Billingsley-CS050525Federal Emergency Management
Washington, D.C. 20472
MAY 2 5 2005
CERTIFIED MAll,
P, ETURN RECEIPT REQUESTED
IN REPLY REFER TO:
Case No.: 04-06-A148R
CITY MANAGER
CITY OF COPPE~,I~, ,
Thc Honorable Doug Stovcr
Mayor, City of Coppell
255 Parkway Boulevard
Coppell, TX 75019
Cormnunity: City of Coppell, TX
Community No.: 480170
104
Dear Mayor Stover:
This responds to a request that the Department of Homeland Security's Federal Emergency Management
Agency (FEMA) comment on the effects that a proposed project would have on the effective Flood
Insurance Rate Map (FIRM) and Flood Insurance Study (FIS) report/'or Dallas County, Texas and
Incorporated Areas (the effective FIRM and FIS report lbr your community), in accordance with Part 65 of
the National Flood Insurance Program (NFIP) regulations, lu a letter dated August 6. 2004, Mr. Walter E.
Skipwith, P.E., Vice President, Halff Associates, Inc., requested that FEMA evaluate the effects that the
proposed Billingsley Tract project along Grapevine Creek from approximately 2,100 feet upstreana of
Beltline Road to approximately 300 feet upstream of MacArthur Boulevard would have on the flood
hazard inlbnnation shown on tim effective FIRM and F1S report. The proposed project will include
updated topographic information, placement of fill in the left overbank of Grapevine Creek, and creation of
a swale along the filled bank to coxnpensate lbr thc conveyance loss caused by the landfill.
All data requircd to complete our review of this request lbr a Conditional Letter of Map Revision
(CLOMR) were submitted with letters from Mr. Russell P. Erskinc, ttydrologist, also with Halfl'
Associates, Inc., and Mr. Skipwith.
Because this revision request also affects thc Cities of Dallas and Irving, separate CLOMRs fbr those
communities were issued on the same date as this CLOMR.
We reviewed the submitted data and the data used to prepare thc effective FIRM tbr your community and
determined that the proposed project meets the mininmm floodplain management criteria of the NFIP. Tile
submitted existing conditions tfEC-RAS hydraulic computer model, dated June 2004, based on updated
topographic inlbrmation, was used as the base conditions model in our review of the proposed conditions
inodel lbr this CLOMR request. We believe that. if the proposed project is constructed as shown on the
work map entitled "Floodplain and Floodway Delineations," prepared by HalffAssociates, Inc., dated
April 14, 2005, and the data listed below are received, a revision to the FIRM would be warranted.
()ur comparison of existing conditions to the effective data revealed lhat as a result of the updated
topographic inlbrulation, the elevations of the flood having a l-percent chance of being equaled or
exceeded in any given year (base flood) increased and decreased along Grapevine Creek lbr the project
area and your community. 'File maximum increase in Base Flood Elevation (BFE), 1.8 feet, occurred
approximately 1,600 feet upstream of MacArthur Boulevard lbr the project area and your community. The
maximum decrease in BFE, 2.4 feet, occurred approximately 150 feet upstream of Beltline Road for the
project area and your community.
As a result of the proposed project, the BFEs lbr Grapevine Creek will increase and decrease compared to
the existing conditions BFEs lbr thc project area and your community. Thc maximum increase in BFE,
0.1 lbot, will occur approximately 120 feet upstream of Beltline Road for the project area and your
community. Thc maximum decrease in BFE, 1.0 lbot, will occur approximately 1,700 feet downstream of
l',eltlme Road for the project area and your commmfity.
As a result of the proposed project, the BFEs lbr Grapevine Creek will increase and decrease conrpamd to
the effective BFEs. The maximum increase ill BFE, 1.7 l~eet, will occur approximately 1,600 feet upstream
of MacArthur Boulevard for the project area and your community. The maxinmm decrease in BFE,
2.5 feet, will occur approximately 150 fcet upstream of Beltline Road for the project area and your
community.
As a result of the proposed project, the width of the Special Flood Hazard Area (SFHA), the ama that
would be inundated by the base flood, along Grapevine Creek will increase in some areas and decrease in
nther areas compared to the effective SFHA width. The lnaximum increase in SHFA width for the project
ama, approximately 120 feet, will occur approximately 2,000 feet downstream of Beltline Road. The
maximum decrease in SHFA width lbr thc project area, approximately 830 feet. will occur approximately
2,600 feet downstream of Beltline Road. The ~naximum decrease in SHFA width lbr your community,
approximately 700 feet, will occur approximately 1,100 feet upstream of MacArthur Boulevard.
As a result of the proposed project, the width of the regulatory floodway will increase in some areas and
decrease in other areas compared to the effective floodway width. Tile maximum increase in floodway
width for the project area, approximately 1 I 0 feet, will occur approximately 1,400 feet downstream of
Beltline Road. The maximum increase in floodway width for yx)ur community, approximately 60 l;eet, will
occur approximately 1,400 feet downstream of Beltline Road. The maximum decrease in floodway width
lbr the project area, approxiinately 360 teet, will occur just downstream of Beltline Road. The maximum
decrease in floodway width for your community, approximately 300 feet, will occur just upstream of
Beltline Road.
Upon completion of thc project, your community may submit the data listed below and request that we
make a final deterlnmation on revising the effective FIRM and FIS report.
Detailed application and certification lbm~s, which were uscd in processing this request, must be
used lbr requesting final revisions to thc nraps. Therefore, when the map revision request tbr tile
area covered by this letter is submitted, Form 1, entitled "Overview & Concurrence Fonn," must
be included. (A copy of this lbml is enclosed.)
The detailed application aud ccrlification lbrms listed below may be requircd if as-built conditions
differ l?om the conceptual plans. If required, pleasc submit ne~v tbm~s (copies of ~vhich are
enclosed) or annotated copies of the previously submitted forms showing the revised information.
Form 2, entitled "Riverme 1 lydrology & tlydraulics Foml"
l:om~ 3. entitled "Riverine Structures Form"
Hydraulic analyses, lbr as-built conditions, of the base flood; the floods having a 10-, 2-, and
0.2-percent chance of being equaled or exceeded in any given year; and the regulatory floodway,
together with a topographic work map showing the revised floodplain and floodway boundaries,
must be sub~nitted with Form 2.
Eflkctive September 1, 2002, FEMA revised the lee schedule Ibr reviewing and processing
requests lbr conditional and final modifications to published flood inlbnnation and maps. In
accordance with this schedule, the current fcc for this map revision request is $3,800 and must be
received betbre we can begin processing the request. Please note, however, that the tee schedule is
subject to change, and requesters are required to submit the tee in effect at the time of the
submittal. Payment of this lke shall be made iu the form of a check or money order, made payable
in U.S. funds to the National Flood Insurance Program, or by credit card. The payment must be
forwarded to the following address:
Federal Emergency Management Agency
Fee-Charge Syste~n Administrator
P.O. Box 22787
Alexandria, VA 22304
· As-built plans, certified by a registered professional engineer, of all proposed project elements
· Community acknuwledgtnent of the map revision request
A copy of the public notice distributed by your community stating its intent to revise the regulatory
floodway, or a statement by your community that it has notified all affected property owners and
affected adjacent jurisdictions
A certified annotated FIRM, at the scale of the effective FIRM, that shows tile revised base
floodplain and floodway boundaries delineated ou the subnfitted work map
Please subnfit documentation of individual legal notice sent to all property owners affected by any
widening and/or shilling of the base floodplain tbr Grapevine Creek and/or increases in BFE. This
notice must include an explanation of the effects of the proposed project.
After receiving appropriate dncumentation to show that the project has been completed, FEMA will initiate
a revision to the FIRM FIS reprat. Because the BFEs would change as a result of the project, a 90-day
appeal period would bc initiated, during which comnmnity officials and interested persons may appeal thc
revised BFEs based on scientific or technical data.
This CLOMR is based on nfinimum floodplaiu managcmcnt criteria established under tile NFIP. Your
comnmnity is responsible fbr approving all tloodplain development and for ensuring all necessary permits
required by Federal or State law have been received. State, county, and community officials, based on
knowledge of local conditions and in the interest of sal;cty, may set higher standards for construction in the
SFItA. Il'the State, county, or community }las adopted more restrictive or comprehensive floodplain
management criteria, these criteria take precedence over tile miuimum NFIP criteria.
If you have any questions regarding fioodplain management regulations tbr your community or the NFIP in
general, please contact thc Consultation Coordination Officer (CCO) lbr your community. Inlbnnation on
the CCO for your community may be obtained by calling the Director, Federal Insurauce and Mitigation
4
Division of FEMA in Denton, Texas, at (940) 898-5127. If you have any questions regarding this
CLOMR, please call our Map Assistance (?enter, toll l?ee, at 1-877-FEMA MAP (1-877-336-2627).
Sincerely,
Max H. Yuan, P.E., Project Engineer
ttazard Identification Section
Mitigation Division
Emergency Preparedness
and Response Directorate
Enclosures
CC:
]'he Honorable Laura Miller
Mayor, City of Dallas
The Honorable Joe Putnam
Mayor City of Irving
Mr. Ken Griffin, P.E.
City Engineer
City of Coppell
Mr. Gary Fennell
Floodplain Administrator
City of hwing
Mr. Steve Parker
Floodplain Manager
City of Dallas
Mr. Walter E. Skipwith, ILl';.
Vice President
Halff Associates, lnc.
Mr. Henry Billingsley
Mr. Russell P. Erskinc
f lydrologist
l lalff Associates, Inc.
For:
Doug Bellomo, P.E., Chief
Hazard Identification Section
Mitigation Division
Emergency Preparedness
and Response Directorate