Alexander Ct-CS080107
NATIONAL FLOOD INSURANCE PROGRAM
FEMA NATIONAL SERVICE PROVIDER
JanuaI)' 7, 2008
Mr. Michael H. Boyd, P.E.
Executive Vice President
Nathan D. Maier Consulting Engineers, Inc.
8080 Park Lane, Suite 600
Dallas, TX 75231
IN REPLY REFER TO:
Case No.: 07-06-2203P
Community: City of Coppell, TX
Community No.: 480170
316-AD
Dear Mr. Boyd:
This is in regard to your submittal dated November 14, 2007, concerning a July 26, 2007, request that the
Department of Homeland Security's Federal Emergency Management Agency (FEMA) issue a revision to
the Flood Insurance Rate Map (FIRM) for the Dallas County, Texas and Incorporated Areas. Pertinent
information about the request is listed below.
Identifier:
Grapevine Creek
Flooding Source:
Grapevine Creek
FIRM Panel( s) Affected:
48113C0155 J
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 flat review and processing fee for requests of this type
established by the current fee schedule. A copy of the notice summarizing the current fee schedule, which
was published in the Federal Register, is enclosed for your information~
FEMA receives a very large volume of requests and cannot maintain inactive requests for an indefinite
period of time. Therefore, we are unable to grant extensions for the submission of required data for revision
requests. If a requester is informed by letter that additional data are required to complete our review of a
request, the data/fee must be submitted within 90 days of the date of the letter~ Any fees already paid will
be forfeited for any request for which the requested data are not received within 90 days~
If you have general questions about your request, FEMA policy, or the National Flood Insurance Program,
please call the FEMA Map Assistance Center, toll free, at 1-877-FEMA MAP (1-877-336-2627).
If you have specific questions concerning your request, please contact your case reviewer,
Mr. Kathirvel Arumugam, bye-mail at kathirveLarumugam@mapmodteam.com or by telephone at
3601 Eisenhower Avenue.. Alexandria.. VA 22304-6425 PH:1-877-FEMA MAP FX: 703~960.9125
The Mapping on Demand Team, under contract with the Federal Emergency Management Agency, is the
National Service Provider for the National Flood Insurance Program
2
(703) 960-8800, extension 3026. You may also contact the Revisions Coordinator for your State,
M. Saleem Ashraf, Ph.D., P.E., bye-mail at saleem.ashraf@mapmodteam.com or by telephone at
(703) 317-6225.
Sincerely,
~~v~
Syed Qayum, CFM
National LOMR Technical Manager
Michael Baker Jr., Inc.
Enclosures
cc: Mr. Ken Griffin, P.E.
Director of Engineering
Department of Public Works
City of Coppell
NATIONAL FLOOD INSURANCE PROGRAM
FEMA NATIONAL SERVICE PROVIDER
Summary of Additional Data Required to Support a
Letter of Map Revision
Case No.: 07-06-2203P
Requester: Mr. Michael H. Boyd, P~E~
Community: City of Coppell, TX
Community No.: 480170
The issues listed below must be addressed before we can continue the review of your request
1. Please submit a copy of the individual legal notice sent to all property owners affected by any
widening and/or shifting of the Special Flood Hazard Area, the area that would be inundated by the
base (I-percent annual-chance) flood, and/or any increases in the Base Flood Elevation (BFE). The
notice must include a descriptive explanation of these changes~ Please follow the template for this
letter on page 17 of the instructions for the MT -2 Application/Certification forms, which may be
accessed at bttp://www. fema. gov /pdf/ fhmImt -2. pdf.
2. Paragraph 65.6(a)(2) of the National Flood Insurance Program regulations states that to avoid
discontinuities between revised and unrevised flood data, hydraulic analyses must have a logical
transition between revised BFEs and those developed previously for areas not affected by the revision.
Our review revealed that the submitted post-project conditions hydraulic model for Grapevine Creek
does not tie into the effective hydraulic analysis within O~5 foot at the upstream end of the revised
reach. Please provide a revised hydraulic model for Grapevine Creek that ties into the effective
hydraulic analysis within 0.5 foot, or within 0.0 feet ifpractical.
3~ Please address the following comments regarding the submitted post-project conditions HEC-RAS
hydraulic models, or provide an explanation for each.
a. Our review revealed that the contraction and expansion loss coefficients at Cross Sections 25550
and 27620, which were 0.1 and 0.3, respectively, do not reflect modeling practices generally
accepted in HEC-RAS. Contraction and expansion loss coefficients of 0.3 and 0.5, respectively,
may be more appropriate.
b~ Please revise the post-project conditions hydraulic model so that the left and right encroachment
stations at Cross Sections 23900, 27400, and 27900 are located at the left or right channel bank
stations or in the floodway fringe, the area between the channel bank station and the limits of the
base floodplain.
4. The submitted work map entitled, "'Sheet 1, Floodplain Work Map," dated November 2007, prepared
by your firm, does not include the flow line, floodway and floodplain delineations between
Cross Sections 27900 and 30130. Please submit a revised topographic work map, certified by a
registered professional engineer, using an appropriate scale, that reflects any changes resulting from
Items 2 and 3 above, and contains all applicable items listed in Section C of Application/Certification
Form 2, entitled '~Riverine Hydrology & Hydraulics Form," including the following:
a. The effective boundary delineations of the regulatory floodway, base floodplain, and
O.2-percent-annuaI-chance floodplain and how they tie into the post-project conditions boundary
delineations at the upstream and downstream limits of the revision area;
3601 Eisenhower Avenue, Alexandria, VA 223~25 PH:1-877-FEMA MAP FX: 703.960..9125
The Mapping on Demand Team, under contract with the Federal Emergency Management Agency, is the
National Service Provider for the National Flood Insurance Program
2
b. The topographic information, with labeled contour lines, used for the floodway and floodplain
boundary delineations;
c. The locations and alignments of the cross sections used in the hydraulic analysis;
d. A north arrow, the scale, and the vertical datum; and
e. The flow line used in the hydraulic model.
If digital data are submitted, please include any supporting documentation or metadata with the data
submittal, including relevant projection information. Current mapping standards use the Unive~l
Transverse Mercator (UTM) projection and State Plane Coordinate System, in accordance with
Federal Emergency Management Agency mapping specifications. Data not submitted in ESRI
mapping format can be submitted in any supported data format, which includes AutoCAD,
Microstation, and MapInfo.
5. Please submit a copy of a certified, annotated Flood Insurance Rate Map (FIRM), at the scale of the
effective FIRM, which reflects any revisions made to the floodway and floodplain boundary
delineations as a result of Items 2 through 4.
Please send the required data directly to us at the address shown at the bottom of the fIrSt page. For
identification purposes, please include the case number referenced above on all correspondence.
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FEE SCHEDULE FOR PROCESSING REQUESTS FOR MAP CHANGES
This notice contains the fee schedule for processing certain types of requests for changes to National Flood
Insurance Program (NFIP) maps. The fee schedule allows FEMA to further reduce the expenses to the NFIP by
more fully recovering the costs associated with processing conditional and final map change ~uests. The fee
schedule for map changes is effective for all requests dated October I. 2007. or later and supersedes the fee
schedule that was established on October 30, 2005.
To develop the fee schedule for conditional and final map change requests~ FEMA evaluated the actual costs of
reviewing and processing requests for Conditional Letters of Map Amendment (CWMAs), Conditional Letters of Map
Revision = Based on Fill (CLOMR-Fs). CoDditionaJ Letters of Map Revision (CWMRs), Letters of Map Revision "'"
Based on Fill (LOMR-Fs), and Letters of Map Revision (WMRs)..
Based on OUT review of actual oost data for Fiscal Years 2005 and 2006. FEMA has maintained the following
review and processing fees. which are to be sUbmitted with all requests that are not otherwise exempted under
44 eFR 72.5..
. Fee Scbedule for Requests for CLOMAs, CWMR-Fs, and LOMR-Fs
RC<f1est for single-lotIsingle~structure C LO MA and CLO MR -F m_..... ...._ ____ __. __. ___. _. __ __ ____ __ __... _ __ _. __ __ . . . _. __ .. $500
Retluest for single-loti single structure LO MR -F.. -- . -- --... .. --. '''''''''''--'' __ __..... ___..... ..__. __..... "oo... __... ....oo. .. . . .. __ $425
Request for single-Iot/single-structure LOMR-F based on as-built
infonnation (CLOMR-F previously issued by FEMA) oo.........-..--.._.oo_______.__oo_.____....__.......____._.oo..oo.__oo $325
Request for multiple-lotImultiple-structure C LO MA . -- --. ..oo...oo... ..... _ __. "'" .__....... ....m ....... ___.... . ____ ... ...... ___ $ 700
Request for multiple-lotImultiple-structure C LOMR -F and LOMR -F .--...... .___. ............... '''''' __....__.. .. . .. . __. $ 800
Request for multiple-lotImultiple-structure LOMR-F based on as-built
information (CLOMR-F previously issued by FEMA) 4....~UH...._......uu....u-u...u.....UU.UhHUHU....H....HU....U. $700
Based on oue review of actual cost data for Fiscal Years 2005 and 2006. FEMA has established the following
review and processing fees. which are to be submitted with all requests that are not otherwise exempted.
Fee Schedule for Requests for CLOMRs
Request based on new hydrology, bridge~ culvert, channel, or combination
of any of these.................. ......................... ........... ............. """"'_"'" .......__.... .......... ....... """"" .......... $4.400
Request based on levee. berm, or other structural measure . ...........__..................... ............ .............. . .. .... $5.500
Fee Schedule for Requests (or Map Revisions
Requesters must submit the review and processing fees shown below with requests for LOMRs that are not based
on structural measures or alluvial fans..
Request based on bridge. cui vert, channel. or combination of these ... ........ ...... ~_ ............... ........ . ........... $4,800
Request based on levee, berm, or other structural measure ........-......._.........___..............._....................... $6,500
Request based on as-built information submitted as follow-up to CWMR................._......................... $4.800