DR9305-CS 940607 Federal
· ~
CIIRTIFIHD MAIL
IIE~N RI~CEIPT REQUESTED
i ,o
Emergency Managem e i Ag t cy ,99a
'" '--' -vvasmngton, D.C. 20472 ~: :,~:.~ ~ ~
.JUN 0 7
IN REPLY REFER TO:
Case l~o.: 93-06-267R
The Honorable Tom Norton Community~ City of Coppell,
Nayor, City of Coppell Texas
P.O. Box 678 Community No.: 480170 ~/I 5 ~_-~
Coppell, Texas 75019 . /~,lt~
This is in r~sponse to a letter da~ed J~ 21, 1994, ~rom Nr. ~[en ~ud
D,n,,
ur~n, P.E., .C~ty ~8~neer, City of Coppell, ~o ~he Federal ~r8~c~
~na8~nt ~ency (F~) re8ardin8 the effective Flood Insur~ce Study
report and Flood Insur~ce ~te ~p (FI~) for ~he City of Cop~ll, Texas,
dated April 1~, 1994. ~i~h their letter, Hr. Bede and Nr. Criffin provided
additional [n[o~ion to sup~r~ a J~e 2~, 1993, request for a Conditional
Letter of ~p Revision (C~) from Hr. Criffin. Hr. Griffin requested that
F~ eval~te ~he effects that a pro~sed ch~el ~inins and ~he const~c~[on
of two footbrid8es alon8 Crapevine Creek Would have on the effective
report and FI~. ~e proposed ch~e~ [inins would affect a b~ass channel
of Crapev[ne Creek located approxi~ely ~00 feet do~s~re~ of ~he S~. Louis
Southweste~ ~ilway (SLSR) to approximtely 880 feet do~stre~ of the SLSR.
~e two proposed footbrid8es would ~ located alons the min ch~el
Crapevine Creek at approxi~te[y 72~ feet and 900 feet do~s~re~ of the
SLSR, respectively.
All data required by FBNA to evaluate this request were submitted by
Nr. Criffin with his letters dated June 25 and July 16, 1993, and w~th the
joint letter from Nr. Beene and Nfo Criffin. All fees necessary to process
this CLOHR, a total of $1,820, have been received.
We have rev[e=ed the data submitted and the flood data uved to prepare the
effective Fief for the City of Coppell, Texas. The submitted existing
conditions HHC'2 hydraulic computer models, dated Hay 13, Hay 17, and Hay 31,
1993, based on updated topographic [n£ormat[on, were used as the base
conditions models in our review of the proposed cond[tions model for this
CLOHR request. This model resulted in ~ncreased 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
th~s reach have also changed. The increases due to updated toposraphlc
information are on and off the requester~s property. We believe that if the
proposed project is constructed as shown on the report entitled **Crapevlne
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 1992; and the plans entitled "Crapevine Springs,"
prepared by the Depar~nent of Public Works, Dallas County, dated Hatch 1993,
the 100- and 500-year floodplain and 100-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 BFBs 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 FIg report and FIRN.
e
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 letter is submitted, Form 1, entitled
"Revision Requester and Con,unity Official Form," and Form 2,
entitled "Certification by Registered Professional ~ngineer and/or
Land Surveyor," must be included. (Copies o£ these forms are
enclosed.)
Please note that the National Flood Insurance ProEram (I~FIP) 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, F~NA 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 National Flood
~nsurance Prolram, or by credit card payment. The payment is to'be
£orwarded to the following addressl
Federal F~nergency Nanagement A~ency
Revisions Fee-Collection System Admlnistrator
P.O. Box 3173
Nerri£1eld, Virginia 22116
As-built plans, certified by a registered professional engineer, of
all proposed project elements
Copy of the public notice distributed by the co~unity stating the
co~nunity's intent to revise the floodway, or a statement by the
c0e~nunity that it has noti£ied all a££ected 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, F~NA will initiate a revision to the FIg report and FIRN. Because
the BFEs would change as a result of this project, a 90-day appeal period
would be initiated, during ~hich comamnity 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 con~nunity would
adopt and enforce the modified £1oodway. If the State of Texas has
jurisdiction over either the floodway or its adoption by your con~nunity, 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)(?) of the I~FIP regulations requires
that co~mnities "assure that the flood-carrying capacity within the altered
or relocated portion o£ any watercourse is maintained." This provision is
incorporated into your coa~r~nity's existing floodplain management
regulations. Consequently, your community ~ust agree to accept
responsibility for the maintenance of the modified channel before allowing
its construction.
This response to Mr. Criffln's request is based on minimum floodplain
management criteria established under the NFIP. Your com~unlty 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 con, unity o££icials, 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 minimumNFIP requirements.
Should 'yo~ have any questions regarding this matter, please contact the
Division Director, Nitlgation Division of F~NA in Denton, Texas, at
(817) 898-5127, or Mr. John Nagnotti of our staff in Washington, DC, either
by telephone at (202) 646-3932 or by facsimile at (202) 646-3445.
cc~ ~Mr. Kenneth M. Criffin, P.E.
City Engineer
City of Coppell
Michael K. Buckley, P.E., Chief
Hazard Identification Branch
Mitigation Directorate
Mr. Allen Bud Beene, P.E.
Director of Public Works
Dallas County
Mr. Meal Chisholm, P.E.
CAI