coastal Commission
California Department of Transportation
CQ2M HILL, Inc.
City of Carlsbad, California
City of Chula Vista, California
City of Coronado, California
City of Del Mar, California
City of Imperial Beach, California
City of National City, California
City of Oceanside, California
City of San Diego, California
City of Vista, California
Comprehensive Planning Organization of the San Diego Regiol
National Oceanic and Atmospheric Administration, Eastern
National Oceanic and Atmospheric Administration, National
National Oceanic and Atmospheric Administration, Tide Pred
Pacific Hurricane Center
Climatic Center
tions Branch
National Weather Service l Los AngeleS, California
San Diego Coast Regional Commission
San Diego County
San Diego County Department of Sanitation and Flood Control
San Diego Public Library
Scripps Institute of Oceanography
Security Pacific Bank
U.S. Army Corps of Engineers, Coastal Engineering Research
U.S. Army Corps of Engineers, Los Angeles District
U.S. Army Corps of Engineers, Waterways Experiment Station
U.S. Department of Defense, Fleet Numerical Weather Center
U.S. Geological Survey
Center
The state coordinator was involved in this study through the San
Francisco Regional Federal Emergency Management Agency.
The final coordination meeting was held on November 23, 1982,
ment Agency, the study contractor, and the city. No problems
were raised at the meeting.
and was attended by representatives of the Federal Emergency Mana
2.0 AREA STUDIED
2.1 Scope of Study
This Flood Insurance Study covers the incorporated areas of the
City of Carlsbad, San Diego County, California. The area of stud
is shown on the Vicinity Map (Figure 1).
Buena Vista Creek and Pacific coastal areas in the vicinity of
Buena Vista Lagoon and from the Encina Powerplant south to the
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vicinity of Carlsbad Boulevard and Manzano Drive were studied
in detail.
Those areas studied by detailed methods were chosen with conside
tion given to all proposed construction and forecasted developme
through 1986.
2.2 Community Description
Carlsbad is located along the P.acific coast in northwest San Diel
County in southern California. The city is adjacent to Oceansidl
on the north and northeast, Vista on the east, unincorporated
areas of San Diego County on the east and south, and the Pacific
Ocean on the west.
According to LS. Census Bureau figures, the 1980 population of
Carlsbad was 35,490, an increase of 137.5 percent since 1970.
The climate of Carlsbad, moderated by ocean winds, has an averagl
temperature of 55'F in January and 72OF in August. Rainfall alo
the coast averages from 10 to 13 inches annually, mostly falling
from December through March.
Buena Vista Creek originates in the San Marcos Mountains and flot
westerly along the northern corporate limits into Buena Vista
Lagoonp which empties into the Pacific Ocean. The entire waters1
lies within the county of San Diego and includes parts of the
Cities of Vista, Carlsbad, and Oceanside.
The Buena Vista Creek watershed is long and narrow in shape.
State Highway 78 abuts the creek for almost the entire study reac
It connects with Interstate Highway 5 on the west and U.S. Highwi
395 on the east, facilitating quick transportation and communical
between Oceanside, Carlsbad, Vista, San Marcos, Escondido, and communities outside the immediate area. Several highway intercha
have been constructed, such as the one at Jefferson Street and
College Boulevard, which traverse the flood plain. The provisior
of these excellent transportation facilities will contribute to
increased residential, commercial, and industrial development
in the area.
2.3 Pr inc ipal Flood Problems
The southern California coastline is exposed to waves generated
by winter and summer storms originating in the Pacific Ocean.
It is not uncommon for these storms to cause 15-foot breakers.
The occurrence of such a storm event in combination with high
astronomical tides and strong winds can cause a significant wave
runup and allow storm waves to attack higher than normal elevatio
along the coastline. When this occurs, shoreline erosion and
coastal flooding frequently result in damage to inadequately pro-
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tected structures and facilities located along low-lying portions
of the shoreline.
Brief descriptions of several significant storm events are present
to provide historic information to which coastal and riverine
flood hazards and projected flood depths can be compared (Refer-
ences 1, 2, 3, 4, and 5).
September 24, 1939
A tropical cyclone, due west of San Diego moving up the coast
towards Los Angeles, caused much damage in San Diego County.
Winds ranged from 30 to 60 miles per hour (mph) in the coastal
communities. Considerable wind damage occurred. Point Loma and
Mission Beach were particularly hard hit.
A 20-foot fishing boat went ashore near Cardiff and was battered
to pieces. At Oceanside, the fishing pier which is normally 27
feet above the waterline was closed after the waves began smashing
over the structure. Six pleasure craft were washed ashore at
the San Diego Yacht Club in the yacht harbor at Rosevilie.
December 26, 1940
Mission Beach, Ocean Beach, and Oceanside were the target OF a
series of high waves riding a high 7.1-foot spring tide on the
26th of December.
The forerunner of the storm was observed from the research ship
E.W. Scripps off Baja California prior to December 23. Swells
coming from that distant storm were 50 feet high. More than 3.5
inches of rain fell in San Diego on each of December 23 and 24.
Unusually large breakers began appearing at .Oceanside and at Ocean
Beach on December 25. On December 26, 20-foot high waves smashed
over the beach at Ocean Beach, and imperilled five houses at the
foot of Saratoga Avenue. Damage to structures at the foot of
Cape May Avenue was also reported. One thousand sandbags were
stacked to prevent the surf from undermining foundations of houses
Five hundred tons of rock were placed south of the Mission Beach
across Mission Boulevard and into Mission Bay. At Oceanside,
high waves were observed breaking over the end of the pier. Erosic
at the Wisconsin Street ramp was observed. Sand bags were used
to protect El Sereno Court.
Despite the higher tide (7.3 feet) on December 27, the waves had
subsided to such an extent that they no longer surged over the
Mission Bay seawall.
seawall to break the force of the waves, which sent water surging
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Winter 1977-1978
The entire coastline in San Diego County was hit hard by high
storm waves. Damage occurred to private homes as well as to Stat
city, and county facilities. Private residences located along
coastal bluffs between La Jolla and Oceanside were threatened
or damaged by wave action. In Oceanside, 10-foot breakers floode
the first floor of an apartment building and caused $500,000 in
damages. Stairs, bulkheads, and rock protection belonging to
private residents in Carlsbad were destroyed or damaged by wave
action. As much as four vertical feet of beach sand was washed
away in some areas. The south jetty in Oceanside lost 30 feet
off its end and the entire length was weakened by waves. Total
damage was estimated at between $280,000 and $375,000. Approxima
300 feet of the seaward end of the Oceanside Municipal Pier was
destroyed, amounting to $450,000 worth of damage. Other smaller
amounts of damage caused by wave action occurred at various point
along the coastline.
The winter of 1977-1978 drew attention to the fact that severe
storms coupled with intensified rainfall and large waves may caus
more erosion along the coastline in a shorter period of time than
erosion during years of normal weathering.
Major floods have occurred along Buena Vista Creek as well as
in adjacent basins during both the winter and summer months, alth(
most of the precipitation occurs between December and March.
Rainless periods of several months are common during the summer.
Three types of storms produce precipitation in the area: general
winter storms, general summer storms, and thunderstorms. The
storm selected as critical for the watershed, one producing the
largest peak discharge, is a high-intensity, 3-hour thunderstorm.
Runoff from such cloudbursts is characterized by high peak flows,
short duration of flows, and relatively small volumes.
Snow is not considered an important contributory factor to runoff
in the basin. Also, climatic and drainage area characteristics
are not conducive to continuous flow. Consequently, little strear
flow occurs, except during and immediately following rains. Runo!
increases rapidly in response to rainfall excess.
Damaging floods have occurred in the region which includes the
Buena Vista Creek basin in 1862, 1884, 1895, 1916, 1927, 1932,
1938, and 1942. Little information is available, but indications
are that significant inundation occurred in the basin, blocking
roads and flooding out farmhouses and crops. Flood damage from
such floods has been relatively light since virtually no high-
value developments existed on the flood plain during these floods.
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2.4 Flood Protection Measures
There are no known engineering projects installed OK planned speci
ically for protection against coastal flooding. However, within
the county, breakwaters and seawalls exist at many places along
the coast which are designed to absorb the impact of wave forces.
These provide protection against excessive beach and berm erosion
and function as protection for small craft in harbors. In some
instances, for example, the wall along Strand Way on Mission Beach
and the off-shore submerged breakwater under construction at Imper
Beach may also serve as flood protection measures.
Buena Vista Creek has a concrete-lined channel extending approxi-
mately 0.2 mile upstream from Thunder Drive. However, this channe
does not have the capacity to carry the 100-year flood.
In addition, Carlsbad and other coastal communities in San Diego
County are participating in either the emergency or regular phase
of the National Flood Insurance Program.
3.0 ENGINEERING METHODS
For the flooding sources studied in detail in the community, standard
hydrologic and hydraulic study methods were used to determine the flood
hazard data required for this study. Flood events of a magnitude which
are expected to be equalled or exceeded ~nce on the average during any
lo-, 50-, loo-, or 500-year period (recurrence interval) have been selec
as having special significance for flood plain management and for flood
insurance premium rates. These events, commonly termed the lo-, 50-,
loo-, and 500-year floods, have a 10, 2, 1, and 0.2 percent chance,
respectively, of being equalled or exceeded during any year. Although
the recurrence interval represents the long term average period between
floods of a specific magnitude, rare floods could occur at short interva:
or even within the same year. The risk of experiencing a rare flood
increases when periods greater than 1 year are considered. For example,
the risk of having a flood which equals or exceeds the 100-year flood
(1 percent chance of annual occurrence) in any 50-year period is approxi.
mately 40 percent (4 in 101, and, for any 90-year period, the risk in-
creases to approximately 60 percent (6 in 10). The analyses reported
here reflect flooding potentials based on conditions existing in the
community at the time of completion of this study. Maps and flood eleva-
tions will be amended periodically to reflect future changes.
3.1 Hydrologic Analyses
Analyses were carried out to establish the peak elevation-frequent:
or peak discharge frequency relationships for floods of the selectc
recurrence intervals for each flooding source studied in detail
affecting the community.
7
..
-
The principal source of coastal flooding in San Diego County is
Diego Bay, Mission Bay, and the slough near the mouth of the Tij
River.
Coastal flooding is attributed to the following mechanisms:
from the Pacific Ocean and its landward intrusions such as San
1. Swell runup from intense offshore winter storms in the
Pacific
2. Tsunamis from the Aleutian-Alaskan and Peru-Chile trenc
3. Runup from wind waves generated by landfalling storms
4. Swell runup from waves generated off Baja California
by tropical cyclones
5. Effects of landfalling tropical cyclones
The influence of the astronomical tides on coastal flooding is
also incorporated in each of the above mechanisms. A flood-prod)
event from any of the above mechanisms is considered to occur
with a random phase of the astronomical tide. Each of the above
mechanisms are considered to act alone. That is, the joint OCCUI
rence of any combination of the above mechanisms in a flooding
event is considered to be irrelevant to the determination of floc
elevations with return periods of less than 500 years.
For each mechanism, the frequency of occurrence of causative ever
as well as the probability distribution of flood elevations at
a given location due to the ensemble of events were determined
according to the methodology given in "Methodology for Coastal
Flooding in Southern California" (Reference 6). A brief outline
is presented below.
Winter Swell
The statistics of flooding due to winter swell runup were determi
using input data provided by the U.S. Navy Fleet Numerical Weathf
Center (FNWC). This input data consists of daily values of swell
heights, periods, and directions at three deepwater locations
beyond the continental shelf bordering the study area. The data
spans the period'from 1951 to 1974, and was computed by FNWC usin
input from ship observations, meteorological stations, and synopt
surface meteorological charts of the Pacific Ocean. For the pres
study, the incoming swell provided by FNWC were classified into
12 direction sectors of 10 degrees band width each. (Exposure
of the study area to winter swells was confined to a 120-degree
band, i.e., swell coming from directions 220' to 340' T). Within
each sector, 10 days of swell height and period values were selec
from the 24 years of FNWC data to represent extreme flood-produci
8
- II
days. The selection criteria was guided by Hunts formula for
runup. The 120 days at each of the 3 deepwater stations were
merged to obtain a master list of 161 extreme runup-producing
days. For each of 161 days, the input swell provided by FNWC
was refracted across the continental shelf and converted to run-
and data required for this are described in Section 3.2. Of the
161 days, a number of groups of consecutive days could be identif
Each such group of days is considered to represent one event only
the largest runup from each group of days was selected as the
maximum runup for that event. As a result of refraction and islai
sheltering effects, a number of the input swells produced no sign
icant runup at certain locations. Therefore, the number of extrei
runup events is less than 161. The average number of events in
the study area is aproximately 40. For each location in the stud-
area, the runup for the extreme events were fitted to a Weibull
distribution to obtain a probability distribution of runup from
winter swell. The Weibull distribution was found to be best suit(
for representing runup statistics (Reference 6) - Because extreme winter swell runup lasts for at least one day, the maximum runup
must be considered to coexist with the maximum high tide.
Regarding the extreme runup values as a statistical sample only,
the influence of the astronomical tides was included by convolvinl
the probability distribution of runup with the probability distril
tion of daily high tides. The latter was obtained from standard
tide prediction procedures (Reference 7) using the harmonic consti
at the nearest available tide gage for which such data exists
(supplied by the National Oceanic and Atmospheric Administration
Tidal Prediction Branch). At each location, the frequency of
occurrence of extreme events is determined by the number of runup
values used in the Weibull curve fit. The number of years over
which these occur is 24. The product of the frequency of occurret
with the complement of cumulative probability distribution of
the runup plus tide (convolved) distribution gives the exceedence
1
up at selected locations in the study area. The techniques used
frequency curve for flood elevations due to winter swell runup.
Tsunamis
Elevation-frequency curves €or tsunami flooding were obtained
from information,supplied by the U.S. Army Corp of Engineers Water
ways Experiment Station (WES) (Reference 8). The use of the resul
of the WES study was directed by the Federal Emergency Management
Agency.
The statistics of tsunami elevations along the coastline were
derived in the WES study by synthesizing data on tsunami soilrce
intensities, source dimensions, and frequencies of occurrence
along the Aleutian-Alaskan and Peru-Chile Trenches. As a result,
75 difference tsunamis, each with a known frequency of occurrence,
9
_.
were generated and propagated across the Pacific using a numer ica
hydrodynamic model of tsunamis. At a number of locations in the
study area, these 75 tsunami time signatures were each added to
the tidal time signature at the nearest tide gage location for
which harmonic constants for tide computations are available.
One year of tidal signature was generated from the harmonic const
A given tsunami signature was then combined with the tide signatu
and the maximum tsunami plus tide for the combination recorded,
To simulate the occurrence of the tsunami at random phases of
the tide, the tsunami signature was repeatedly combined with the
tide signature starting at random phases over the entire year
of tide signature. Each combination produces a maximum tsunami
plus tide elevation with frequency of occurrence equal to the
frequency of occurrence of the particular tsunami signature used,
divided by the total number of such combinations for that particu
tsunami. The process was repeated for all 75 tsunamis, and the
elevation frequency curve for tsunami flooding was thus establishc
Wind Waves from Landfalling Storms
The source of data for wind waves is the same as that for winter
height, period, and direction data are available are also the
same as for winter swells. The FNWC wind-wave data are directly
correlated to local wind speeds. For obtaining runup statistics ,
the F'NWC daily wave data were converted to daily runup data using
the method outlined in Section 3.2 (Reference 6). The daily runu
data were then fitted to a Weibull distribution and convolved
with the tide in the same manner as for winter swells.
Tropical Cyclone Swell
Runup from swell generated by tropical cyclones off Baja Californ:
was computed using the techniques discussed in Section 3.2 (Refer-
ence 6). To establish the statistics of hurricane swell runup,
the following procedure was used. Data concerning tropical cyclor
tracks were obtained from the National Climatic Center (NCC).
The data comprise 12-hourly positions of eastern North Pacific
tropical cyclones from 1949 to 1974. This was supplemented by
data on tropical cyclone tracks during the period 1975-19778 repoi
in various issues of the Monthly Weather Review (1976-1979).
Besides position data, storm intensities at each 12 hourly positic
are also given. The intensity classifications are based on estimi
maximum wind speeds. The intensity categories are tropical depres
sion (less than 35 knot winds), tropical storm (less than 65 knot
winds), and hurricane (at least 65 knot winds). Storms with tropi
depression status were considered to generate negligible swell
and were omitted from this study. Data on actual maximum wind
speeds were available from the NCC only from 1973 to 1977. These
were used as the basis for obtaining values to represent maximum
swell, namely, the F'NWC (1951-1974), The stations for which dail'
10
w W
wind speeds from each of the two intensity classifications associa
with the track data. Data on storm radii were derived from North
American Surface weather Charts by analysis of pressure fields
of tropical cyclones off Baja California. These were used to
define typical radius of maximum winds for each of two relevant
intensity classes. For each tropical cyclone between 1949 and
1978, the hurricane wind waves were computed by using the mean
radius and maximum wind speeds established for each intensity
class along with the track data. The swell and resultant runup
were computed using the techniques described in Section 3.2 (Refer
ence 6). For each tropical cyclone and each location of interest
in the study area, a time history of swell runup was determined.
These were added to time histories of the local astronomical tide
in a procedure analogous to that used in determining tsunami-plus-
tide effects. The exceedence frequencies of tropical cyclone
swell runup were computed in a manner similar to that used for
tsunamis.
Landfalling Tropical Cyclones
The frequency of landfalling tropical cyclones in southern Califor
is extremely low. During the years (1949 to 1974) covered by
the NCC tape of eastern North Pacific tropical cyclones, no tropic
cyclone hit southern California. A longer period of record was
used to estimate the frequency of an event such as the Long Beach
1939 storm. A study by Pyke (Reference 9) was used to compile
a list of landfalling tropical cyclones along the coast of souther
California. The study was a result of extensive investigations
of historical records such as precipitation and other weather
and meteorological data. The study spanned the period from 1889
cyclones, of which the 1939 Long Beach event was the strongest
and only one in the tropical storm category. The others were
all weak tropical depressions (with maximum winds of less than
35 knots). This low-frequency event (once in 105 years over apprc
mately 360 miles of coastline, coupled with an impact diameter
of approximately 60 miles) implies that for any given location,
the return period of a landfalling tropical cyclone is approximate
600 years. Therefore , landfalling tropical cyclones were not
considered in this study.
At each location within the study area, the exceedence frequencies
at a given elevation due to the various flood-producing mechanisms
were summed to give the total exceedence frequency at the flood
elevation.
Elevations €or floods of the selected recurrence intervals on
the Pacific Ocean are shown in Table 1.
Discharges for the 10- and 100-year floods on Buena Vista Creek
were taken from a 1976 study on Beuna Vista Creek (Reference 10).
to 1977 and showed only five or six identifiable landfalling tropi
11
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Discharges €or the 50- and 500-year floods were taken from discharge
frequency curves which were developed from frequency curves for
similar gaged streams in the county (Reference 11). To draw the
curve, the Standard Project Flood was calculated using the Generaliz
Standard Project Rainflood Criteria for Southern California Coastal
Streams (Reference 12) and routing by the Muskingum method.
Peak discharge-drainage area relationships for Buena Vista Creek
are shown in Table 2.
3.2 Hydraulic Analyses
Analyses of the hydiaulic characteristics of the flooding sources
and shoreline studied in detail in the community were carried
out to provide estimates of the elevations of floods of the selectec
recurrence intervals along each of these flooding sources and
the shoreline.
To obtain run-up values for the various flood-producing mechanisms,
data on offshore bathymetry and beach profiles weEe obtained from
U.S. Coast and Geodetic Survey and National Oceanic and Atmospheric
Administration bathymetric charts, U.S. Geological Survey topograph
maps, surveys of beach profiles, and aerial photographs of the
study area (References 13, 14, 8, and 15,respectively).
Refraction
Refraction computations were conducted to trace the evolution
of winter swell and tropical cyclone swell from their source to
the 60-foot depth contour. A large grid (200 by 250 miles) coverini
the coastal water of southern California with 1,000 by 1,000 foot
grid spacing was used for the refraction calculations. Standard
raytracing procedures were used to trace rays inward from the
deep ocean grid boundaries.
to provide adequate density of ray coverage. Wave heights at
the 60-foot contour were computed using the principle of wave
energy flux conservation between neighboring rays. One set of
refraction computations was performed for each selected event
from the list of extreme winter swells and the list of tropical
cyclones of€ Baja California. The winter swell input values were
obtained from the FNWC tape for the selected days of extreme events
The values at the three FNWC stations were the basis for linear
generated by tropical cyclones, the procedure outlined for tropical
cyclone swell was used to provide input to the refraction program.
Wave Runup
Shoreward of the 60-foot contour, wave runup was determined €or
each beach profile of interest by adapting to composite beaches
the standard empirical runup formulas valid for uniformly sloping
Ray spacing was chosen at 1,000 feet
interpolation to obtain input values between them, For swell
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as input.
one-dimensional to apply the empirical runup formulas. However,
the influence of incident wave directions, refraction, and shoalins
effects was taken into consideration. Wave heights within the
surf zone were also computed using empirical formulas to establish
the zone where waves exceed 3 feet. This is needed for V-zone
designation. Additional details of the procedures used are availat
in Reference 6.
Tsunamis
Tsunamis were computed using numerical models of the long wave
equations describing tsunami behavior. The results were taken
from the U.S. Army Corps of Engineers study which details the
method used to compute tsunami behavior (Reference 8).
Tropical Cyclone Swells
Waves qenerated by a tropical cyclone were determined using the
JONSWAP spectrum with empirically-derived shape and intensity
parameters, which were correlated to radial position and wind
speed (Reference 16). A cosine function based on the local wind
direction was used for the directional distribution function of
the spectrum. The size of the tropical cyclone was defined by
the radius at which the wind speed drops below 35 knots. The
details of the model are given in Reference 6.
For areas of riverine flooding studied in detail, water-surface
elevations for floods of the selected recurrence intervals were
computed through use of the U.S. Army Corps of Engineers, HEC-2
computer program (Reference 17).
Cross section data for Buena Vista Creek were digitized from aerial
surveys (Reference 18). Additional cross section data were taken
from grading plans and field surveys. All bridges and culverts
The beach profiles selected were assumed to be locally
were investigated to obtain elevation data and structural geometry.
Locations of selected cross sections used in the hydraulic analyses
are shown on the Flood Profiles (Exhibit 1). For stream segments
for which a floodway is computed (Section 4.21, selected cross
section locations are also shown on the Flood Boundary and Floodway
Map (Exhibit 2).
Hydraulic roughness coefficients (Manning's "n") used in the hydrau-
lic computations were chosen by engineering judgment and based
on field observations of the channels and flood plain areas.
Roughness coefficients range from 0.015 to 0.045 for the channel
and from 0.024 to 0.050 for the overbank areas of Buena Vista
Creek.
15
..
Starting water-surface elevations for Buena Vista Creek were calci
lated assuming critical depth.
Flood profiles were drawn showing computed water-surface elevatioi
to an accuracy of 0.5 foot for floods of the selected recurrence
intervals (Exhibit 1).
All elevations are referenced to the National Geodetic Vertical
Datum of 1929 (NGVD). Elevation reference marks used in the stud]
are shown on the maps.
The hydraulic analyses for this study were based on unobstructed
flow. The flood elevations shown on the profiles are thus considt
valid only if hydraulic structures remain unobstructed, operate
properly, and do not fail.
4.0 FLOOD PLAIN MANAGEMENT APPLICATIONS
The National Flood Insurance Program encourages State and local governmc
to adopt sound flood plain management programs. Therefore, each Flood
Insurance Study includes a flood boundary map designed to assist commun
ties in developing sound flood plain management measures.
4.1 Flood Boundar ies
In order to provide a national standard without regional discrimii
tion, the 100-year flood has been adopted by the Federal Emergenc]
Management Agency as the base flood for purposes of flood plain
management measures. The 500-year flood is employed to indicate
additional areas of flood risk in Che community. For coastal
areas studied in detail, the boundaries of the 100- and 500-year
floods have been delineated using topographic maps at a scale
of 1:4,800, with a contour interval of 2 feet (Reference 19).
For areas of riverine flooding studied in detail, flood boundarie:
of the 100- and 500-year floods have been delineated using the
flood elevations determined at each cross section; between cross
sections, the boundaries were interpolated using topographic maps
at a scale of 1:2,400, with a contour interval of 5 feet (Referenc
Flood boundaries €or areas studied by approximate methods were
delineated using U.S. Geological Survey Flood-Prone Area Maps
(Reference 20) and the 1977 Flood Insurance Rate Map for the City
of Carlsbad (Reference 21).
4.2 Floodways
Encroachment on flood plains, such as artificial fill, reduces
the flood-carrying capacity, increases the flood heights of streai
and increases flood hazards in areas beyond the encroachment itse
One aspect of flood plain management involves balancing the econoi
16
- - gain from flood plain development against the resulting increase
in flood hazard. For purposes of the National Flood Insurance
Program, the concept of a floodway is used as a tool to assist
local communities in this aspect of flood plain management. Under
this concept, the area of the 100-year flood is divided into a
floodway and a floodway fringe. The floodway is the channel of
a stream plus any adjacent flood plain areas that must be kept
free of encroachment in order that the 100-year flood may be carried
without substantial increases in flood heights. Minimum standards
of the Federal Emergency Management Agency limit such increases
in flood heights to 1.0 foot, provided that hazardous velocities
are not produced. The floodways in this report are presented
to local agencies as ninimum standards that can be adopted or
that can be used as a basis for additional studies.
Floodways in this study were computed on the basis of equal-convey-
ance reduction from each side of the flood plain.
The results of these computations were tabulated at selected cross
sections for each stream segment for which a floodway was computed
(Table 3).
As shown on the Flood Boundary and Floodway Map (Exhibit 2), the
floodway widths were determined at cross sections; between cross
sections, the boundaries were interpolated. In cases where the
boundaries of the floodway and the 100-year flood are either close
together or collinear, only the floodway boundary has been shown.
The area between the floodway and the boundary of the 100-year
flood is termed the floodway fringe. The floodway fringe thus
encompasses the portion of the flood plain that could be completely
obstructed without increasing the water-surface elevation of the
100-year flood more than 1.0 foot at any point.
ships between the floodway and the floodway fringe and their signif-
icance to flood plain development are shown in Figure 2.
Typical relation-
17
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Figure 2. Floodway Schematic
5.0 INSURANCE APPLICATION
In order to establish actuarial insurance rates, the Federal Emergency
Management Agency has developed a process to transform the data from
the engineering study into flood insurance criteria. This process includ
the determination of reaches, Flood Hazard Factors (FHFs), and flood
insurance zone designations €or each flooding source studied in detail
affecting Carlsbad.
5.1 Reach Determinations
Reaches are defined as lengths of watercourses having relatively
the same flood hazard, based on the average weighted difference
in water-surface elevations between the 10- and 100-year floods.
This difference does not have a variation greater than that indicatl
in the following table for more than 20 percent of the reach:
Average Difference Between
10- and 100-Year Floods Var ia t ion
Less than 2 feet 0.5 foot
2 to 7 feet 1.0 foot
7.1 to 12 feet 2.0 feet
More than 12 feet 3.0 feet
19
-.
1’
The locations of the reaches determined for Buena Vista Creek
are shown on the Flood Profiles (Exhibit 1) and summarized in
Table 4.
Reaches are defined as lengths of watercourses or water bodies
having relatively the same flood hazard. In tidal areas, reaches
are limited to the distance for which the 100-year stillwater
flood elevation does not vary more than 1.0 foot. The locations
of the reaches are shown on the Flood Insurance Rate Map (Exhibit
3) and summarized in Table 4.
5.2 Flood Hazard Factors
The F'HF is the Federal Emergency Management Agency device used
to correlate flood information with insurance rate tables. Correla
tions between property damage from floods and their FHF are used
to set actuarial insurance premium rate tables based on FHFs from
005 to 200.
The FHF for a reach is the average weighted difference between
the 10- and 100-year flood water-surface elevations expressed
to the nearest one-half foot, and shown as a three-digit code.
For example, if the difference between water-surface elevations
of the 10- and 100-year floods is 0.7 foot, the FHF is 005; if
is 5.0 feet, the E'HF is 050. When the difference between the
10- and 100-year water-surface elevations is greater than 10.0
feet, accuracy for the FHF is to the nearest foot.
the difference is 1.4 feet, the FHF is 015; if the difference
5.3 Flood Insurance Zones
After the determination of reaches and their respective FHFs,
the entire incorporated area of Carlsbad was divided into zones,
each having a specific flood potential or hazard. Each zone was
assigned one of the following flood insurance zone designations:
Zone A: Special Flood Hazard Areas inundated
by the 100-year flood, determined by
approximate methods; no base flood
elevations shown or FHFs determined.
Zone V: Special Flood Hazard Areas along coasts
inundated by the 100-year flood, as determined by approximate methods,
and that have additional hazards due
to velocity (wave action); no base
flood elevations shown or Flood Hazard
Factors determined.
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W
a
a
2 W C3 w !L
TAB
I -
Zone V1: Special Flood Hazard Areas aiong coasts
inundated by the 100-year flood, as
determined by detailed methods, and
that have additional hazards due to
velocity (wave action) ; base flood
elevations shown, and zones subdivided
according to FHFs.
Zones A3, A4, A6-A8, Special Flood Hazard Areas inundated
A12, and A13: by the 100-year flood, determined by
detailed methods; base flood elevation:
shown , and zones subdivided accord ing
to FHFs.
Zone B: Areas between the Special Flood Hazard
Areas and the limits of the 500-year
flood , including areas of the 500-year
flood plain that are protected from
the 100-year flood by dike, levee,
or other water control structure; also
areas subject to certain types of 100-
year shallow flooding where depths
are less than 1.0 foot; and areas subje
to 100-year flooding from sources with
drainage areas less than 1 square mile.
Zone B is not subdivided.
Zone C: Areas of minimal flooding.
The flood elevation differences, FHFs, flood insurance zones,
and base flood elevations for each flooding source studied in
detail in the community are summarized in Table 4.
5.4 Flood Insurance Rate Map Description
The Flood Insurance Rate Map for Carlsbad is, €OK insurance purpose
the principal result of the Flood Insurance Study. This map (pub-
lished separately) contains the official delineation of flood
insurance zones and base flood elevation lines. Base flood eleva-
tion lines show the locations of the expected whole-foot water-
surface elevations of the base (100-year) flood. This map is
developed in accordance with the latest flood insurance map prepara
tion guidelines published by the Federal Emergency Management
Agency.
6 .'o OTHER STUDIES
This Flood Insurance Study supersedes the 1977 Flood Insurance Rate
Map for the City of Carlsbad (Reference 21) -
22
w W
Flood Insurance Studies are being prepared for the Cities of Oceanside,
Vista, and the unincorporated areas of San Diego County (References 22,
23, and 24). Those studies are in agreement with this Flood Insurance
Study.
A Flood Plain Information report for Buena Vista Creek and a hydrology
report for Buena Vista Creek were published in 1973 and 1976, respective
The 10- and 100-year discharges used in this Flood Insurance Study were
taken from the 1976 hydrology report. These discharges, along with
the 50- and 500-year discharges, are based on the 1973 Flood Plain Infor-
mation report.
This study is authoritative for the purposes of the National Flood Insur
with all previous determinations.
ance Program: data presented herein either supersede or are compatible
7.0 LOCATION OF DATA --
Information concerning the pertinent data used in preparation of this
study can be obtained by contacting the Natural and Technological Hazard
Division, Federal Emergency Management Agency, Building 105, Presidio
of San Francisco, San Francisco, California 94129.
8.0 'BIBLIOGRAPHY AND REFERENCES
1. California Coastal Commission, Wave __-_ Damage Along the California
Coast, Winter, 1977-78, Steve Howe, December 1978
2. U.S. Department of Agriculture, Weather Bureau, Monthly Weather Review, September 1939 ---
3. San Dieqo Union, various dates
4. Kuhn, G.G., and F.P. Shephard, "Accelerated Beach-Cliff Erosion
Related to Unusual Storms in Southerri California," California -
_- Geology, March 1979
5. U.S. Department of the Army, Corps of Engineers, San Francisco
District and Los Angeles District, Winter Storm Damage Along the
__ California __ Coast 1977-1978, prepared by George W. Domurat, 1978
6. Tetra Tech, Inc., "Methodology €or Coastal Flooding in Southern
California," by Y.K. Lee et al., December 1979
7. U.S. Department of Commerce, Coast and Geodetic Survey, Special
Publication 98, P. Shureman, Manual. of Harmocic Analysis and Predic
tion of Tides, 1941
23
,+
- -
8. U.S. Department of the Army, Corps of Engineers, Waterways Experi
Station, Type 19 Flood Insurance Study: Tsunami Predictions for
Southern California, prepared for the Federal Emergency Managemen
Agency by J.R. Houston, September 1980
9. Pyke, C.B., Some Meteorological Aspects of the Seasonal Distribut
of Precipitation in the Western United States and Baja California
University of California WRC Contribution 139, October 1972
10. San Diego County, Department of Sanitation and Flood Control,
Hydrology, Buena Vista Creek, 1976
11. U.S. Department of the Army, Corps of Engineers, Flood Plain Infox
mation, Buena Vista Creek, Pacific Ocean to Vista, San Diego Count
California , July 1973
U.S. Department of the Army, Corps of Engineers, Generalized Stanc
Project Rainflood Criteria for Southern California Coastal Streams
1967
U.S. Department of Commerce, Coast and Geodetic Survey and the
National Oceanic and Atmospheric Administration, Bathymetric Chart
California Coastline , (various dates)
12.
13.
14. U.S. Department of the Interior, Geological Survey, 7.5-Minute
Series Topographic Maps, Scale 1:24,000, Contour Interval 20 feet:
Encinitas, California (19681, Photorevised (1975); San Luis Rey
(1968), photorevised (1975)
15. Abrams Aerial Survey, Inc., Aerial Photographs, California Coastli
Scale 1:4,800, August 1978
16. Lee, Y.K., "Hurricane Eloise Wave Spectra," in Coastal Engineering,
pp. 151-156, 1980
17. U.S. Department of the Army, Corps of Engineers, Hydrologic Engi-
neering Center, HEC-2 Water-Surface Profiles, Davis, California,
1977
18. 3an Diego County, Topographic Maps, Scale 1:2,400, Contour Interval
5 feet: aerial photography flown April 14, 1978
19. Abrams Aer ial Surveys , Inc. , Topographic Maps , Scale 1 : 4 , 800 ,
Contour Interval 2 feet: October 1978
20. U.S. Geological Survey, Flood-Prone Area Maps, Scale 1:24,000,
Contour Interval 20 feet: Encinitas, California (1971); San Luis
Rey, California (1971)
21. U.S. Department of Housing and Urban Development, Federal Insurance
Administration, Flood Insurance Rate Map, City of Carlsbad, Califor
Scale 1:12,000, June 14, 1977
24
- - *
22. Federal Emergency Management Agency, Flood Insurance Study, City
of Oceanside, San Diego County, California, 1983
23. Federal Emergency Management Agency, Flood Insurance Study, City
Of Vista, San Diego County, California, 1983
24 Federal Emergency Management Agency, Flood Insurance Study, San
Dieqo County, California (Unincorporated Areas), unpublished
25
STREAM DISTANCE I
i
i
a
STREAM DlSl
f 6200 5600 6OoO - :> -
r. w
. -,+ .. -. L .. - -.
STREAM DISld
I - - - . . - - - -- I . -_-- - --I_..-----. - -. --------I
~
..
- __~
#
,
.t
__l ------ _._-__-- --
to,m lorn 1~200 ; 1
w -- -2 . ~ -. - .. *. STREAM 01:
t
q
t e e
MEMORANDUM - March 11, 1980
TO : City Manager
FROM : City Engineer ,$%-
SUBJECT: FEDERAL DISASTER ASSISTANCE
San Diego County has been declared a Federal Disaster Area as a result of rains and subsequent flood damage since January 8, 1980.
On Wednesday March 5, 1980, representatives from various
State and Federal agencies met with potential applicants
for Disaster Assistance. Several issues were addressed during the course of the meeting,including:
1. This is the second flood disaster in San Diego County since 1978. The Federal Government is
not particularly interested in paying for the same damage again.
2. Disaster Assistance Funds may carry a condition of mitigation which will prevent a reoccurrence of the same disaster.
Potential aDplicants were asked to file a Notice of Interest listing damages to property and facilities so that Federal inspectors could make formal surveys.
City staff has identified potential projects which may be eligible for Disaster Assistance and needs authorization
from the City Council to file the Notice of Interest.
The Notice of Interest is not an obligation to accept Disas Assistance Funding.
Council Action:
3-11-80 Council approved recommendation of staff to file the Resolution of Interes
for Federal Disaster Assistance with the attached list LE : mmt problems.
5$ -- , e e
DESIGFdAT!ON OF APPLICANT’S LOCAL AGENT
RESOL UT1 ON
BEITRESQLVEDPIY the City co uncil OF the City of Carlsbad * (Governing Soiiy) (FtrSlic Err tify)
/Nome of1ncu)Hhenr) {Cffuid Pasirion)
TmT.AuC..r d # Ma-yor t
is haeLy authorized to execute for and in behalf oi
II_ this sppfimtion and to Pi!z it in the appropriate State office for t!!e purpose of obtaining certain Federal fimncial asqista
~~dier the Disaster ReIief Act (Public JAW 288,93rd COilgrttsS) or otlienvise available from the Pre$dent’s Disaster Retie
Fund.
f. h e r. i t_V 0 f c. a r 1 S b a d
, a gubiic entity eubbkhed andeer the laws of the State OF c a 1 i f 0 r n i a
THAT t h e c i t ‘4 0 f c a r 1 S bad , a public entity established uildtr the law of she State of Cal
, hePeby suthorixes its agmt to provide to the Sfate and to the Ftdad D!&er As; ni a
Adnljnistration CFDAA), Deprtment of Housing and UiSm Development (MUD) for a11 mstters vrtsining to such Fed
disaster nssijsLmm tbc nsurBncea and apexrents priiiicd on the reverse side hereof.
Faswd and approwd this 1 1 t h day of M a r c h ,19u
*U City Ma naaer
Lester G. Evans, City Engineer
(i’icntc and TI^) -
(Nunre ana’ 7i:le)
.-.--. James El 1 i ott , Finance Director
(,t’arne and Titre)
CE RT1 F1 CAT! ON
1, Afetha L. Rautenkranz , duly appointed and City Clerk 4
, do hereby certify that’the above is n true and correct copy of 3 retrolcti
(Ti&)
theCityofCarlsba d
passed arid approved hy the
on the 11th day of March ,i9-. 80
D;I re: - Match 12, 1980
Citv Co uncil of the Cit.y of Carlsbad
(Govt-rning Bo&] (Public En n’fyJ
City Clerk (Ol/icial i’osirion]
HUD - 490 (9-741 f3cpla.c~ Previorx Erhfion on3 OEP Forrn 231 Which Is Obsoleto
* e 0. - -c E
ASS ci R Arm s
A. ??IC State zgrccs to lake nccesstry action within SistC cipnbiiitics to rcq!iire compii.zicc \y,iih :!xse assiir3nces by the appk
or tti aswne respunsibility to the i-edcraf gcvzmrncnt for :n;~ ricficien<ics no! rcwlvol !o the ?atisfaction 0: the Redona1
Dircc tor.
Th3 Asplizant Certifias:
That (to L??S best of his know1cdg.e 3rd bclicf! the disxster rchf work dcscrinsd on cxh Feder:il Diss:er Assistance Admin-
istration (FDAA) Project Appiicaticn for whkh Fcdcrd financizl asslstmi-e is rtqucsted is ciiziblc in accordance with th.: cr
contained in 24 Code of Ycdcrd Mrpuha:ior.s, and ITlA.4 (1IC!D) Ifandbooks.
Tiat it is the legal entity responsible under law for the peifoormance or tfic work d:tS!ed (i:.3c~epti such respondbility.
That the emzrgency or c?isxtc; relief wok therein dcscribcd for which Federal assistmce is rcqucs!ed 2ic;eundzr does not o'
not duplicate benefits receipcd for the same !oss from znother source.
That all informadongiven by it herein is, to the bcst of its knwsledge and belief, trx and correct.
That ail financial cssishnce reccived under this application wiil be, or has bcon, expcndcd in 3cco:dance with applicabirt 137~
regulations thereunder.
Tho App!icaat A$wm:
To (1) providc without cost to the Lizitcd States all Inntls, taicmcn!s, and rights-of-way neceswy far xconiplishment of th
11.
C.
D.
E.
E'.
G.
proved work: (2) hold and sw he hited States free from dam3gcr duc to !he approved work 01 Fcdrrnl funding.
ti. To comply with Title VI of the Civd ?$I% Act of 175.1 @L 38-352) and all requirements imposei! by ?he Fcdexai Dis-stcr
ds!:inct: Ahhistration pursuact to :>.2: Tit!e to the cnd that, i:, accordance ;%?th Tittc VI of th3: Xc: and [!le Kcg!x!atioi:, I
person in thc Uniccd States slull, on 3.2 gound of nce, Coloi, :cligion, nationality, EX, axe, or economic status, be exdr:dc
from psrticipstion in, be dmicd [kc kzcfts of, or bc otlicrwisc aibjxtcil to di~rimlriafioii undcr any program or activity j
xhich the App!icant rkeivzc! Fcdcrrti financial assk:ancc from the Agency and IIEK'EBY C;!ViiS XSSURAVCE TIIA?' it WI
uii mcdin tel y t:j k c any n:e:\sti res 7.z~
Thzt if any redpropcrty or s ':: 2-reon is provided or irn;lrovcd wit11 tile aid of Fcc!cr3! !%xmCh1 assis:w.ce extcrtdcd
the Applicant by the Fcdeia! L: .is&tancc Administration, this assurance sha!I ob:iFats tlic !!cant, or in thc cas c
my tiansfer of such property -.::deice, for the period durins which :he re31 property or str rs is uxti f3r a purpo.
for which the Fedcrd fn39ci3i zzC::nr.ce is cxtcnded or for another purpow involving the p:ovirion of similar services or
kncfits. If any pervorial property I: 3 pro-ded. this assuxi?kc haU ob!iga!c the Applicmt Cor the per!od during which i: i
owncrsllip or possesssicr: of 2:: ;)r~:~::iy. !n 311 othc: ca:cs, this assitrzncc sh.111 ohligatc ti;e Applicant f(?r the pcricd du:ins
which the Fedcral Biimcial BSS;SIL.X is extcilded to it by I:DAA.
'hit the ;t5surance is ~~VCR i7 consideration of md foi the pury~se of obtaining any and dl Federal grants, loxns,reirnburse
rner~ts, advnnccs, contrncts, propz::y, discoun!s or other Fed-ral finnncial assistnncc extcndcd af:ci the date hereof to the I
pi;cant by i:DAA, that such Federal fhncid assistance will be c.xtendcd in rclince oil the repxse:i!ations and agrccrnents
iri ti$s assurance arid that :hc United S:a!es shaE have thc ri$t to scek jtidicial enforccmcn! of this ass::rclnce. T2is assuran
bindin2 sn the Applicmt. its successo~s. trinsferees. acd assigness, and the person or persocs whose siEnatu:es appcu 02 th
r~vc~sc ~L'C authorizcd to sign this sssurancc on behalf of the Applicant.
lo obtain and mainkin any flwd insaraxe as nny be requiicd for the life of Lbe projcc:(s) for \s.hich 1:cdzral financid iiss
fcr a'cquisidon or constrwtion purposts for buildings or mobile homes was piovidcd herein; ani:, to ohtiin and niatntain ar
orhcr lrscrwsc as :nay Dc rc3sonable, adcqute and necessary to protect against icrther lots !r, any prqxrty which was rq
rcslorcd. :c:iairtd or coni:?~.::cc! with tllis assIshncc.
That, as B condition for +e ;:L::~ any rcpairs or conskuction financcd herewith, shag be in accord-nce with applic-blc sta
of safety, dcwncy and ?<:zi;sikD and in conformity with applicable Code., specificatiors and standards; arilb to evzluate ti1
riaturd huards in areas in which the procceds of thc grant or loan arc to be uscd and takc appropriate action to mitiLate SU
standards, iriclliding safe !and use and construction practicrs.
1'0 dcfcr funding of my projccLr involving flcxiblc funding udcr Scction 402 or Section 419 urtti! I:L)AA makes ;i fdv[)rahl
environments1 clearance dcterniincltion, if this is required.
:y to cflcctunte this zgrccinent.
I.
1.
K.
I-.
hf. . i.
I,. .L.
'I
I, . ... . . I
e e
CATEGORY A
DEBRIS CLEARANCE
ITEM NO. LOCAT I ON TYPE OF DAMAGE PREV. DECL.*/EST.
1 BUENA VISTA LAGOON DEPOSITION OF SILT NO/PRELIMINARY ESl
W/O & AT BUENA CREEK HARMING ECOLOGICAL 300' X 600' X 6'/2 D I SCHARGE PRESERVE AT $5/CY = $200,0C
2 EL CAMINO REAL SOUTH MUD ON STREET y E S/ $3 00 $: $:
OF HOSP WAY
3 PARK AT MARINA MUD AND DEBRIS NO/$200;'::';
ON STREET
4 PALOMAR AIRPORT ROAD MUD AND DEBRIS N0)$2002:2:
E/O PASEO DEL NORTE ON STREET
5 PARK AT NEBLINA MUD AND DEBRIS N0/$200;'c$;
ON STREET
6 EL CAMINO REAL S/O MUD AND DEBRIS ON N0/$200+;';
CHESTNUT AVENUE STREET - ROAD HAZARD ADDITIONAL COST FO
REPAIRING 18" PIPE $25/FT. FOR 120' =
$30,000
7 HILLSIDE N/O HIGHLAND MUD AND DEBRIS N0/$500$:$:; $2,000
ON STREET
8 AGUA HEDIONDA LAGOON DEPOSITION OF SILT NO/ U N KNOWN
II DEBRIS BASIN @ MARRON DEPOSITION OF DEBRIS ~0/300' x zooi x 4
AND MONROE x $4 = $35,555
10 LA COSTA AVENUE AT DEPOSITION OF DEBRIS y E S / $7 0 0 $:A
EL CAMINO REAL AND SILT
11 DEBRIS BASIN AT DEPOSITION OF DEBRIS N0/6' X 250' X 350
ALFIL & VENADO AND SILT 27 X $4 = $78,000
12 DEBRIS BASIN AT DEPOSITION OF SILT N0/6' X 200' X 100
END OF MANZANITA 27 X $4/CY = $18,0
13 BATIQUITOS LAGOON DEPOSITION OF SILT NO/UNKNOWN
+: INSOFAR AS IS KNOWN
$:AESTIMATED AMOUNT EXPENDED ALREADY
e e
CATEGORY B
PROTECT IU E MEASURES
lTEM NO. LOCAT I ON TYPE OF DAMAGE PREV. DECL?/EST. c
1 BRIDGE AT EL CAMINO UPSTREAM APPROACHES NO. BANK PROTECT1
REAL NEAR RANCHO ERODED; DOWNSTREAM @ $15/S.F. X 10 X
CARL SBAD EM BAN KM E NT E R 0 D E D 250 = $37,000
J- INSOFAR AS IS KNOWN
e e
CATEGORY C
ROADS, BRIDGES & CULVERTS
ITEM NO. LOCAT I ON TYPE OF DAMAGE PREV. DECLYEST. c
1 PARK @ ALICANTE PAVEMENT FA I LURE N0/$800
POTHOLES REQUIRE
REPA I R
2 LA COSTA AVENUE E/O SLOPE FAILURE N0/$5,000 TO REPAI
EL CAMINO REAL DRAINAGE SYSTEM
3 BRIDGE AT EL CAMINO REAL PILES ENDANGERED BY N0/$5,000
BOTTOM EROSION CUT
4 PALOMAR AIRPORT ROAD CULVERT INLET AND N0/$4,500
E/O PASEO DEL NORTE OUTLET DAMAGED
5 OCEAN STREET N/O I NLET AND DRAIN CAUS I NG N0/$500$~;;"
ELM DAMAGE TO BUILDING ADDITIONAL WORK $5
$: INSOFAR AS IS KNOWN
""PREVIOUSLY EXPENDED
* .*
M E M 0 ii A li il u PI -----
TO : Run Seekinmi, Public Works P,dxir;r:istra.ror
FROM : Xike Little., Admiaistrative AF.sista:zt 2q Q.Q
DATE : 7ebru.ai.y 25, 1980
SCBSECT: rederal and State Drisaster3 .Assistance Acts of
12'79 -- Final Payments
The .s-C:ornla in 1-97 8 i?esul-ted ii? ooci-lappkg darrlage under. the Federal D! saster Assistance Act and the State Na-tuyal Disar;!:el.
Assis-tarice Act o The ailjitgrs hsve j:e~ie~ed and ac:<?.:~-~ed e
'Tile 'final pzymerits rec?j_veci were :
iginal ~e2~es-i-s and final Fay!ncni-s have been ?-wcc:i.veh,
FDM - $ 5 1.1 4 ?.t 7 3 State - 31,339
Total- $8G ,412
copies of the i? i.t2cance riotices sho1iring t7;e peri-ods in\ro1vE:i:
ape :it4cach.<:c!.. A:i.so provrided ay'z a.ll the filss tha-t I ].Lave
retained for) -the project. Please ;",(?e these -records filcd j-11
you^ depar-tment for i'ctu.r.e ref e~ence I
T.'l:iIL : I:: 3 p
cc : City !.'znz.ger c1-t-y Clic-:Y)k&P
I 7. ~naj-1~~2 r).iyector.
c
d a
NATIONAL .ENCOWMENT FOR YHE HUWANl'fiES
W*SHIYGTOI\' D C 20903
ASSURk?KE OF COMPLIAKCE w ITII
N3TIOSAL FOLXQATIOS CY TdE ARTS AXE I~IMANITIES
REGUU'rIONS L'hQEX TITLE VI OF n<~ CIVIL RIG~~~S ACT OF 1964
...... c?!%s???. CITY. L?I)?!lRY.. ......................... .(hereinafter called the "Applicant") !ICF,ESY ACXICES TiMT it will comply with Title \'I of the Civil Rirhtq
Regulations of the NationdFounda'iion on the Arts and :he Ilumanities (45 C.F.R.
Part 1110) issued pursuant to that Title, to the end that, in accordance with
Title VI of that Act and the regulations, no person in the United States shall,
on the ground of race, color, or national origin, be excluded from participatim
in, be denied the benefits of, or be otherwise subjected to discrimination undei
any program or activity for which the Applicant receFves Federal financial
assistance from the Foundation; and HEREBY GIVES ASSURAXCE TPAT it will
imediately take any measures to effectuate this agreement.
If any real property or structure thereon is provided or improved with the aid
of Federal financial assistance extended to the Applicant by the Foundation,
this assurance shall oaligate the Applicant, or in the case of any transfer of
such property, any transfcrec, for the period during which the real property or
structure is used for a purpose for which the Federal financial assistance is
extended or for another rlirpose involving the provision of similar services or
benefits. If any personal property is $0 providtd, this assurance shall obliga
t-he Applicant for the period during which it retairis ownership or possession of
the property, In all other cases, this assurance shall obligate the Applicant
€or the Fsriod during which the Federal financial assistance is extended to it
by the Foundation.
THIS ASSiRAKCE is given in consideration of and for the purpose of obtaining
any and all Federal. grants, loans, coEtracts, property, discounts or other
Federal financiai assistance extended after the date hereof to the Applicartc
by the Foundation, including instailncnt paynents after such date on acco~~it
of applications for Federdlinancial which were approved before such date.
The Applicant recognizes and agrees that such Federal financial assistance
will be extended in reliance on the representations and agreements made in
this assurance, and that the United States shall have the right to seek
judicial enforcemnt of this assurance. This assurance is binding on the
Applicant, its successors, transferees, and assignees, and the person or
pcrsons whose signature appears below is authorized to sign this assurance
on behalf of the Applccant.
8 Act of 1964 (47, U,S.C, 2OCOii) and all rcquircmnts iqosed by or pursuant to the
Dated.. .. I-'.ebWarY. 2.6.8. .IC??O.. ... . CARLSBA? CITY LIERARY
(App Iicmt)
By .e ..................................
(President, Chairman of the Board, or
...............................
I rank Aleshj,re, City Elanseer 5$$#&*<+sc ,Y (&tad& /" 9
. ............................... 1250 Flm Avc.r?iie
o D $?:+?he GO. * . . ?269?. L) a. 0 * .
~~plicant's rn-iiljng address
conparable authorized official)