FIRM-92060494Le- If 6�
L�l 1`7 FILE COPY P.O. Box 478
Coppell, Texas 75019
fhe City With A Beautiful Future 214- 462 -0022
June 4, 1992
Mr. William R. Locke
Chief, Risk Studies Division
Federal Insurance Administration
Federal Emergency management Agency
500 C Street, Southwest
Washington, D.C. 20472
Re: Revisions to FIS /FIRM /City of Coppell
Dear Mr. Locke:
This letter serves as the City of Coppell's formal appeal of flood
elevation determinations, according to Part 67 of Title 44 of the Code of
Regulations (44CFR). We have completed our detailed review of the
preliminary Flood Insurance Study (FIS) and the Flood Insurance Rate Map
(FIRM), dated December 18, 1992. In addition, we have coordinated the
review with affected consultant engineers who have previously prepared
floodplain studies for certain subdivision developments adjacent to flood
hazard areas. We are providing you with the best available documents and
plans reflecting existing conditions to support our appeal.
Please note that one of the City's mayor concerns is the incorrect
floodplain line delineations which impact some properties that are in fact
outside of the flood hazard areas. The floodplain work maps previously
provided to FEMA, by Morrison Hydrology Engineering on behalf of the City,
were partially inaccurate, since the base maps used were the 1985 City
topo maps. Recognizing the fact that over the past seven (7) years we
have experienced a tremendous amount of growth, the 1985 topo base maps
used did not reflect the existing grading conditions. This matter hasp
caused a great deal of concern and it is our intent to work with your
staff to update the FIRM according to the best available data.
It is important to note that the City of Coppell is presently in the
process of developing a base map which will provide accurate information
reflecting the City's corporate limits, street locations, topos, etc. It
is our intent to provide FEMA with the City's most accurate street and
topo maps on a scale of 1" = 1000' by September, 1992. The maps should
address concerns of several property owners who believe their properties
are incorrectly shown in flood hazard areas.
Letter to Mr. William R. Locke
June 4, 1992
Page 2
Enclosed please find the necessary supporting documents provided for areas
along Cottonwood Branch, Denton Creek, Elm Fork of Trinity River and
Grapevine Creek. The attached summary report provides a brief explanation
of our concerns and information submitted, entitled "Revisions to FIRM /FIS
- 1992 ", pages 1 thru 6 of 10.
Also attached is the flood prone street index reflecting staff's comments
in regard to the street and grid locations, see attached page 7 of 10.
Also attached are copies of the revised pages of the FIS, dated 12- 18 -91,
reflecting changes such as our current population estimates (19,250) and
geographical size (13.5 sq. miles), etc. See Page 8 thru 10 of 10.
We respectfully request your favorable consideration of our appeal and
that the enclosed documents be carefully reviewed prior to finalization of
flood elevation determinations. Our staffs have worked together on
previous FIS /FIRM revisions and the continued coordination is greatly
appreciated.
If you have any questions and /or need any additional information please
contact M. Shohre Daneshmand, P.E. or myself at (214) 393 -1016.
Sincerely,
4nneth M. 'G 3. ivff n, P.E.
d ,qty Enginee
-- -__
KMG /MSD /bd
cc: Alan D. Ratliff, City Manager
William A. Anderson, P.E., Dan M. Dowdey Associates, Inc.
+% M. Shohre Daneshmand, P.E., Civil Engineer
Phil Deaton, P.E., Carter & Burgess
Bill Wallace, P.E., Nathan D. Maier
Robert Porter, P.E., Don Tipton Engineers
Jean Hansen, P.E., Albert H. Halff Associates
Kevin Kendrick, P.E., Unzicker, Schnurbusch Associates
REVFIS
REVISIONS TO FIRM %FIS - 1992
COTTONWOOD BRANCH
IC - Oakbend Addition
Attached please find a copy of the final plat for this subdivision to
delineate correct street locations. There was no alterations made to
the designated flood hazard area under this development. A copy of
the report had been provided to FEMA for references only. (Plans
prepared by Nathan D. Maier Consulting Engineers.)
2C - Shadow Woods Estates
Attached is a copy of the final plat for this subdivision to
delineate correct street locations. A floodplain study by Nathan D.
Maier Consulting Engineers had been forwarded to FEMA for review.
(See attachment 2C -A, letter from FEMA dated 10%1689.)
3C - Villages of Cottonwood Creek
The floodplain and floodway delineations are incorrect, and appear to
be a drafting error. A certified copy of the 'As-Built" grading plan
for this subdivision prepared by Wier & Associates, Inc. is provided
for your use in correcting this error. This subdivision was
constructed in January, 1986. The correct floodplainjfloodway line
is also delineated on a copy of the FIRM, noted as 3C.
e4C - Parkway Blvd Extension West /Coppell High School
Approximately 560 T.F. ( +) of Parkway Blvd. is extended west of
Denton Tap Road to provide access to the Coppell High School (CHS).
Also, a certified existing grading plans (record drawings) for the
CHS, as prepared by SHW Group, Inc., dated June 9, 1988, is enclosed.
Page 1 of 10
REVISIONS TO FIRM /FIS - 1992
DENTON CREEK
D - City of Coppell's Corporate Limits in the Vicinity of S.H. 121 and
Denton Creek:
op-
Attached annexation Ordinances #88410 &
Ordinance #91504 fare provided in support
limit line in the vicinity of S. H. 121
attached City limit map (scale 1" _
corporate limits in this area.
1D - Park Meadows Section I & II
88427 OW and disannexation
of changes made to the City
and Denton Creek. The
1200') reflects the correct
Some of the streets currently shown on the FIRM are incorrect.
Attached final plats, for Park Meadow Section I and Section II, are
provided for correct delineation of certain streets, such as Clear
Haven, etc.
2D - MacArthur Blvd Bridge Crossing Denton Creek
Attached are "As -Built Plans" for the MacArthur Blvd. Bridge along
with a letter from Mr. Phil Deaton, P.E., Carter & Burgess Inc.,
dated June 4, 1992, regarding "Vista Ridge Development" along with a
grading plan for "Island Area Along MacArthur Blvd., Exhibit "A ". In
his letter Mr. Deaton appeals that the island area along MacArthur
Blvd. between the old Denton Creek and the new flood control channel
is outside of the 100 -year flood hazard area. Reference is made to
the split flow analysis that was prepared and submitted by Mr. Ron
Morrison, P.E., Case #6 -89 -236, letter dated September 5, 1990. (See
attached documents.)
10'3D - Lakes of Coppell /Villages of Coppell III & IV (Phases A & B)
The floodplain line is delineated incorrectly in this area. The
flood hazard area south of Deforest Lane is narrower than shown. The
effective FIRM (dated 10- 16 -91) is more accurate than the preliminary
FIRM under revision. Floodplain Study Report prepared by Don Tipton
Engineers (Case #92- 06 -037R) has been submitted to FEMA for review.
Attached final plats are submitted for correct delineation of
streets. We request that if review is completed, the final LOMR be
issued and the revision be shown on the City's revised FIRM.
i
4D - Gibbs Station
In response to FEMA's letter dated 3 -17 -92 and to support Mr. D.M.
Dowdey's request, the attached certified existing grading plans
prepared by D. M. Dowdey & Associates Inc. is provided. The FIRM
dated 10 -16 -91 correctly shows this particular area. Please note
that the base maps used by the City, in providing the previous
floodplain delineations, were the 1985 topographical maps which was
Page 2 of 10
prior to completion of Lakes of Coppell (Case #IA -RA -RS (102a)
reclamation project. During the previous map revision, to keep the
floodplain lines continueous, the old topo lines were used. However,
the as -built grading plan certifies the area to be outside of the
100 -year flood hazard area, as intended. City supports this request.
�5D - Lakes of Coppell /Lake Wood Estates
As per attached letter from Mr. K. Kendrick, P.E. of Unzicker,
Schnurbusch Associates, Inc., dated 4/28/92, the proposed floodplain
line is incorrect, as fully explained under the previous item ( #4D),
due to the City's use of old topo maps. The City supports this
request. Attached also please find the certified existing grading
plan, prepared by Unzicker, Schnurbusch Associates, Inc.
'076D - Corporate City Limit Line/T.U. Electric Easement
Attached is a copy of Annexation Ordinance #89430 as supporting
document stating that this strip of land is within the corporate
limits of the City of Coppell.
Page 3 of 10
REVISIONS TO FIRM(FIS - 1992
ELM FORK OF THE TRINITY RIVER
r
1EF- The Zone 'X' Area South of Belt line Road
A portion of the area shown as Zone 'X' on the preliminary maps dated
12/18/91 should be shown as 100 -year floodplain. It should not be
labeled a floodway because it is in an area of non effective flow.
Please see the attached copy of existing grading plan prepared by
A.H.H. & Associates and a copy of the marked -up FIRM.
Page 4 of 10
REVISIONS TO FIRM /FIS - 1992
GRAPEVINE CREEK
1G - Grapevine Creek Channelization /Drop Structure Case #92- 06-006P
Attached is additional information, including a letter from the City
regarding channel maintenance. See letters from the City, dated
6 -4 -92 and 6 -2 -92, along with A.H.H.'s letter to the City, addressing
said comments. City supports this request for issuance of the final
letter of Map Revision, and actual map revision of the area under
this appeal.
�2G - Big Cedar Addition (Tributary G -1)
Attached is an executed copy of the final plat for street location
and delineation along Tributary G -1. Please note that Bethel School
Road is no longer a public access road from the south. Also, see a
status report letter from Mr. M. Goodwin, P.E. on Case #91- 06 -70R.
If your review of this project is completed, please reflect the map
revision on the City's FIRM as part of this request.
*03G - Denton Tama Road Bridge /Case #88- 06-13R
A floodplain study for widening of Denton Tap bridge had been
submitted to FEMA in 1988. The FIS profile for the portion of
Grapevine Creek Crossing Denton flap does not show the new bridge.
Please make appropriate correction, (see attached letter from Ginn,
Inc. to FEMA, dated 11- 20 -90).
4G - Creekview Estates /Case #88- 06 -37R
The above referenced subdivision has been constructed. As per the
attached letter from Mr. William Wallace, P.E. of N.D. Maier
Consulting Engineers, Inc., the "As- Built" documents and plans are
presently being prepared. The complete "As- Built" documents are to
be submitted to FEMA in the next 30 - 60 days. See attached letter,
dated 5 -29 -92 from Mr. Wallace, P.E., along partially completed
as -built survey map. Attached you also will find a copy of the final
plat for Creekview North showing the street location, prepared by
Don Tipton Engineers, Inc.
5G - Corporate Limits of the City of Coppell
Attached is a copy of Ordinance #88412 in support of correct City
limit line in the southwest area of Grapevine Creek and Denton Tap
Road.
016G - Carter Estates /Street Delineation
Attached is a copy of the plat for Carter Estates showing the street
locations. Please make revisions accordingly.
Page 5 of 10
4OW7G - Northlake Woodlands #12
The above referenced floodplain study has been
under the previous administration. Attached is
plat prepared by Don Tipton Engineers. Please
revisions to the FIRM.
Page 6 of 10
submitted to FEMA
a copy of the final
make appropriate
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COPPELL, TX
FLOOD PRONE STREET INDEX
NOTE TO USER
This index provides a List of all streets shown on the Flood Insurance Rate Map (FIRM) that
are partially or totally within Special Flood Hazard Areas (SFHAs). This index should not be
used as an authoritative source for determining whether specific streets, properties, or
buildings are within an SFHA. The appropriate FIRM panel must be consulted for these purposes.
This index is intended to be used only as a guide for determining which FIRM panel displays
the street in question and the relative location of the street on the FIRM panel.
J- e�ls�
KEY
BAKER STREET . . . . . . . . . . . . . . . . . . . . . . 0005 (A2)
Street Name . . . . . . . . . . . . . . Panel Number (Grid Location)
• AIRLINE DRIVE . . . . . . . . . . . . . . . . . . . . .
ALLEN ROAD . . . . . . . . . . . . . . . . . . . . . . .
BELTLINE ROAD . . . . . . . . . . . . . . . . . . . . . .
BETHEL ROAD . . . . . . . . . . . . . . . . . . . . . . .
BETHEL SCHOOL ROAD . . . . . . . . . . . . . . . . . . .
0 BRE /NWOOD DRIVE . . . . . . . . . . . . . . . . . . . . .
COPPELL ROAD . . . . . . . . . . . . . . . . . . . . . .
DEFOREST ROAD . . . . . . . . . . . . . . . . . . . . . .
• DENTON TAP ROAD . . . . . . . . . . . . . . . . . . . . .
• FREEPORT PARKWAY . . . . . . . . . . . . . . . . . . . .
S•.4•3aI ........... .
LEDBETTER ROAD . . . . . . . . . . . . . . . . . . . . .
LOCH AVENUE . . . . . . . . . . . . . . . . . . . . . . .
• MACARTHUR BOULEVARD . . . . . . . . . . . . . . . . . . .
MEADOW CREEK ROAD . . . . . . . . . . . . . . . . . . . .
• MOORE ROAD . . . . . . . . . . . . . . . . . . . . . . .
RIVER CHASE DRIVE . . . . . . . . . . . . . . . . . . . .
ROYAL LANE . . . . . . . . . . . . . . . . . . . . . . .
SANDY LAKE ROAD . . . . . . . . . . . . . . . . . . . . .
• SOUTHWESTERN BOULEVARD . . . . . . . . . . . . . . . . .
STATE ROAD . . . . . . . . . . . . . . . . . . . . . . .
VILLAGE PARKWAY . . . . . . . . . . . . . . . . . . . . .
0010 (C5)
0010 (G2)
0010 kr��—�
0010 (CO
0010 (04)
0010 (G1)
0010 (65)
0010 (F1)
0010 (D3)
0010 (CS)
0010 (Cl)
0010 (H5)
0010 (CO
0010 (F1)
0010 (D4)
0010 (E3)
0010 (H3)
0010 (A3)
0010 (C2)
0010 (CO
0010 (B3)
0010 (G2)
jLto e- S er�s C �'Ci 1 eS 4 10 6:-�j
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of40MON00
110
FLOOD
INSURE
STUD
C E
CITY OF COPPELL,
TEXAS
DALLAS AND
DENTON COUNTIES
PRELIMINARY
DEC 18 1991
at 3e _... o
to
REVISED:
MAN�C�
z
.Federal Emergency Management Agency
��yo
0 b COMMUNITY NUMBER - 480170
� a�D 0 Soo
In 1980 Coppell had a population f 3,826 and in 198 , (population °F
of eference 1). Coppell is a sparsely developed residen-
tia mmunity of approximatel quare miles. The city is
drained by the Elm Fork of Trinity River and its tributaries. The
Elm Fork flows in a southern direction, while the tributaries flow
in an eastern direction.
The climate of the study area is warm, temperate, and humid.
Summers are hot, and winters and short and mild. The mean relative
humidity is 63 percent, and average temperature is 65.8 degrees
Fahrenheit (0Fa. The record temperature extremes range from a
maximum of 111 F in July 1954 to a minimum of -30F in January 1930.
Coppell has terrain characteristic of the Black and Prairie. The
topography is gently rolling to almost level with narrow streams
being well incised. The soils in the area are mainly of the Houston
Black, Haiden, and Austin series. The native vegetation consists of
bunch and short grasses with scattered mesquite trees on the uplands
and hardwood, mainly elm, hackberry, and pecan occurring along the
streams.
2.3 Principal.Flood Problems
Most of the floods producing storms that occur in Coppell are ex-
perienced in the spring and fall. Most of the higher floods that
have occurred in the general geographical region have resulted from
prolonged or successive storms that produce heavy rainfall during
this period; however, severe flooding can be produced by intense
local thunderstorms at any time.
i
Coppell has experienced few flood problems in the past, due
primarily to the fact that little development exists on the
floodplains at this time.
There are two USGS stream gages in the study area. The gage on the
Elm Fork of Trinity River located at Sandy Lake Road was established
in November 1943. The gage on Denton Creek located at Interstate
Route 121 was established in October 1947 (Reference 2). Historical
data for ungaged watersheds are dependent on local resident
observations, news media records, published reports, and analysis of
other nearby watersheds with gage data and similar characteristics.
Significant flooding is known to have occurred within the vicinity
in 1908, the early 1930s, 1942, 1947, 19492 1957) 19629 1963, 1964,
1965, 1969, 1973, 1974, 1976, and 1977; however, little specific
data is available.
Grapevine Creek and Cottonwood Branch undoubtedly experienced
flooding during the periods listed above, but no details are avail-
able.
ow 1bf to
t
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1 .r
ale
FIGURE 2: Potential Flood Height
on Grapevine Creek
This photograph shows future
flood heights on Grapevine Creek
at Moore Road.
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