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Parks Coppell ABQ-CS 870924' Federal Emergency Manage Washington, D.C. 20472 SEP CE~T. IFI~n MAIL IA-RA-RS (102) ~ ]~CEIPT REQUESTED Community.- City of Coppell, The Honorable Lou Duggan Denton County, Mayor of the City of Coppell Texas P.O. Box 478 Map Panel N,,mher: 480170 0005 C Coppell, Texas 75019 Effective Date of this Revision: September 24, 1987 Dear Mayor Duggan: This is in reference to a letter dated December 10, 1986, and technical data submitted by Ms. Shohre Daneshmand, City Civil Engineer for the City of Coppell, regarding the Flood Insurance Study (FIS) for your community. In her letter, Ms. Daneshmand requested that the Federal Emergency Management Agency (FEMA) issue a Letter of Map Amendment (LO, A) to incorporate completed channel and floodplain modifications along Denton Creek. The area of concern for this request . ~..~]. - - ------All necessary materials to process t~ls reque w~re received as of June 29, 1987. It should be noted that a LOMA is issued only to remove the Special Flood Hazard Area (SFHA) designation, shown on the effective Flood Insurance Rate Map (FIRM), from an area occupied by a particular structure if it is above the existing Base (100-year) Flood Elevation (BFE). Because this request is based on a completed channel modification, which results in a reduction in the BFEs and the 100- and 500-year floodplain delineations along a portion of Denton Creek, a Letter of Map Revision (LC~dR) to the FIS, FIRM, and Flood Boundary and Floodway Map (FBFM) is being issued in lieu of a LOMA. A LOMR is needed to revise the BFEs and 100- and 500-year floodplain delineations along Denton Creek based on changes in the hydraulic parameters used in the effective FIS, FIRM, and FBFM for your co~munity. We have reviewed the submitted data that w~re prepared by Threadgill-Dowdey & Associates, which included the following..- H~C-2 hydraulic modeling of pre- and post-channel modification conditions, dated June 29, 1987; and topographic mapping, dated September 12, 1986, representing the proposed changes to the FIS, FIRM, and FBFM. Based on these data the BFEs and 100-year floodway elevations, and the 100-year (Zone A3) and 500-year (Zone B) floodplains along Denton Creek have been revised for a distance of approximately 1.6 l/les downstream of Denton Tap Road. This ~ amends FIRM and FBFM n~mber 480170, panel 0005 and the FIS text, all of which are dated February 15, 1984. These changes are shown On the enclosed flood profile sheets; annotatad FIS text Table 2, entitled "Floodway Data";. annotated portion of FIRM ~anel 0005 C; and annotated portion of FBFM panel 0005. Please note that the lo~at~ons of the Denton Creek cross sections B and C have been revised, aI ihown on the enclosures. Anderson Engineers, Inc., is currently restudying several streams within the City of Coppell, including Denton Creek; the analyses for the restudied. streams are to be submitted to FEMA by your community for our review. The analyses will then be used as the basis for a revision to Coppell's FIS, FIRM, and FBFM. This LOMR will be superseded by the revised FIS, FIRM, and FBFM based on the Anderson Engineers analyses. Public notification of this LOMR will be given in The Citizens Advocate on or about October 9, 1987, and October 16, 1987. A copy of this notification is enclosed. In addition, notice of changes will be published in the Federal Register. We encourage you to supplement this notification by preparing an article for publication in the community newspaper. This article should describe the changes that have been made and what assistance the community can give in providing data and interpreting the maps. It should be noted that National Flood Insurance Program regulation 44 CFR 60.3(b)(7) requires communities to "assure that the flood carrying capacity within the altered or relocated portion of any watercourse is maintained." This provision is incorporated into your community's existing floodplain management regulations; consequently, responsibility for maintenance of the modified channel rests with your community. The revised BFEs are effective as of the date of this letter; however, within 90 days of the second publication in The Citizens Advocate, a citizen may request that FEMA reconsider the determination made by this LOMR. Any request for reconsideration must be based on scientific or technical data. All interested parties are on notice that until the 90-day period elapses, FEMA's determination to modify the BFEs presented in this LOMR may itself be .modified. Since this LOMR will not be printed and distributed to users such as insurance agents and lenders, the community will serve as a repository for the new data. We encourage you to disseminate widely throughout the community the informa- tion reflected by this LOMR in order that interested persons may offer new information or comments. The determination made in this LOMR has been made pursuant to Section 206 of the Flood Disaster Protection Act of 1973 (P.L. 93-234) and is in accordance with the National Flood Insurance Act of 1968, as amended (Title XIII of the Housing and Urban Development Act of 1968, P.L. 90-448), 42 U.S.C. 4001-4128, and 44 CFR Part 65. As required by this legislation, a community must adopt and enforce floodplain management regulations in order to ensure continued eligibility to participate in the National Flood Insurance Program. Therefore, the City of Coppell must enforce these regulations using, at a minimum, the elevations and zone designations in the SFHAs as shown on your community's FIRM, including the modifications made by this LOMR. The map as listed above and as amended by this letter will be used for all flood insurance policies and renewals issued for your community. 3 A Consultation Coordination Officer has been designated to assist you with any problems you may have concerning this LOMR. This officer will be the primary F~A contact for your community, and can be reached at the following address: Mr. Alton S. Ray, Acting Chief FEMA, Natural & Technological Hazards Division Federal Regional Center 800 North Loop 288 Denton, Texas 76201 (817) 898-9127 Any questions may be directed to your Consultation Coordination Officer. Sincerely, J~ks Chief, Risk Studies Division Federal Insurance Administration Enclosures cc: Ms. Shohre Daneshmand Mr. Art Whitney, Roberts & Do~dey Mr. Carl V. Anderson, P.E., Anderson Engineers, Inc. REVISED TO REFLECT LOUR DATED FIRM FLOOD INSURANCE RATE MAP ZONE ,APPROXIMATE SCALE ,ox, o ,oDe,[E? CiTY OF '--'- ~ ' ' COPPELL, TEXAS DALLAS AND DENTOh O~TO~ ¢0 COUNTIES ONLY PANEL PRINTED ZONE B COMMUNITY-PANEL NUMBER ,,.r,w. 480170 0005 C ~e. ea ~¥~ MAP REVISED: ~, FEBRUARY 15,1984 ~LLOW ~N ~"