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Creekview Add PD-CS 880701The Honorable Lou Duggan Mayor of the City of Coppell P.O. Box 478 Coppell, Texas 75019 Federal Emergency M.g...n_agement Ageing, Washington,jj[. ~DX}'?20~}~?"~'''~% v ~.~',}~e ~O. 88-06-37R Dear Mayor Duggan: / ~is is in reference to a February 2, 1988 letter fr~ Mr. H. Wayne G~nn~,~3~.~ / P.E., City Engineer and Floodplain Administrator for the City of Cop~ll. / In his letter, which was forwarded to us by our Region VI office, Mr. Ginn / r~uest~ ~at the Federal ~ergency Management A e~c .... ditional ~tter of Map Revision (L~) for the~~ew Addition project~ This project consists of channel modifications t~rap~~~ Moore Road and Denton Tap Road. Wi~ his February ~, 1988 letter, Mr. Ginn s~mitt~ a technical report prepared by Na~an D. Maier Consulting ~gineers, Inc., entitled Floodp!a~n Reclamation Study for ~e Creek View Addition Alon~ Grapevine Creek, dat~ Nove~er 1987. ~is report included ~e following technical data: H~-2 hydraulic models, dat~ Nove~er 10, 1987, representing existing conditions; H~-2 hydraulic models, dat~ January 16, 1988, repre- senting proposed conditions; a Floodplain Reclamation Plan, dat~ January 1988; cross-sectional info~ation for Grapevine Creek; and a flood profile for Grapevine CreW. Following a May 11, 1988 telephone conversation wi~ our technical evaluation contractor, Mr. Dennis L. Johnson, P.E., of Na~an D. Maier Consulting Engineers, Inc., s~mitted additional H~-2 hydraulic models, dat~ May 18, 1988, representing both existing and propos~ conditions. Based on our review of the submitted technical data, we have determined that the proposed Creek View Addition project meets the minimum floodplain management criteria set forth by National Flood Insurance Program (NFIP) regulations. If the project were completed as proposed, a revision to the effective Flood Insurance Study (FIe), Flood Insurance Rate Map (FIRM), and Flood Boundary and Floodway Map (FBFM) for your community would be warranted. This revision would show a decrease in the Base (100-year) Flood Elevations and the 100-year floodplain of Grapevine Creek; however, there would be no change in the floodway width, as indicated in the submitted hydraulic calculations. Please note that future revisions to your community's FIS, FIRM, and FBFM or f~ure restudies'of the flood hazards in this area could modify this determination. This determination is based on the 100-year flood discharges computed' in the effective FIe for your community, and does not consider subsequent changes in watershed characteristics that would tend to increase flood discharges. The development of this project and other projects upstream could result in increased flood discharges, which, in turn, could result in increased 100-year flood elevations. Future restudies of your community's flood hazards would take into account the cumulative effects of development on flood discharges, and could therefore establish higher 100-year flood elevations in this area. This conditional LOMR is based on minimum floodplain management criteria established under the NFIP. Your community is responsible for approving all proposed floodplain developments, including the project upon which this request is based, and for assuring that necessary permits required by Federal or State law have been received. State and community officials, based on knowledge of local conditions and in the interest of safety, may set higher standards for construction or may limit development in floodplain areas. If the State of Texas or the City of Coppell has adopted more restrictive or comprehensive floodplain management criteria, these criteria take precedence over the minimum NFIP requirements. NFIP regulation Part 60.3(b)(7) requires communities participating in the Program to "assure that the flood carrying capacity within the altered or relocated portion of any watercourse is maintained." Without proper mainte- nance, such as the regular clearing of a channelized stream, channel modifi- cation projects will, in time, f~il to function as designed, thereby recreating the flood hazard that they were intended to mitigate. Therefore, upon com- pletion of the project, your community must uphold its responsibility for assuring that the modified channel is maintained in order to preserve its design function. Upon completion of the proposed Creek View Addition project, your community may request a revision to the effective FIS, FIRM, and FBFM. The revision request must include supporting data outlined in the enclosed copy of Part 65 of the NFIP regulations. Please note that these supporting data must represent the conditions of the area as they exist at the time the request is submitted. Compliance with the criteria outlined in the aforementioned regulations will expedite FEMA's review process, thus allowing the effective FIS, FIRM, and FBFM for your community to be revised as appropriate, in a timely manner. Should you have any questions regarding this matter, please do not hesitate to contact the Chief, Natural and Technological Hazards Division of the Federal Emergency Management Agency in Denton, Texas, at (817) 898-9127 or members of our Headquarters staff in Washington, D.C., at (202) 646-2754. Sincerely, C~, Risk Studies Division Federal Insurance Administration Enclosure cc: Mr. H. Wayne Ginn, P.E. Mr. Dennis L. Johnson, P.E. NOTICE OF SUSPENSION JUNE 30, 1987 - SEPTEMBER 30, 1988 On June 30, 1987, the Federal Faaergency Management Agency published a notice in the. FEDERAL REGISTER, effective that dace, suspending until Hatch 31, 1988· elevation requirements for ~anufactured homes in existing mobile h_9o~e parks or Subdi. visi~_QllS~. The affected regulation had gone into effect on October I · 1986. Since the FEDERAL REGISTER notice· Pres- iden~/Reagan signed the Supplemental Appro- priations Act of 1987 (H.R. 1827) which became Public Law (P.L.) 100-71 on July 11 ,,: 1987. Consequently· the manufactured home regulation suspension date published in the FEDERAL REGISTER will be extended to coincide with the September 30, 1988 date in P.L. 100-71. SIRiMARY: This notice suspends revisions to National Flood Insurance Program (NFIP) regulations regarding the elevation of manufactured homes placed in existing mobile home parks and subdivisions in special flood hazard areas ~ttch became effective on October I, 1986 until March 31, 1988 and restores certain prior provisions. In order to seek additional public input, comments are requested on the impacts of the October 1, 1986 rule revision on owners of existing ~obile home parks, owners and renters ot individual mobile homes, government expenditures, and public safety. SEE AMENDMENT AND SUSPENSION NOTICE ON NEXT Federal Register / Vol..~,~ No. 125 / Tuesday, June 30, 1987 ~,~Rules and Regulations FEDERAL EMERGENCY MANAGEMENT AGENCY 44 CFR Parts 59 and 60 [Docket No. FEMA-FIA] National Flood Insurance Program; Elevation Requirements for - Manufactured Homes in Existing Mobile Home Parks or.Subdivisions; Suspension of Rule and Amendment of Rule With Request for Comments AGENCY: Federal Emergency Management Agency (FEMA). AC'nON: Suspension of Rule: Amendment of Rule with Request for Comments. List of Subjects ;n 44 CFR Parts 59 and FloOd insurance. Accordingly, Title 44, Code of Federal Regulations is amended as follows: PART 59--GENERAL PROVISIONS The authority citation for Part 59 con~nues to read as follows: Authority: 42 U.S.C. 4001 et seq.; Reorganization Plan No. 3 of 1978: E.O. 12127. § 5g.~ 1. Section 59.1 is amended as follows: a. By adding alphabetically, a definition of "existing manufactured home park or subdivision" to read as follows: "Existing manufactured home park or subdivision" means a manufactured home park for which the construction of facilities for servicing the lot on which the manufactured homes are to be affixed [including, at a minimum, the installation of utilities, either final site grading or the pouring of concrete pads, and the construction of streets} are completed before the effective date of floodplain management regulations adopted by a community. b. By adding alphabetically, a definition Of "Expansion to. an existing manufactured, home park or subdivision" to read as follows: "F.~pansion to an existing manufactured home park or subdivision" me~_ns the prepm~tion of additional sites by the construction of facilities for servicing the lot~ on which the manufactured homes are ~o be affixed [includi~ the installation of utilities, either f'mal site grading or pouri~ o! concrete pads, or the consUvclion of streets]. PART 60--CRITERIA FOR LAND MANAGEMENT AND USE The authority citation for Part 60 continues to read as follows: A~hmlfy:'42 U.S.C. 4o01 et seq.; Reor~aization Plan No. 3 of 197& E.O. 2. Section 60:3(c][6) is suspended. 3. Section 60.3(c](1Z] is added to read as follows: § 60.3 Floodplain management crltmia for (C) * * * (12) Require that all manufactured homes to be placed or substantially improved within Zones A1-30, AH, and AE on the community's FIRM be elevated on a permanent foundation such that the lowest floor of the manufactured home is at or above the base flood elevation: and be securely anchored to an adequately anchored foundaUon system in accordance with the provisions of paragraph lb)(8) of this section. This paragraph applies to manufactured homes to be placed or substantially improved in an expansion to an existing manufactured home park or subdivision. This paragraph does not apply to manufactured homes to be placed or substantially improved in an existin.a manufactured home park or subdivision except where the repair, reconstruction, or improvement of the streets, utilities and pads equals or exceeds 50 percent of the value of the streets, utilities and pads before the repair, reconstruction or improvement has commenced. Fedeng lntutotwe Administrotor.