Summit P1-CS 940607CERTIFIED MAIL
RETURN RECEIPT REQUESTI~D
Federal Emer§ency Mana§ement A§ cy J
Washington, D.C. 20472
1984
IN REPLY REFER TO:
Case No.: 93-06-267R
The Honorable Tom Norton Co~z~nityl City of Coppell,
Mayor, City of Coppell Texas
P.O. Box 478 Cosmmit7 No.: 480170~kk[_~t~_~zr-o~
Coppell, Texas 75019 ·
This is in response to a letter dated J~ 21, 1994, from Mr. Alien ~ud
Beene, P.E., Director of ~bllc ~orks, Dallas Co~ty, ~d
Gri[fin, P.~., .City ~ineer, City of Coppe11, to the Feder~ ~rsenc~
Management Asency (F~4A) regarding the effective Flood Insurance Study (PIS)
report and Flood Insurance Rate Nap (FIRM) for the City of Coppell, Texas,
dated April 15, 1994. With their letter, Mr. Beene and Mr. Crlffin provided
additional information to support a June 25, 1993, request for a Conditional
Letter of Map Revision (CLOMR) from Mr. Criffin. Mr. Criffin requested that
FEHA evaluate the effects that a proposed channel lining and the construction
of two footbridges along Crapevine Creek Would have on the effective PIS
report and FIRM. The proposed channel lining would affect a bypass channel
of Crapevine Creek located approximately 500 feet downstream of the St. Louis
Southwestern Railway (SLSR) to approximately 880 feet downstream of the SLSR.
The two proposed footbridges would be located along the main channel of
Grapevine Creek at approximately 725 feet and 900 feet downstream of the
SLSR, respectively.
All data required by FI~IA to evaluate this request were submitted by
Mr. Criffin with his letters dated June 25 and July 16, 1993, and with the
joint letter from Mr. Beene and Mr. Crlffln. All fees necessary to process
this CLONR, a total of $1,820, have been received.
We have reviewed the data submitted and the flood data used to prepare the
effective FIRM for the City of Coppell, Texas. The submitted existing
conditions HEC-2 hydraulic computer models, dated Nay 13, May 17, and Nay 31,
1993, based on updated topographic information, were used as the base
conditions models in our review of the proposed conditions model for this
CLOHR request. This model resulted in increased base (100-year) flood
elevations (BFEs) of a maximum of 1.6 feet downstream of the SLSR. The
Special Flood Hazard Area (SFHA) increased from just upstream of Bethel Road
to just upstream of Southwestern Boulevard. The floodway boundaries along
this reach have also changed. The increases due to updated topographic
information are on and off the requester~s property. We believe that if the
proposed project is constructed as shown on the report entitled 'Crapevine
Springs Park Hydraulic Study," prepared by Craham Associates, Inc. (CAI),
dated June 3, 1993; the plans entitled 'Crapevine Springs Park," prepared by
CAI, dated September 19921 and the plans entitled 'Crapevlne Springs,"
prepared by the Department of Public Works, Dallas County, dated March 1993,
the 100- and 500-year floodplain and lO0-year floodway boundaries will be
delineated as shown on the topographic work maps entitled "Hydraulic Existing
Conditions," dated June 1993, and "Hydraulic Study," dated September 23,
1993, both prepared by CAI. As a result of the proposed project, minor
increases and decreases of the BFEs and the SFHA will occur as compared to
the base conditions model (existing conditions). The increases in the SFHA
will be located on the Crapevine Springs Park property, which was squired by
the Dallas County Park Department and is located in the City of Coppell.
Upon completion of the project and receipt of the data listed below, we will
make a final determination on revising the effective PIS report and FIRN.
Detailed application and certification forms, which were used in
processing this request, must be used for requesting final
revisions to the maps. Therefore, when the map revision request
for the area covered by this fetter is subm£tted, Form 1, entitled
"Revision Requester and Community Official Form," and Form 2,
entitled "Certification by Re$istered Professional Engineer and/or
Land Surveyor," must be included. (Copies of these forms are
enclosed.)
Please note that the National Flood Insurance Program (h-rIP) is
non-taxpayer funded and its expenses are paid for by policyholders.
Therefore, to minimize the financial burden on the policyholders
while maintaining the I~FIP as self-sustaining, FENA has implemented
a procedure to recover costs associated with reviewing and
processing requests for modifications to published flood
information and maps. Therefore, an initial fee of $225, which
represents the minimum charges associated with a request of this
type, must be submitted before we can process your revision
request. Payment of this fee shall be made in the form of a check
or money order made payable in U.S. funds to the Natlonal Flood
~nsurance Pro,rem, or by credit card payment. The payment is to'be
forwarded to the following addressl
Federal ~mergency Nanagement Asency
Revisions Fee-Collection System Administrator
P.O. Box 3173
Nerrlfleld, Virginia 22116
e
As-built plans, certified by a registered pro£esslonal engineer, o£
all proposed project elements
e
Copy o£ the public notice distributed by the community stating the
community's intent to revise the floodway, or a statement by the
community that it has notified all affected property owners and
affected adjacent jurisdictions
Hydraulic analyses, for as=built conditions, of the 10- and 50-year
floods
A~ter receiving appropriate documentation to show that the project has been
completed, FF2~A will initiate a revision to the PIS report and PIRIe. Because
the BFEs would change as a result of this project, a 90-day appeal period
would be initiated, during which co.hungry officials and interested persons
may appeal the revised BFEs based on scientific or technical data.
Because the existing floodway will need to be modified as part of the
revision, we would require a letter from you stating that the community would
adopt and enforce the modified floodway. If the State of Texas has
jurisdiction over either the floodway or its adoption by your community, we
would need a copy of your letter to the appropriate State agency notifying it
of the floodway modification and a copy of a letter from that agency stating
its approval of the modification.
The basis of this CLONR is, in part, a proposed channel-modification/bridge
construction project. Paragraph 60.3(b)(7) of the NFIP regulations requires
that communities "assure that the flood-carrying capacity within the altered
or relocated portion of any watercourse is maintained." This provision is
incorporated into yoar community's existing floodplaln management
regulations. Consequently, your community must agree to accept
responsibility for the maintenance of the modified channel before allowing
its construction.
This response to Mr. Grlffln's request is based on mini~u~ floodplain
management criteria established under the NFIP. Your comity is
responsible for approving all proposed floodplain development, including this
request, and for assuring that the necessary permits required by Federal or
State law have been received. State and community officials, based on
knowledge of local conditions and in the interest of human safety, may set
higher standards for construction or may limit development in floodplain
areas. If the State of Texas or the City of Coppell has adopted more
restrictive or comprehensive floodplain management criteria, those criteria
take precedence over the minimum NFIP requirements.
Should yo~ have any questions regarding this matter, please contact the
Division Director, Nitigation Division o£ FEMA in Denton, Texas, at
(817) 898-5127, or Hr. John Nagnottl of our staff in Washington, DC, either
by telephone at (202) 646-3932 or by facsimile at (202) 646-3445.
cc: ~ Hr. Kenneth M. Griffin, P.E.
City Engineer
City of Coppell
Sincerel~y,
Nichael K. Buckley, P.E., Chief
Hazard Identification Branch
Nitigation Directorate
Mr. Allen Bud Beene, P.E.
Director of Public Works
Dallas County
Mr. Neal Chisholm, P.E.
GA1