Parks Coppell FS-CS 870924 Federal Emergency Manag'ement'"': ol .
Washington, D.C. 20472
SEp 2 4 !987 -'
C~IFI~ ~IL IA-~-RS (102)
R~ R~EIPT ~Q~ST~
Comm~ity: City of Cop~ll,
~e Nonor~le ~u Duggan ~nton Cowry,
Mayor of ~e City of Cop~ll Texas
P.O. ~x 478 Map Panel N~er: 480170 0005 C
Cop~ll, Texas 75019 Effective Date of
this Revision: Septe~er 24, 1987
Dear Mayor Duggan:
~is is in reference ~ a letter dat~ ~ce~er 10, 1986, and technical data
s~mitted by Ms. Shohre ~nes~and, City Civil ~gineer for the City of
Cop~ll, r~arding ~e Flo~ Instance Study (FIS) for your comm~ity. In her
letter, Ms. Danes~and r~uest~ ~at ~e F~eral ~ergency ~nagement Agency
(F~) issue a ~tter of Map ~e~ment (L~) to incor~rate complet~ channel
aD~ flo~plain modifica~ons along Denton Creek. ~e area of concern for ~is
r~uest exte~s fr~ ~nton Tap Road to ~ Forest Road. ~1 necessary materials
to process '~is r~uest ~re received as of J~e 29, 1987.
It should ~ not~ ~at a L~ is issued only ~ remove ~e S~cial Flo~
Hazard ~ea (S~) designation, sho~ on ~e effective Flo~ Instance Rate
Map (FI~), from an area occupi~ by a ~rticular st~cture if it is ~ove ~e
existing Base (100-year) Flo~ ~evation (BFE). ~cause ~is r~uest is ~s~
on a complet~ chapel modification, ~ich results in a r~uction in ~e BFEs
a~ ~e 1 00- a~ 500-year flo~plain delineations along a ~rtion of Denton
Creek, a ~tter of ~p Revision (L~) to ~e FIS, FI~, and Flo~ ~dary
a~ Flo~way Map (FBFM) is being issued in lieu of a L~. A L~ is ne~ed
to revise ~e BFEs ~ 100- a~ 500-year flo~plain delineations along Denton
Creek based on changes in ~e hydraulic ~r~eters used in ~e effective FIS,
FI~, and FBFM for your c~m~ity.
We have reviewed ~e s~mitt~ data ~at ~re prepar~ by Threadgill-~ey
Associates, ~ich included ~e following: H~-2 hydraulic modeling of pre-
a~ ~st-cha~el modification coD~itions, dat~ J~e 29, 1987; a~ topo~aphic
mapping, dat~ Sept,mher 12, 1986, representing ~e proposed changes ~ ~e
FIS, FI~, and FBFM. ~sed on ~ese data ~e BFEs and 100-year flo~way
elevations, a~ ~e 100-year (Zone A3) and 500-year (Zone B) flo~plains along
Denton Cre~ have ~en revised for a distance of approximately 1.6 miles
do~s~e~ of ~nton Tap Road. ~is L~ ~e~s FI~ a~ FBFM nu~er 480170,
panel 0005 a~ ~e FIS text, all of ~ich are dat~ Feb~ary 15, 1984. ~ese
cha~es are sho~ on ~e enclosed flo~ profile sheets; a~otat~ FIS t~t
T~le 2, entitled 'Flo~way Data"; annotat~ ~rtion of FI~ ~nel 0005 C;
a~ annotat~ ~rtion of FBFM ~nel 0005. Please note ~at ~e loca~ons
of ~e ~nton Creek cross sections B and C have ~en revised, as sho~ on
the enclos~es.
Anderson Engineers, Inc., is currently restudying several streams within the
City of Coppell, including Denton Creek; the analyses for the restudied
streams are to be submitted to FEMA by your community for our review. The
analyses will then be used as the basis for a revision to Coppell's FIS, FIRM,
and FBFM. This LOMR will be superseded by the revised FIS, FIRM, and FBFM
based on the Anderson Engineers analyses.
Public notification of this LOMR will be given in The Citizens Advocate on or
about October 9, 1987, and October 16, 1987. A copy of this notification is
enclosed. In addition, notice of changes will be published in the Federal
Register. We encourage you to supplement this notification by preparing an
article for publication in the community newspaper. This article should
describe the changes that have been made and what assistance the community can
give in providing data and interpreting the maps.
It should be noted that National Flood Insurance Program regulation 44 CFR
60.3(b)(7) requires communities to 'assure that the flood carrying capacity
within the altered or relocated portion of any watercourse is maintained."
This provision is incorporated into your community's existing floodplain
management regulations; consequently, responsibility for maintenance of the
modified channel rests with your community.
The revised BFEs are effective as of the date of this letter; however, within
90 days of the second publication in The Citizens Advocate, a citizen may
request that FEMA reconsider the determination made by this LOMR. Any request
for reconsideration must be based on scientific or technical data. All
interested parties are on notice that until the 90-day period elapses, FEMA's
determination to modify the BFEs presented in this LOMR may itself be modified.
Since this LOMR will not be printed and distributed to users such as insurance
agents and lenders, the community will serve as a repository for the new data.
We encourage you to disseminate widely throughout the community the informa-
tion reflected by this LOMR in order that interested persons may offer new
information or comments.
The determination made in this LOMR has been made pursuant to Section 206 of
the Flood Disaster Protection Act of 1973 (P.L. 93-234) and is in accordance
with the National Flood Insurance Act of 1968, as amended (Title XIII of the
Housing and Urban Development Act of 1968, P.L. 90-448), 42 U.S.C. 4001-4128,
and 44 CFR Part 65. As required by this legislation, a community must adopt
and enforce floodplain management regulations in order to ensure continued
eligibility to participate in the National Flood Insurance Program. Therefore,
the City of Coppell must enforce these regulations using, at a minimum, the
elevations and zone designations in the SFHAs as shown on your community's
FIRM, including the modifications made by this LOMR.
The map as listed above and as amended by this letter will be used for all
flood insurance policies and renewals issued for your community.
A Consultation Coordination Officer has been designated to assist you with any
problems you may have concerning this LOMR. This officer will be the primary
F~A contact for your community, and can be reached at the following address:
Mr. Alton S. Ray, Acting Chief
FEMA, Natural & Technological
Hazards Division
Federal Regional Center
800 North Loop 288
Denton, Texas 76201
(817) 898-9127
Any questions may be directed to your Consultation Coordination Officer.
Sincerely,
J~ks
Chief, Risk Studies Division
Federal Insurance Administration
Enclosures
cc: Ms. Shohre Daneshmand
Mr. Art Whitney, Roberts & Dowdey
Mr. Carl V. Anderson, P.E., Anderson Engineers, Inc.
CHANGES ARE MADE IN DETERMINATIONS OF THE CITY OF COPPELL, DENTON COUNTY,
TEXAS, BASE FLOOD ELEVATIONS UNDER THE NATIONAL FLOOD INSURANCE PROGRAM
On February 15, 1984, the Federal Emergency Management Agency identified
Special Flood Hazard Areas in the City of Coppell, Texas, through issuance of
a Flood Insurance Rate Map.
The Administrator, Federal Insurance Administration, has determined that
modification of the elevations of the flood having a one-percent chance of
occurrence in any given year (base flood) for certain locations in the City of
Coppell, is appropriate. The modified base flood elevations amend the Federal
Emergency Management Agency Flood Insurance Rate Map for the community.
The changes are made pursuant to Section 206 of the Flood Disaster Pro-
tection Act of 1973 (P.L. 93-234), and are in accordance with the National
Flood Insurance Act of 1968, as amended. (Title XIII of the Housing and Urban
Development Act of 1968, P.L. 90-448) 42 U.S.C. 4001-4128, and 44 CFR Part 65.
The modification to the effective Flood Insurance Rate Map for the City of
Coppell reflects completed channel and floodplain modifications along Denton
Creek. As a a result, the base flood elevations and the 100- and 500-year
floodplain delineations have been reduced. The revised base flood elevations
for Denton Creek are as follows:
Base Flood Elevation (NGVD)*
Location Effective Revised
Approximately 1.6 miles downstream 454 453
of Denton Tap Road
At Denton Tap Road 462 461
*National Geodetic Vertical Datum
2
Under the above-mentioned Acts of 1968 and 1973, the Administrator,
Federal Insurance Administration, must develop criteria for floodpiain man-
ag~ment. In order for the community to participate in the National Flood
Insurance Program, the community will be using the new base flood elevations
to administer the floodplain management measures of the National Flood Insurance
Program. These modified base flood elevations will also be used to calculate
the appropriate flood insurance premium rates for new buildings and their
contents and for the second layer of insurance on existing buildings and
contents.
Upon the second publication of notice of these changes in this paper, any
person has 90 days in which he can request through the Chief Executive Officer
of the community that the Administrator, Federal Insurance Administration,
reconsider the determination. Any request for reconsideration must be based
on knowledge of changed conditions or new scientific or technical data. All
interested parties are on notice that until the 90-day period elapses, the
Administrator's determination to modify the base flood elevations may itself
be changed.
Any person having knowledge or wishing to comment on these changes should
immediately notify:
The Honorable Lou Duggan
Mayor of the City of Coppell
P.O. Box 478
Coppell, Texas 75019