Gibbs Sta DCEC-CS 940404 DA, ,Vl. DOWDEY AND ASSOCIATES, 3.
C,V~ ENGINEERS
16250 DALLAS PARKWAY SUITE 100
DALLAS, TEXAS 75248
(2~4) 931-0694 FAX (2~4) 93~-9538
April 4, 1994
Mr. Kenneth Griffin, P. E.
City Engineer
City of Coppell
255 Parkway Boulevard
Coppell, Texas 75019
Dear Ken:
Attached is documentation to support the letter of map revision for
Denton Creek at Gibbs Station. Please review this information and
forward to FEMA. This revision is considered fee exempt. If you
have any questions please call Allen J. Harts at 931-0694.
Sincerely,
Allen J. Harts, P. E.
AJH;jrb
Enclosure
REVISION REQUESTOR AND COMMUNITY OFFICIAL FORM I £.~,res:~-3; ;99~
I
PUBLIC BURDEN I)ISCI.OSURENOTICE
," ~,~:., :c" .-;.a.'.,'~ ;,'~g ':~urdcn' f'or thi~ t~r n: ~s esti::;a'.ed to a~ crage _.9 13 hours ,~er res~,mse. The burden estimate ':nc~udes' ' '~'~,.~-
._~:nc I',~r r~vic~,~:~ ;nstruct[,m~. ~cur'ch!n~ ,-,':<':~,,' data sources. ~atherir:~' ~:':d n:~int~ini",, tko needed dat~ and
c.,mp (.,{rig art,'{ r'(:~ :,'~n~ he h,rm ~-nd c,,~:;:tt,i.r:,s regarding
Jr,,. ...... ~ ...... C.,]k. cti,)r:~ Management. Fcder,~l I~mergt:nc) Mana~emc-,tt Agency. 5,'~ , C
tl]4~i. W~sh~n~t~,n: I)C 20503
1. OVERVIEW
] '[ hr- bd$iS ~;,r t}l[~ rev[stun request ts 'are, , c~e,:-~ a!:' that ~ Physical. change
~ Proposed
~ Improved dat~
~ F'.o.dwa~ revision
~ Other
Explain
4. FI']MA zcme des;gna'.... .ions affected: F: C
~example A, AtI,AO, AI-A30, A99, AE, V, VI-30, VE, B,C,D,X~
5 The NFIP map pan&s; alTec'md ~br ali impacted communities is ~are)
Community Community Nl~o Pane[ Efibct[ve
No. Name Count) State N .... No. Date
EX: 480301 Katy,City Ilarris, Fort Bend TX 48030~ 000SD 02,"08i83
4802S7 Ilarr~s Count; tlarr[s TX 48201C 0220G 09/28,-'90
6. The a:'et,. ,'d' :'cv:.:i ,n encomoa:~se~- the '.',,i %wing types o.~l'iooding, structures, and associated disciplines: "check att
tJ:.c;.t ~p~.?[.'. '
'l'vpes of' I"l,:,,'~di n e' Structures D~seip][nes*
.I--M Rive:'inc '~ Channel!zat;.on ~1~ Water Resources
~ Coa.-.,a '~] l.evee/Floodwall ~ t lydro!ogy
~ .\]~dvi.,~! Fat: ~ 13ridge..'CuIvert ~ lfydra~!ics
~ Sba!lo',-I"',u,.,d~ng e.q Z,,n,.'s-~()cr.:'AH. ~ I)am ~ Sed~ment'I'ransport
~ l.akc~ ~ Coasta~. ~ Inter,or Drafnage
~ Fill ~ Structura~
Affected by m
~ Pump Station ~ Geotechnica!
wind;wave action ~ .None ~ l,andSurveying
~ Yes ~ Channel Relocath)n ~ Other,'describe.'
~ No ~ Excavation
~ Other~describe~
~ Other~describe1
* Attach completed "Certification by Registered Professional En~neer and or Land Surveyor" Form for
each discipline checked. ~Form 2~
~. FLOODWAY INFORMATION
7. I),~t.= the ai'Yect~d ~qoodin~ source hu~e,t floodwu) deMg'nated un the effective FIRM or 1"BI-'M? ~ Yes ~ No
8. I) ~es the re;!sed ~q,mdway delineation differ from that shown on the effective FIRM or FBFM ~ Yes ~ No
If)es. give reason: ,., '. : ..... ~-[ ~ .........
FE2.1~ Fo~m 81 89. AGG 93 Revision Requestor and Community O~iciai Form Form 1 Page 1 of 4
Attach copy of either a public notice distributed bv the community stating the community's intent to revise the
floodway or' a statement by the community that !t has notified all affected property owners and affected adjacent
.jurisdictions.
9 Does the State have jurisdiction over the floodway or its adoptZ, n by communities participating in the NFIP?
[] Yes [] No
Ifycs, attach a copy ora letter n,,~ ;l'ying the appropriate State agency o£the fim,dwav revision and documentation o!'~he
apprw, a! of the revised floodway by the appropriate State agency.
3. PROPOSED ENCROACHMENTS
!0 With Iloodways:
1A. l)oes the revision request involve fill, new construction, substantia! imp:'o~ ement, or other deveh:pment
in the floodway? [] Yes [] No
I B. Ifyes, does the development cause the 100-year water surface elevation t~, increase at any location by more
than 0.000 feet? [] Yes [] No
I i. Without floodways:
2A. Does the revision request involve fill, new construction, substantia', improvement, or other development in
the 100-year floodplain? [] Yes [] No
2B. Ifyes, does the cumulative effect ofall development that has occurred since the effective SFIIA was
originally identified cause the 100-year water surface elevation to increase at any location by more than
one foot (or other surcharge limit if community or state has adopted more stringenl criteria;'? [] Yes [--[No
If the answer to either Items 1B or 2B is yes, please provide documentation that all requirements of Section 65. ! 2 of the
NFl P regulations have been met, regarding evaluation of alternatives, notice to individual legal property owners,
concurrence oFCEO, and certification that no insurable structures are impacled.
4. REVISION REQUESTOR ACKNOWLEDGMENT
12. I laving read NFIP i{.egulations, 44 Cl"l{ Ch. 1, parts 59, 60, 61, and 72, I believe that the proposed revision [] is
[] is not in compliance with the requirements ofthe aforementioned NFIP Regulations.
5. COMMUNITY OFFICIAL ACKNOWLEDGMENT
13. Was this revision request reviewed by the community for compliance with the community's adopted floodplain
management ordinances? [] Yes [~] No
14. l)oes this revision request have the endorsement of the community? [] Yes .~. No
If no to either of the above questions, please explain:
Please note that community acknowledgment and/or notification is required for al! requests as outlined in Section 65.4
~,b) of the Ni"IP Regulations.
6. OPERATION AND MAINTENANCE
15. Does the physical change involve a flood control structure (e.g., levees, P, oodwul ',,, cimnnelization, basins, damsY?
[]Yes [] No
Ifyes, please provide the Following infi,rmation for each of the new flood contr,,l structures:
A. Inspection ofthe flood control project will be conducted periodica'.!y b3
entity
with a maximum interval of m,,nths between inspections.
B. Based on the results ofscheduled periodic inspections, appropriate maimenance of the flood control facilities
will be conducted by
to ensure the integrity and degree of flood protection of the structu:'e
C. A formal plan ofoperation, including' documentation of the flood warning sy.-.tem, specific acthms and
a.*.'signments of responsibility by individual name or title, and provi.Mons :k,r testing the p!an at intervals
not less than une year, [] has .r~ has not been pr'e,.)ared for thc i'hmd control structure.
Revision aequesto~ and Community O~oal ~o~m Form 1 Page 2 o! 4
I). The community is willing to assume responsibility for [] performing'
maintenance and operation plans
flood control structure, l£not pcrf, r:::cd pr,)mpt!y by an owner other than the community, the community
will pruvide the necessa:'.~ se:'~ ice~- w'[thoc, t cast to the Federal gu~ernn;cnt.
Attach operation and maintenance plans
7. REQUESTED RESPONSE FROM FEMA
16 After examining the pertinent NFl l~ regulations and reviewing the document entitled "Appeals, Revisions, and
Amendments to Flood Insurance Maps: A guide for Community Officials," dated January 1990, this request is rot
a:
__a. CLOMR A letter l'ro~n FEMA commenting on whether a proposed project, ifbui!t as proposed, would
justin' a map revision r I, OMR or PMR), or proposed hydrology changes (see 44 CFR Ch. I,
Parts 611.6,5, and 72:.'.
'X b. I,OMR A letter frmn FEMA officially revising the current NFIP map to show changes to floodplains,
floodways, or flood elevations. LOMll. s typically depict decreased flood hazards. (See 44 CFR
Cit. I Purls 60 and 65.
c. PMR A reprinted NFIP map incorporating changes to floodplains, floodways, or flood elevations.
Because orthe time and cost involved to change, reprint, and redistribute an NFIP map, a
PM R is usually processed when a revision reflects increased flood hazards or large-scope
changes, tSee 44 CFR Ch. I, Parts 80 and 8,5.)
d. Other: Describe
8. FORMS INCLUDED
I 7. I"orm 2 entitled, "Certification I~y Registered Prol'essional Engineer and/or l,and Surveyor" must be submitted.
The following fi~rms should be included with this request if(check the included forms):
· ltydrologic analysis for flooding source differs from that [] Hydrologic Analysis Form
used to develop FIRM (Form 3)
· }lydraulic analysis for riverine flooding differs from that [] Riverine llydraulic Analysis Form
used to develop Fl RM (Form 4)
· The request is based on updated topographic [] Riverine/Coastal Mapping Form
inror,nation or a revised floodplain or floodway (Form 5)
delineation is requested
· The request involves any type ofchannel modification [] Channelization Form {Form 6)
· The request involves new bridge or culvert or revised [] Bridge/Culvert Form
analysis oran existing bridge or culvert {Form 7)
· The request inw~lves a new revised levee/floodwall 1~ l.evee/Floodwall System Analysis Form
system (Form 8)
· The request involves analysis ofcoastal flooding [] Coastal Analysis Form (Form 9)
· The request involves coastal structures credited as [] Coastal Structures (Form 10)
providing protection from the 100-year flood
· The request involves an existing, proposed, or modified [] Dam Form (Form 11)
dam
· The request involves structures credited as providing [] Alluvial Fan I"looding Form
protection from the 100-year llood on an alluvial fan {Form 12)
Revision Requestor and Community O'rhOal Form Fo~m 1 Page 3 of 4
g. INITIAL REVIEW FEE
18. The minimum initial review fee for the appropriate request category has been included. [] Yes [] No
Initial fee amount: $ r'¢'C ,7 ~F,.,d T
METI IOD OF PAYMENT {Check one box)
CARD NUMBER
[] PAYMENT [] VISA []MASTERCARD
ENCLOSED
Check or money order only.
Make payable to 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1t3
National Flood Insurance Program
EXP. Date
or
19. This request is for a project that is for public benefit and is intended to reduce the flood hazard to existing
development in identified flood hazard areas as opposed to planned floodplain development. [] Yes [] No
or
20. This request is to correct an error or to include the effects of natural changes within the areas of special flood
hazards. [] Yes [] No
Note: I understand that my signature indicates that all Note: Signature indicates that the community
information submitted in support of this request is understands, from the revision requester, the
corre~~~~. ~ inimpacts°ftherevisi°n°nCl°°dingc°nditi°nStheco~unity: ~
S~gn~e of Re~,s~on Requester S umty Ofhoal
Printed Name and Title of Revision Requester Printed Name and T~tle of Commumty Ofhcial
Company Name Commumty Name
Date Date
Does this request impact any other communities? [] Yes [] No
lfyes, attach letters from all affected jurisdictions acknowledging revision request and approving changes to floodway,
if applicable.
Note: Although a photograph of.physical changes is not required, it may be helpful ['or FEMA's review.
Revision Requestor and Community Official Form Form 1 Page 4 of 4
~EDERALE'MERGE'"'Cv%'A%AG£ME%-AG£'~Cv OMB BurOer',.%o 3067-0148 FEMAUSEONLY
CERTIFICATION BY REGISTERED PROFESSIONAL ENGINEER Exp,resJ~.iy 3!. 1994
ANDtOR LAND SURVEYOR FORM
PUBLIC BURDEN DISCLOSURE NOTICE
Public reporting burden for this form is estimated to average. 23 hour per response. ]'he burden estimate includes thc
time for reviewing instructions, searching existing data sources, gather:.ng and maintaining the needed data, ~nd
completing and reviewing t}'.-, form. Send comments regarding the accuracv of the burden estimate and an.','
suggestions for reducing this burden, to: Information Co.~ec.~ons .Managemen.t. l"edera! Emergency Management
Agenc.~, 500 C Street, SW., Washington, I)C 20472; and to the Office et' Management and Budget, Pape,,'work
Reduction Project (3067- 0148}, Washington, I)C 20503.
1. This certification is in accordance with 44 CFR Ch. I, Section 65.2
2. I am licensed with an expertise in ~'q°fec ['..... :.~ ..... : :_ ...... )
lexample: water resources :'hydrology, hydraulics, sediment transport, interior drainage? structural,
geotechnical, land surveying. I
3. I have years experience in the expertise listed above.
4. (have []prepared [] reviewed the attached supporting data and analyses re!ated to my expertise.
5. I [] have [] have not visited and physically viewed the project.
6. In my opinion, the following analyses and/or designs, is/are being certified:
7. Base upon the following review, the modifications in place have been constructed in general accordance with plans
and specifications·
Basis for above statement: (check all that apply)
a. [] Viewed all phases ofactual construction.
b. [] Compared plans and specifications with as-built survey information·
c. [] Examined plans and specifications and compared with completed projects·
d. [] Other
8. All information submitted in support ofthis request is correct to the best of my knowledge. 1 understand that any
false statement may be punishable by fine or imprisonment under Title 18 of the United States Code, Section 1001.
(please print or t>'pe~
(please print or type~
Registration No. '~. '2.~' .~' "' Expiration Date' :; [ ~* I i. ] 'L
State '?
1 vpe of I ~ , ·: I ~
. Acense ..... . ~: - .. .... ·
Seal
*Specify Subdiscipline ~Opt~w-,at>
Note: Insert not applicable (N/A) when statement does not apply.
FEMA Form 81-89A, AUG 93 Certmcat~on by Registered ~rofe~ional
Engineer and;or Land Surveyor Form Form 2
FEDERAL EMERGENCY MANAGEMENT AGENCY OMB SurcienNo 3067-0148 FEMAUSEONLY
RIVERINE/COASTAL MAPPING FORM Exp,res.".i~ 3? !994
PUBLIC BURI)EN DISCLOSURE NO 1'1(:1~.
Public reporting burden for this form is estimated to average 1.5 hours per re~-p,:,nse The burden estimate includes the
time for' reviewing instructions, searching existing data sources, gathering ~nd maintaining the needed data, and
completing and reviewing the form. Send comments regarding the accuracy of thc bm'den estimate and any suggestions
lS~r reducing this burden, to: Infi~rmation Collections Management, Federal Emergency Management Agency, 500 C
Street, S.W., Washington, I)C 20472; and to the Office of Management and Budget, Paperwork Reduction Project (3067-
0148h Washington, I)C 20503.
1. M~PPI~ CHAN~ES
1. A topographic work map of ~uitable ~cale, contour interval, ~nd pl~nimetr[c definition must be submitted showin~
(ind[cale N..'A ~hen nul applicable,': lnclude~
A. Revised approximate l00-year floodplain boundaries (Zone A) ............ ~ Ye~ ~ No ~ N/A
B. Reviseddetai]edl00-~ndS00-yearfloodplainboundaries ................ ~ Yes ~ No ~ N/A
C. Revised l00-ze~r floodway boundaries ................................. ~ Yes ~ No ~
D. [.coition ~nd alignment of all cross sections used in the revi~ed
hydraulic model wi[h stationin8~ontrol indicated ....................... ~ Yes ~ No ~
~. 8Lre~m ~li~nments, road and dam ali[nment~ .......................... ~ Ye~ ~ ~o ~ ~/A
F. Current communit~ boundaries ....................................... ~ Yes ~ No ~
O. BffecLive 100- and 500-year floodplain and 100-year
boundaries from the FIRM/FBFM reduced or enlarged to the
scale ofthe topo[raphic work map .................................. ~ Yes ~ No ~ N/A
II. ~ie-ins between the e~ective and revised 100- and 500-~ear
floodplains ~na 100-year floodway boundaries ......................... ~ Yes ~ No ~ Nh~
I. The requestor's property boundaries and eommuniLy e~sements ......... ~ Yes ~ No ~ N/A
~. Thesi~nedcertific~Lionofare[isteredprofessionalen~ineer ........... ~ Ye~ ~ No ~
K. I,ocation and description oFre~erence marks ........................... ~ Yes ~ No ~ N/A
I,. VerLicaldatum(example:NGVl),NAVI)etc.) ........................ ~ Yes ~ No ~
M. Coastal zone desidnaLions Lie into adjacent areas not bein8revised ....... ~ Ye~ ~ No ~
~. l,ocation and ~li~nment ofall coastal transects u~ed Lo revi~e the
coastal analyses .................................................... ~ Yes ~ No ~ N/A
IfanyoftheitemsabovearemarkednoorN/A, plea<,, explain: T¢~ F~E,~ ,,~.,f ~.
2. What is the source and date ofthe updated topograph? information (example.. orthophoto maps, July 1.9,q,5; riehl
suruey, May 1979, beachpro~les, June 191q7, elc.)? u,~y ..{ c:.fl,c ii ,~.{,~3(--~h,c .... /~ (
3. What is the scale and contour interval ofthe fi~llowing work maps?
a. Effective F18 scale Contour interval
b. Revision Request I' :;:~ scale ~' Contourin[erval
NOTE: Revised to,graphic information must be of equal or greater detail.
4. Attach an annotated FIRM and FBFM at the scale orthe effective PI RM and I,'BFM showing the revised 100-year
and 500-year floodplains and the 100-year floodway boundaries and haw they tie into those shown on the
I"IRM and FBI"M downstream and upstream ofthe revision or adjacent to the area of revision rot coastal studies.
Attach additional pages if needed.
FEMA Form 81-89D, AUG 93 RiverineiCoastal Mapping fo[m t o~m 5 Page
1. MAPPING CHANGES (Cont'cl)
5. Flood Boundaries and 100-year water surface elevations:
I las the 100-.year floodplain been shifted or increased or the 100-year water surface elevation increased at an)'
location on propert.v other than the requestor's or community's ? [] Yes [] No
ifyes, please give the location ofshift or increase and an explanation fi~r the increase.
a. l lave the affected property owners been notified ofthis shift or increase and the effect it will have on their
property? ........................................................... [] Yes [] No
If yes, please attach letters from these property owners stating they have no objections to the revised flood
boundaries ifa LOMR is being requested.
b. What is the number of insurable structures that will be impacted by this shift or increase?
6. Have the floodway boundaries shifted or increased at any location compared to those shown on the effective
FBFM or FIRM? ......................................................... [] Yes [] No
If yes, explain:
7. Ifa V- zone has been designated, has it been delineated to extend landward to the heel of the primary frontal
dune? [] Yes [] No
Ifno, explain:
8. Manual or digital map submission:
[] Manual
[] Digital
Digital map submissions may be used to update digital I~'IRMs (DFIRMs). l~'or updating I)FIRMs, these
submissions must be coordinated with I?i~MA lleadquarters as far in advance ofsubmission as possible.
Riverine/Coastal Mapping Form Form 5 Page 2 of 3
2. EARTH FILL PLACEMENT
1. The fill is: [] Existing [:-] Proposed
2. llas fill been/will be placed in the regulatory floodway? ...................... [] Yes [] No
If yes, please attach completed Riverine Hydraulic Analysis Form.
3. I las fill been/will be placed in floodway fringe (area between the floodway
and lO0-yearfloodplain boundaries)? ..................................... [] Yes [] No
lfyes, then complete A, B, C, and D below.
A. Are fill slopes for granular materials steeper than one vertical
on one-and-one-halfhorizontal? ....................................... [] Yes [] No
If yes,justify steeper slopes
B. Is adequate erosion protection provided for fill slopes exposed to moving flood waters? (Slopes exposed to
flows with velocities of up to 5 feet per second (fps) during the lO0-year flood must, at a m in im urn, he
protected by a cooer of grass, vines, weeds, or similar vegetation; slopes exposed to flows with velocities
greater than 5 fps during the lO0-year flood must, at a minimum, be protected by stone or rock riprap.)
.................................................................... [] Yes [] No
If no, describe erosion protection provided
C. I Ias all fill placed in revised ! 00-year floodplain been compacted to 95 percent of the maximum density
obtainable with the Standard Proctor Test Method or acceptable equivalent method? [] Yes [] No
D. Can structures conceivably be constructed on the fill at any time in the future? [] Yes [] No
lfyes, provide certification of fill compaction (item C. above) by the community's NFIP permit official, a
registered professional engineer, or an accredited soils engineer.
4. Itas fill been/will be placed in a V-zone? [] Yes [] No
If yes, is the fill protected from erosion by a flood control structure such as a revetment or
seawall? [] Yes [] No
Ifyes, attach the coastal structures form.
Riverine/Coastal Mapping Form Form 5 Page 3 of 3
'!' :i hi NATIONAL FLOODINSURANCEPROGR
J~il'l[ J: i,,j SPECIAL BY 100-YE,kR FLOOD FL OOD HAZARD AREAS INLNDATED
~ ZONE A No base flood e~e',alions determ, ned.
~'J'"/il!l ZONE AE Ba~e flood ele~at:ons determined.
jj:: . ZONE AH Fiood aep!h~, of 1 to 3 feet iusL;a[N areas
ti' "q'J"q 'J FIRM pond'm~' base :,ood ele,.ations deTerm:ned._.
P..' i' I.. ZONE AO F:ooddepthsoflto3,~ee:
on slopir'~ terrain., a',erage dept%
FLOOD INSURANCE RATE MAP mined. FOr areas ot alJuv[a! fan i'ood, ing.
. . ~e!oci,'ies a:s(; determined.
d ZONE A99 To ~e protected ,rom lO0-year iiood b',
~I~M~jll Federal flood pr,-'J!e('lion s~,ste ..... de' con-
slrt;ct~oq, no b.l,,e flood eJe',at:on,~ dele'-
STREET INDEX
ZONE V Coas'al flood ~;.:J', ',-e!ock? ~azard .wa,.e
ao:ioq., ba:,e ilood e!e,.afion,,
COPPELL, FLOOD~,%'AY ARE,\S I'x ZONE -~E
TEXAS
DALLAS AND DENTON COUNTIES j J OTHER FLOOD AREAS
ZONE X -~reas ."d 3OO-.ear !lood: area~ o,~ 1OO-;-ear
flocxJ ?.~:~ a'.erage de:~d's oi !ess :hah I fool
w~th dr,ama~4e areas ~ess d:a.," 1 sq'.Jare
ONLY PANEL PRINTED ~,,, ~;eas :'~rot,','.ted b, [e~,ee,~ ;,rom
,:.:~ MAP LOCATOR DIAGRAM
· 0~a: [-- j OTHER,REA$
: ZONE X 's,'e,.l-', dot er m. r'ed !o be ogtside 500- · ,:'a r flood-
[ p{ai~
~ ZONE D A'eas i~ ~'.q:,,'h q,aod hazarc', ar~' .Jqde[e'.
L%D[\ EkOP[D COA$1-~k
F oodp!a!rx Bc;~Jndar~
· -- F!oodv, a~ Bou"d,tr ¥
'PAN!L .NOT PqJNTED-NO SPeCIAl. FLOOD NAZARI:) '
AREAS /oqe D Boardar;
COMMUNITY-PANEL NUMBER
480170 0010 D zo,,,, ar:(., 8our,(l..Jrv Dlvidlr,~[ A.i'e~15 o~ Dli'-
fereqt Coa,,!~l Ba~e F!ood Ele,.,:t,ons ~,%Jrh
5pe~ia: Flood Hazard Zone;.
MAP REVISED: ~513 Base F!ood E:e,,a:io¢ Line. [.e, atioq ir- Fee!'
(EL 987~ Base Flood Ele~al o~' i, Feel ~%here
~.% Rhin Zone'
RS 7x Ele,,ado~ Re;erep¢'e Mark
')RATE
LIMITS
J .M 1.5 Ri,er Mi;e
· : ~ ~,~:mer-enc',.- s -~'~ana"emen*.-o .ioencv 'Referenced :o (he '~ational Geode,c Vertical Dal .... oi
Federal
NOTES
n
NATIONAL FLvdD INSURANCE PROGR
SPECIAL FLOOD HAZARD AREAS INUNDATED
" BY 100-YEAR FLOOD
::""" FIRM ~ndin~,;Fl°°ddep'~s°f'~°3fee~(usuallyareas°~
~ Z ON E AO Flood dep~h~ of 1 ~o 3 fee~ (usually ~heer flo~
FLOOD INSURANCE RATE MAI) o, ~,opinK Terrain): ave-a~ ~e~t"s de:er-
mi~ed For areas .of alluvial ~an flooding.
Federal flood prote~ion ~slem unde~ co'~-
ERENCE ELEVATION
IAARK IN ~. (NGVD)~ DESCRI~ION C ZONE V Coastal qood ~[t~ ~e'ocH', ha;a-d
bridge on Sandy Lake Bead ov,
1~8 460.~1 Chiseled square on top of whee DALLAS A~D DE~O~ COUNTIES J j OIHER FLOOD
Of brid~e on ~elt kine ~oad ovf -" '''~ ~Offi fi X qreas o' 5~-~ear flood: areas o~
doo~ with a~erage dep:~s o~ ess than 1 ~oe:
199 ~7.17 Chiseled square on top of whee ONLY PANELPRINTED ~,,= drainage areas less tha, 1 square
of bridge on Denton Tap Road and ~re~s protected b~ ';e~ees ~rom :~-zear
200 510.71 Chiseled square on top of whe~ ~J
of bridge on Freepo~ Parkway I I OTHER AREAS
I
ZONE X &re~ determ.qed to be o ~T~ce 5C~-' ear ~1oo~-
201 478.80 Standard U.S. Geological Surv~ pi~ n.
set in east end of no~h abutmm ZONE D A-o,~, m ~.~(.h qood hazard~ Jrt' uncle'er-
over Denton Creek. n~iqe(J
~ Nstional ~eodetic Ve~ical Datum of 192~. L %DE% ELOPED COASTAL BARRIERS-
~UMMUNI/T'ffANEL NUMBER ~ tc ..... ~b ...... . ........ e no ..... oca~ed ~,T-,n or ad;acent To spec~l :'ogc
480170 0010 E = ..... ~ area,
MAP REVISED: ~ ,.oo.~,,~, ~o~pdar~
~ Zone g
APRIL 15, 1994
[ 8o,~nda~> Di~ding Special [~ood
, Zones. and Boundar~ Dmvmding &reas oi Di'-
J ferent Coasial Base Flood Elevations ~i:hi-
Special Flood Hazard Zones.
~ 513~ Base F~ood Elevation Line: Elevation in Feet'
F~e~! Eme~ency M~agement ~ency ~ ~ Cro,, ~ion Line
{ E L ~87~ Base F.ood ~levalion ,n Fee~ ~Xhe,e L'ni~o,m
~ ~ 7X E]e~auon Re;erence N~ark
~ 'M 1.5 River