FS0001-CS020212NATIONAL FLOOD INSURANCE PROGRAM
FEMA MAP COORDINATION CONTRACTOR
Michael H. Boyd, P.E.
Executive Vice-President
Nathan D. Maier Consulting Engineers, Inc.
Two North Park
8080 Park Lane, Suite 600
Dallas, TX 75231
1N REPLY REFER TO:
Case No.: 02-06-827R
Community: City of Coppell,
Dallas County, Texas
Community No.: 480170
316-ACK.FRQ
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Dear Mr. Boyd:
This responds to your request dated January 31, 2002, 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:
Estates of Denton Creek
Flooding Source:
Elm Fork of the Trinity River and Denton Creek
FIRM Panel Affected:
Dallas County, Texas and Incorporated Areas
FIRM number 48113C0155 J, dated August 23, 2001
We have completed an inventory of the items that you submitted. The items identified below are
required before we can begin a detailed review of your request.
I. Our review indicates that the submitted annotated FIRM and topographic work map do not
reflect the current effective floodplain and floodway boundaries delineated on the current
effective FIRM panel. Please resubmit an annotated FIRM and topographic work map based
on the current effective floodplain and floodway boundaries delineated on the current
effective FIRM panel.
2. Please complete and submit MT-2 Form 4, titled "Riverine Hydraulic Analysis Form" for
Denton Creek.
3. Please submit proposed conditions hydraulic models for Denton Creek and for Elm Fork of
the Trinity River.
Please submit duplicate effective and proposed conditions floodway hydraulic models for
Denton Creek and the proposed conditions floodway hydraulic model for Elm Fork of the
Trinity River.
12101 Indian Creek Court, Beltsville, MD 20705 * Phone: 1~00-697-7275 · Fax: 301-210-5157
PBS&J, under contract with the FEDERAL EMERGENCY MANAGEMENT AGENCY,
is a Map Coordination Contractor for the National Flood Insurance Program
2
5.
Our review indicates that the discharges used in the submitted duplicate effective hydraulic
model for Denton Creek does not match the discharges listed in the current effective Flood
Insurance Study for Denton Creek. Please provide an explanation or provide the correct
model.
6. FEMA requires that when encroachments upon an adopted regulatory floodway will cause
1% annual chance flood elevation increases in excess of those permitted under the National
Flood Insurance Program regulations §60.3(d)(3), that the requirements of§65.12 be met. If
the proposed project causes increases in excess of those allowed, please provide evidence of
compliance with the following.
§65.12(a)(2) - Please provide an evaluation of alternatives to this project that would
not result in any increases to the 1% annual chance water surface elevations for
Denton Creek, demonstrating why these alternatives are not feasible. To better ensure
timely processing of your request, please have this evaluation directly address one or
more of the following issues:
i. The evaluation indicates that alternatives that do not cause increases are not
technically feasible.
ii. The chosen alternative demonstrates a net reduction of flood hazards. An
example of this could be a project involving a proposed dam or detention pond.
iii.
The chosen alternative provides other net public benefits. This benefit cannot
be a reduction in construction costs of a planned development or benefit to one
property owner or interest.
§65.12(a)(3) - Documentation of individual legal notice to all impacted property
owners within and outside of the community, explaining the impact of the proposed
action on their property.
c. §65.12(a)(5) - Certification that no structures are located in areas that would be
impacted by the increased 1% annual chance flood elevations.
Please send the required data to us at the address shown at the bottom of the first page. If all
required items are not submitted within 90 days of the date of this letter, FEMA will treat any
subsequent request as an original submittal, and it will be subject to all submittal/payment
procedures.
If you are unable to meet the 90-day deadline for submittal of required items and would like
FEMA to continue processing your request, you must request an extension of the deadline. This
request must be submitted to us 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.
FEMA receives 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.
When you write to us about your request, please include the case number referenced above in
your letter. If you have general questions about your case, FEMA policy, or the National Flood
Insurance Program, please call FEMA's toll free map assistance line at 1-877-FEMA MAP
(1-877-336-2627). If you have specific questions concerning your request, please contact the
Engineer assigned to your case, Mr. Daven Patel, by phone at 1-800-697-7275 Ext. 477, or by
e-mail at dpatel~pbsj.com.
Sincerely,
Joseph A. Martinenza J .
Acting Program Manager, Region VI
cc: The Honorable Candy Sheehan, Mayor, City of Coppell
Ken Griffin, P.E., Director of Engineering, City of Coppell