FS8901-CS 910801Federal Emergency Management Agency
Washington, D.C. 20472
~6 1!991
Community: City of Coppel
Dallas County
Texas
Community No.: 480170
Mr. Erv A. Meyer
Nathan D. Maier Consulting
Engineers, Inc.
Three North Park
8800 North Central Expressway,
Suite 300
Dallas, Texas 75231
Dear Mr. Meyer:
This letter serves as a follow-up to your July 3, 1991 telephone conversation
with Matt Miller of my staff and subsequent July 22, 1991 letter regarding the
July 3, 1990 revision request for the Flood Insurance Study (FIS) and Flood
Insurance Rate Map (FIRM) for the City of Coppell. This request, with data
prepared by Nathan D. Maier Consulting Engineers, Inc. (NDM), involved
revising the Federal Emergency Management Agency (FEMA)-designated floodway
for the Elm Fork of the Trinity River north of the St. Louis and Southwestern
Railroad and Beltline Road in an area known as the HRWS Tract. Along with the
submittal, an untitled floodplain workmap was submitted depicting the revised
floodway configuration.
The basis of this requested floodway revision was to modify GR points at cross
section 89050 of the Elm Fork of the Trinity River HEC-2 models to more
accurately reflect the upstream ineffective flow area, due to the embankment
of the St. Louis and Southwestern Railroad. As stated in our November 30,
1990 letter to the City of Coppell, our review of the revised floodway
indicated that the revised GR points at cross section 89050 better represent
existing flow conditions. It is still our intention to incorporate the
revised floodway configuration into a revised FIS and FIRM for the City of
Coppell.
It is most efficient and cost-effective for FEM~ to incorporate the maxim~
number of revision requests when preparing and publishing a revised FIS and
FIRM for a given community. Since January 1989, we have been processing a
separate revision to the City of Coppell FIS and FIRM to reflect a restudy of
all streams prepared by Kimley-Horn and Associates, Inc. (KHA); therefore, it
has been necessary for us to coordinate the HRWS Tract floodway revision
request with the KHA restudy. However, due to numerous delays in receiving
all the necessary data to support the KHA restudy, we have not yet been able
to issue a preliminary revised FIS and FIRM for the City of Coppell. However,
we have recently received additional data which should allow us to complete
our review and issue the preliminary revised FIS and FIRM. We anticipate
issuing the preliminary revised FIS and FIRM for the City of Coppell to
reflect the KHA restudy and HRWS Tract floodway revision by the end of
September 1991.
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) 898-5127 or Matthew B.
Miller of our Headquarters staff in Washington, D.C., at (202) 646-3461.
Sincerely,
William R. Locke
Chief, Risk Studies Division
Federal Insurance Administration
The Honorable Mark Wolfe, Mayor of the City of Coppell
Ms. M. Shohre Daneshmand, P.E., Acting Coppell City Engineer
Mr. Ronald W. Morrison, P.E., Senior Hydrologist Morrison
Hydrology/Engineering, Inc. '