Parkview Addition-CS 871116Federal Emergency Management Agency
The Honorable Lou Duggan
Mayor of the City of Coppell
P.O. Box 478
Coppell, Texas 75019
Dear Mayor Duggan:
Washington, D.C. 20472
This is in reference to ~ September 18, 1987 letter from Mr. H. Wayne Ginn,
P.E., City Engineer for the City of Coppell. In his letter, Mr. Ginn requested
that the Federal Emergency Management Agency (FEMA) issue a Letter of Map
Revision (LOMR) to reflect the completed Parkview A~4ition ~roject along
Denton Creek. With his letter, Mr. Ginn submitted the following technical
information prepared by Roberts and Dowdey~ grading plans dated June 1987,
hydraulic analyses dated August 1987, water-surface profiles and channel cross
sections of Denton Creek, and floodplain maps.
The tract of land on which the Parkview Addition is located, had the 100-year
floodplain designation removed from it by a September 24, 1987 L~4R. This
LOMR revised the Flood Insurance Rate Map and Flood Boundary and Floodway Map
number 480170, panel 0005, dated February 15, 1984. Our October 29, 1987
phone conversation with Mr. Art Whitney confirmed that Roberts and Dowdey were
aware of this and were satisfied with the determination. Thus, for your
reference, we are enclosing a copy of the September 24, 1987 LOMR.
Should you have any questions regarding this matter, please do not hesitate to
contact the Chief, Natural and Technological Hazards Division of the Federal
Emergency Management Agency in Denton, Texas, at (817) 898-9127 or members of
our Headquarters staff in Washington, D.C., at (202) 646-2754.
Sincerely,
C~f, RiskStudies Division
Federal Insurance ~ministration
Enclosure
cc: Mr. H. Wayne Ginn, P.E.
Mr. Art Whitney, Roberts and Dowdey
Federal Emergency Management Agency
Washington, D.C. 20472
SEP 2 4 t981 :--.
CERTIFIED MAIL
RETURN RECEIPT REQUESTED
The Honorable Lou Duggan
Mayor of the City of Coppell
P.O. Box 478
Coppell, Texas 75019
Dear Mayor Duggan:
IA-RA-RS (102)
Community: City of CoPI~ll,
Denton County,
Texas
Map Panel ~,-her~ 480170 0005 C
Effective Date of
~his Revision= September 24, 1987
This is in reference ~o a letter dated December 10, 1986, and technical data
submitted by Ms. Shohre Danesh~ap~, City Civil Engineer for the City of
Coppell, regarding the Flood Insurance Study (FIS) for your community. In her
letter, Ms. Daneshmand requested that the Federal Energency Management Agency
(FEMA) issue a Letter of Map A~endment (LO, A) to incorporate completed channel
and floodplain modifications along Denton Creek. The area of concern for ~his
request extends fro~ Denton Tap Road to De Forest Road. All necessary materials
to process this request ware received as of June 29, 1987.
It should be noted that a LO~A is issued only to re~ove the Special Flood
Hazard Area (SFHA) designation, shown on ~he effective Flood Insurance Rate
Map (FIRM}, from an area occupied by a particular s~ructure if it is ~bove the
existing Base (100-year) Flood Elevation (BFE). Because this request is based
on a completed channel modifica~ion, which results in a reduction in the BFEs
and the 100- and 500-year floodplain delineations along a portion of Denton
Creek, a Letter of Map Revision (LC~R) to the FIS, FIRM, and Flood Boundary
and Floodway Map (FBFM) is being issued in lieu of a L~A. A LOMRis needed
to revise the BFEs and 100- and 500-year floodplain delineations along Denton
Creek based on changes in the hydraulic parameters used in the effective FIS,
FIRM, and FBFM for your community.
We have reviewed the submitted data that were ~repared by Threadgill-Dowdey &
Associates, which included the following= H~C-2 hydraulic ~odeling of pre-
and ~ost-channel modification conditions, da=ed June 29, 1987; and topographic
mapping, dated Septmher 12, 1986, representing the proposed changes to the
FIS, FIRM, and FBFM. Based on these data the BFEs and 100-year floodway
elevations, and the 100-year (Zone A3) and 500-year (Zone B) floodplains along
Denton Creek have been revised for a distance of approximately 1.6 ~iles ...
downstream of Denton Tap Road. This L(I~R amends FIRM and FBFM n-~her 480170,
panel 0005 and the FIS text, all of which are dated February 15, 1984. These
changes are shown on the enclosed flood profile sheets; annotated FIS text
Table 2, entitled 'Floodway Data'; annotated portion of FIRM panel 0005 C;
and annotated Portion of FBFM panel 0005. Please note that the locations
of the Denton Creek cross sections B and C have been revised, as shown on
~he enclosures. ." ~'~ ~-.~'
Anderson Engineers, Inc., is currently restudying several streams within the
City of Coppell, including Denton Creek; the analyses for the res~_~ied
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 ~reparing 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 cc~munity.
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 LC~R. 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, F~24A'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 interest~ persons may offer new
information or comments.
The determination made in this LC~R has been made pursuant ~o 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 LO~R.
The map as listed above and as amended by this letter will be used for all
flood insurance policies a~ renewals issued for your community.
3
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~4A contact for your community, and can be reached at the following address:
Mr. Alton S. Ray, Acting Chief
F~4A, Natural & Technological
Hazards Division
Federal Regional Center
800 North Loop 288
Denton, Texas 76201
(817) 898-91 27
Any questions' may be directed to your Consultation Coordination Officer.
Sincerely,
Chief, Risk Studies Division
Federal Insurance Administration
Enclosures
¢c: Ms. Shohre Daneshmand
Mr. Art Whitney, Roberts & DoPey
Mr. Carl V. Anderson, P.E., Anderson Engineers, Inc.