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Lakes of C 1stP-CS 850408 Federal Emergency Management Agency Washington, D.C. 20472 CERTIFIED MAIL IA-RA-RS (102a) RETURN RECEIPT REQUESTED Community: City of Coppell, ~onorable Andrew Brown Dallas & Denton Mayor of the City of __~.~ Counties, Texas P.O. Box 478~ Effective Date of Coppell, Texas 75019 this Revisions 4/8/85 Community Number: 480170 Dear Mayor Brown: Suffix Codex C This is in response to a letter December 17, 1984, submitted by Mr. H. Wayne Ginn, P.E., City Engineer of Coppell, Texas. In his letter, Mr. Ginn requested that the Federal Emergency Management Agency (FEMA) issue a Letter of Map Revision (LOMR) for the effective Flood Insurance Study (FIS) of Coppell concerning a tract of land known as the Lakes of Coppell along Denton Creek. This request results from a new hydraulic analysis of the Elm Fork of the Trinity River which has a significant impact on the flood hazard potential within the Lakes of Cop~ell tract. We have reviewed the technical report submitted by Mr. Ginn, entitled "Flood- plain Reclamation Study, Lakes of Coppell," dated December 1984, prepared by Nathan D. Maier Consulting Engineers, Inc. The report includes hydraulic modeling of the Elm Fork of the Trinity River, cross-section plots and a boundary survey of the Lakes of Coppell tract. On March 21, 1985, we received final hydraulic models, dated March 20, 1985, which indicated that floodway elevations would not be affected by narrowing the floodway within the Lakes of Coppell property. Therefore, the effective Flood Boundary and Floodway Map (FBFM) number 480170, Panel 0005, dated February 15, 1984, for the City of Coppell, has been revised by way of this LOMR to reflect a new floodway boundary. The floodway boundary on the west side of the Elm Fork of the Trinity River downstream of cross section E has been narrowed as shown in the enclosed annotated copies of your community's effective FBFM. It should be noted that an on-going reclamation project in the lower part of the Denton Creek flood plain will, when complete, warrant a modification to the 100-year (base flood) and 500-year flood boundaries in this area. Please be aware that the fill elevation should correspond to the higher BFEs result- ing from the updated rating curve at.t~e Carrollton gage prepared by the U.S. Geological Survey in 1982. These modified flood boundaries will be incor- porated, with the floodway changes described in this LOMR, into a physical map revision for your community. This modification 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. 2 As required by the legislation, a community must adopt and enforce flood plain management measures in order to ensure continued eligiblity 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 desig- nations in the special flood hazard areas as shown on your community's FIRM, including the modifications made by this letter of map revision. This modification is effective as of the date of this letter. However, a review of this determination and any requests for changes should be made within 30 days. Any requests for reconsideration must be based on scientific or technical data. The community number and suffix code listed above will be used for all flood insurance policies and renewals issued for your community. A Consultation Coordination Officer (CCO) has been designated to assist you with any problems you may have concerning this modification. The CCO will he the primary liaison between your community and the Federal Emergency Manage- ment Agency. Your CCD is: Mr. Dell Greer, Chief FEMA, Natural & Technological Hazards Division Federal Regional Center 800 North Loop 288 Denton, Texas 76201 (817) 387-5811 Any questions may be directed to your CCO. Sincerely, Acting Chief, Risk Studies Division Federal Insurance Administration Enc los ur es Mr. Dennis L. Johnson, P.E., Nathan D. Maier Consulting Engineers, Inc. Mr. H. Wayne Ginn, P.E., City Engineer, Ginn Inc.