FS9901-CS000110Federal Emergency Management Agency
Washington, D.C. 20472
JAN 10 2000
Mr. Walter E. Skipwith, P.E.
Vice-President
HaIff Associates, Inc.
8616 Northwest Plaza Drive
Dallas, TX 75225
Dear Mr. Skipwith:
IN REPLY REFER TO:
Case No.: 00-06-276R
Community: City of Coppell, Texas
Community No.: 480170
316oAD
This is in reference to your September 28, 1999, request for a Conditional Letter of Map Revision for the
above-referenced community. In our earlier letter to you, we indicated additional data might be required
to complete our review of the request. The data required to complete our review, which must be submitted
within 90 days of the date of this letter, are listed on the enclosed summary.
If we do not receive the required data within 90 days, we will suspend our processing of your request.
Any data submitted after 90 days will be treated as an original submittal and will be subject to all
submittal/payment procedures, including the fiat review and processing fee for requests of this type
established by the revised fee schedule that became effective on March 1, 1999. A copy of the notice
summarizing the revised fee schedule, which was published in the Federal Register, is enclosed for your
infommtinn.
If you are unable to meet the 90-day deadline for submittal of required items, and would like the Federal
Emergency Management Agency to continue processing your request, you must request an extension of
the deadline. This request must be submitted to our Technical Evaluation Contractor in writing and must
provide (1) the reason why the data cannot be submitted within the requested timeframe, and (2) a new date
for the submittal of the data. We receive a very large volume of requests and cannot maintain inactive
requests for an indefinite period of time. Therefore, the fees will be forfeited for any request for which
neither the requested data nor a written extension request is received within 90 days.
If you have any questions regarding this matter, please contact Mr. Alan Johnson of our staff in
Washington, DC, either by telephone at (202) 646-3403 or by facsimile at (202) 646-4596.
Sincerely,
Matthew B. Miller, P.E., Chief
Hazards Study Branch
Mitigation Directorate
Enclosure(s)
CC:
Mr. Kenneth M. Griffin, P.E.
Director of Public Works
City of Coppell
Mr. Russell P. Erskine
Hydrologist
Halff Associates, Inc.
Summary of Additional Data Required to Support a
Conditional Letter of Map Revision
Case No.: 00-06-276R
Requester: Mr. Walter E. Skipwith, P.E.
Community: City of Coppell, Texas
Community No.: 480170
The issues listed below must be addressed before we can continue the review of your request.
In the submitted hydraulic model for Denton Creek, the revised elevations of the flood having a
1-percent chance of being equaled or exceeded in any given year (base flood) and floodway tie
within 0.5 foot into the effective elevations of the base flood and floodway at Cross Section 28870.
Please extend the floodplain and floodway boundary delineations shown on the topographic work
map enti~ed "Revised (Proposed) Conditions Site Plan," prepared by your firm, dated
September 1999, to include cross sections between 23370 and 28870 so that the revised floodplain
and floodway boundary delineations tie into the effective floodplain and floodway boundary
delineations at the upstream end of the revised reach along Denton Creek.
Our review of the submitted proposed floodway model revealed that the model ends at Cross
Section 22370. Please extend the proposed floodway model to include effective Cross
Sections 23800 through 28870 so that the base flood elevations (BFEs) tie into the effective BFEs
within 0.5 foot. In addition, please ensure that the floodway analysis produces maximum
surcharges of no more than 1.0 foot throughout the revised reach.
Our review revealed that the Cities of Carrolhon and Lewisville will be affected by this revision.
Please provide community acknowledgment in the form of letter(s) from the Cities of Carrollton
and Lewisville stating that each community has reviewed the revision request and understands the
effects of the revision on flooding conditions in the community, or Application/Certification
Form 1, entitled "Revision Requester and Community Official Form," signed by a community
official from the City of Carrollton and a community official from the City of Lewisville.
Please send the required data directly to our Technical Evaluation Contractor at the following address:
Michael Baker Jr., Inc.
3601 Eisenhower Avenue, Suite 600
Alexandria, Virginia 22304
Attention: Ms. Laura Bittner
(703) 317-6292
For identification purposes, you must include the case number referenced above on all correspondence.
Federal Emergency Management Agency
Washington, D.C. 20472
November 30, 1999
Mr. Walter E. Skipwith, P.E.
Vice-President
Halff Associates, Inc.
8616 Northwest Plaza Drive
Dallas, TX 75225
IN REPLY REFER TO:
Case No.: 00-06-276R
Community: City of Coppell, Texas
Community No.: 480170
3 16-ACK. FRQ
Dear Mr. Skipwith:
This responds to your request dated September 28, 1999, that the Federal Emergency Management Agency
(FEMA) issue a conditional revision to the Flood Insurance Rate Map (FIRM) for the above-referenced
community. Pertinent information about the request is listed below.
Identifier: Windsor Estates and DeForest Court )
Flooding Source: Denton Creek
FIRM Panel(s) Affected:
0010 E
We have completed an inventory of the items that you submitted. We have received the data and the
review and processing fee ($3,100) required to begin a detailed technical review of your request. If
additional data are required, we will inform you within 30 days of the date of this letter.
Please direct all questions concerning your request to our Technical Evaluation Contractor at the following
address:
Michael Baker Jr., Inc.
3601 Eisenhower Avenue, Suite 600
Alexandria, Virginia 22304
Attention: Ms. Laura D. Bitmer
(703) 317-6292
When you write us about your request, you must include the case number referenced above in your letter.
2
If you have any questions concerning FEMA policy, or the National Flood Insurance Program in general,
please contact Mr. Alan Johnson of our staff in Washington, DC, either by telephone at (202) 646-3403
or by facsimile at (202) 6464596.
Sincerely,
Matthew B. Miller, P.E., Chief
Hazards Study Branch
Mitigation Directorate
CC:
Mr. Kenneth M. Griffin, P.E.
Director of Public Works
City of Coppell