Page 1 of 5 Issue Date: July 27, 2012 Effective Date: December 10, 2012 Case No.: 11-06-4512P Follows Conditional Case No.: 06-06-B789R LOMR-APP Federal Emergency Management Agency Washington, D.C. 20472 LETTER OF MAP REVISION DETERMINATION DOCUMENT COMMUNITY AND REVISION INFORMATION PROJECT DESCRIPTION BASIS OF REQUEST COMMUNITY City of Coppell Dallas County Texas BRIDGE FILL BASE MAP CHANGES FLOODWAY HYDRAULIC ANALYSIS NEW TOPOGRAPHIC DATA COMMUNITY NO.: 480170 IDENTIFIER Bakers Branch / Denton Creek LOMR ANNOTATED MAPPING ENCLOSURES APPROXIMATE LATITUDE AND LONGITUDE: 32.985, -97.028 SOURCE: Precision Mapping Streets DATUM: NAD 83 ANNOTATED STUDY ENCLOSURES TYPE: FIRM* NO.: 48113C0135J DATE: August 23, 2001 DATE OF EFFECTIVE FLOOD INSURANCE STUDY: June 16, 2005 PROFILES: 46P, 128P AND 128P(A) FLOODWAY DATA TABLE: 8 Enclosures reflect changes to flooding sources affected by this revision. * FIRM - Flood Insurance Rate Map FLOODING SOURCE AND REVISED REACH Denton Creek from approximately 200 feet downstream of the confluence of Bakers Branch to approximately 1,200 feet upstream of the Lakeside Parkway SUMMARY OF REVISIONS Flooding Source Effective Flooding Revised Flooding Increases Decreases Denton Creek Zone AE Zone AE YES YES BFEs* BFEs YES YES Floodway Floodway YES YES Zone X (shaded) Zone X (shaded) YES YES * BFEs - Base Flood Elevations DETERMINATION This document provides the determination from the Department of Homeland Security's Federal Emergency Management Agency (FEMA) regarding a request for a Letter of Map Revision (LOMR) for the area described above. Using the information submitted, we have determined that a revision to the flood hazards depicted in the Flood Insurance Study (FIS) report and/or National Flood Insurance Program (NFIP) map is warranted. This document revises the effective NFIP map, as indicated in the attached documentation. Please use the enclosed annotated map panels revised by this LOMR for floodplain management purposes and for all flood insurance policies and renewals in your community. This determination is based on the flood data presently available. The enclosed documents provide additional information regarding this determination. If you have any questions about this document, please contact the FEMA Map Information exchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 847 South Pickett Street, Alexandria, VA 22304. Additional Information about the NFIP is available on our Web site at http://www.fema.gov/business/nfip. Stuart W. Rooney, CFM, PMP, Program Specialist Engineering Management Branch Federal Insurance and Mitigation Administration 11-06-4512P 102-I-A-C
Page 2 of 5 Issue Date: July 27, 2012 Effective Date: December 10, 2012 Case No.: 11-06-4512P LOMR-APP Federal Emergency Management Agency Washington, D.C. 20472 LETTER OF MAP REVISION DETERMINATION DOCUMENT (CONTINUED) OTHER COMMUNITIES AFFECTED BY THIS REVISION CID Number: 480195 Name: City of Lewisville, Texas AFFECTED MAP PANEL TYPE: FIRM* NO.: 48121C0685G DATE: April 18, 2011 TYPE: FIRM* NO.: 48113C0135J DATE: August 23, 2001 AFFECTED PORTIONS OF THE FLOOD INSURANCE STUDY REPORT DATE OF EFFECTIVE FLOOD INSURANCE STUDY: June 16, 2005 (Dallas County) DATE OF EFFECTIVE FLOOD INSURANCE STUDY: April 18, 2011 (Denton County) PROFILES: 02P, 03P, 04P, 05P, 46P, 128P AND 128P(A) FLOODWAY DATA TABLE: 8 CID Number: 480598 Name: City of Grapevine, Texas TYPE: FIRM* TYPE: FIRM* AFFECTED MAP PANEL NO.: 48121C0685G NO.: 48439C0110K DATE: April 18, 2011 DATE: September 25, 2009 AFFECTED PORTIONS OF THE FLOOD INSURANCE STUDY REPORT DATE OF EFFECTIVE FLOOD INSURANCE STUDY: April 18, 2011 (Denton County) DATE OF EFFECTIVE FLOOD INSURANCE STUDY: September 25, 2009 (Tarrant County) PROFILES: 46P, 128P AND 128P(A) FLOODWAY DATA TABLE: 8 CID Number: 480777 Name: Town of Flower Mound, Texas TYPE: FIRM* TYPE: FIRM* TYPE: FIRM* AFFECTED MAP PANELS NO.: 48439C0110K NO.: 48121C0685G NO.: 48113C0135J DATE: September 25, 2009 DATE: April 18, 2011 DATE: August 23, 2001 AFFECTED PORTIONS OF THE FLOOD INSURANCE STUDY REPORT DATE OF EFFECTIVE FLOOD INSURANCE STUDY: June 16, 2005 (Dallas County) DATE OF EFFECTIVE FLOOD INSURANCE STUDY: April 18, 2011 (Denton County) DATE OF EFFECTIVE FLOOD INSURANCE STUDY: September 25, 2009 (Tarrant County) PROFILES: 02P, 03P, 04P, 05P, 46P, 128P AND 128P(A) FLOODWAY DATA TABLE: 8 This determination is based on the flood data presently available. The enclosed documents provide additional information regarding this determination. If you have any questions about this document, please contact the FEMA Map Information exchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 847 South Pickett Street, Alexandria, VA 22304. Additional Information about the NFIP is available on our Web site at http://www.fema.gov/business/nfip. Stuart W. Rooney, CFM, PMP, Program Specialist Engineering Management Branch Federal Insurance and Mitigation Administration 11-06-4512P 102-I-A-C
Page 3 of 5 Issue Date: July 27, 2012 Effective Date: December 10, 2012 Case No.: 11-06-4512P LOMR-APP Federal Emergency Management Agency Washington, D.C. 20472 LETTER OF MAP REVISION DETERMINATION DOCUMENT (CONTINUED) COMMUNITY INFORMATION APPLICABLE NFIP REGULATIONS/COMMUNITY OBLIGATION We have made this determination pursuant to Section 206 of the Flood Disaster Protection Act of 1973 (P.L. 93-234) and 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. Pursuant to Section 1361 of the National Flood Insurance Act of 1968, as amended, communities participating in the NFIP are required to adopt and enforce floodplain management regulations that meet or exceed NFIP criteria. These criteria, including adoption of the FIS report and FIRM, and the modifications made by this LOMR, are the minimum requirements for continued NFIP participation and do not supersede more stringent State/Commonwealth or local requirements to which the regulations apply. We provide the floodway designation to your community as a tool to regulate floodplain development. Therefore, the floodway revision we have described in this letter, while acceptable to us, must also be acceptable to your community and adopted by appropriate community action, as specified in Paragraph 60.3(d) of the NFIP regulations. NFIP regulations Subparagraph 60.3(b)(7) requires communities to ensure 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 ordinances; therefore, responsibility for maintenance of the altered or relocated watercourse, including any related appurtenances such as bridges, culverts, and other drainage structures, rests with your community. We may request that your community submit a description and schedule of maintenance activities necessary to ensure this requirement. COMMUNITY REMINDERS We based this determination on the 1-percent-annual-chance flood discharges computed in the FIS for your community without considering subsequent changes in watershed characteristics that could increase flood discharges. Future development of projects upstream could cause increased flood discharges, which could cause increased flood hazards. A comprehensive restudy of your community s flood hazards would consider the cumulative effects of development on flood discharges subsequent to the publication of the FIS report for your community and could, therefore, establish greater flood hazards in this area. Your community must regulate all proposed floodplain development and ensure that any permits required by Federal or State/Commonwealth law have been obtained. State/Commonwealth or 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 your State/Commonwealth or community has adopted more restrictive or comprehensive floodplain management criteria, those criteria take precedence over the minimum NFIP requirements. We will not print and distribute this LOMR to primary users, such as local insurance agents or mortgage lenders; instead, the community will serve as a repository for the new data. We encourage you to disseminate the information in this LOMR by preparing a news release for publication in your community's newspaper that describes the revision and explains how your community will provide the data and help interpret the NFIP maps. In that way, interested persons, such as property owners, insurance agents, and mortgage lenders, can benefit from the information. This determination is based on the flood data presently available. The enclosed documents provide additional information regarding this determination. If you have any questions about this document, please contact the FEMA Map Information exchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 847 South Pickett Street, Alexandria, VA 22304. Additional Information about the NFIP is available on our Web site at http://www.fema.gov/business/nfip. Stuart W. Rooney, CFM, PMP, Program Specialist Engineering Management Branch Federal Insurance and Mitigation Administration 11-06-4512P 102-I-A-C
Page 4 of 5 Issue Date: July 27, 2012 Effective Date: December 10, 2012 Case No.: 11-06-4512P LOMR-APP Federal Emergency Management Agency Washington, D.C. 20472 LETTER OF MAP REVISION DETERMINATION DOCUMENT (CONTINUED) This revision has met our criteria for removing an area from the 1-percent-annual-chance floodplain to reflect the placement of fill. However, we encourage you to require that the lowest adjacent grade and lowest floor (including basement) of any structure placed within the subject area be elevated to or above the Base (1-percent-annual-chance) Flood Elevation. We have designated a Consultation Coordination Officer (CCO) to assist your community. The CCO will be the primary liaison between your community and FEMA. For information regarding your CCO, please contact: Mr. Frank Pagano Director, Mitigation Division Federal Emergency Management Agency, Region VI Federal Regional Center, Room 206 800 North Loop 288 Denton, TX 76209 (940) 898-5127 STATUS OF THE COMMUNITY NFIP MAPS We are processing a revised FIRM and FIS report for Dallas County, Texas, in our countywide format; therefore, we will not physically revise and republish the FIRM and FIS report for your community to incorporate the modifications made by this LOMR at this time. Preliminary copies of the revised countywide FIRM and FIS report were submitted to your community for review on September 28, 2010. We will incorporate the modifications made by this LOMR into the countywide FIRM and FIS report before they become effective. This determination is based on the flood data presently available. The enclosed documents provide additional information regarding this determination. If you have any questions about this document, please contact the FEMA Map Information exchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 847 South Pickett Street, Alexandria, VA 22304. Additional Information about the NFIP is available on our Web site at http://www.fema.gov/business/nfip. Stuart W. Rooney, CFM, PMP, Program Specialist Engineering Management Branch Federal Insurance and Mitigation Administration 11-06-4512P 102-I-A-C
Page 5 of 5 Issue Date: July 27, 2012 Effective Date: December 10, 2012 Case No.: 11-06-4512P LOMR-APP Federal Emergency Management Agency Washington, D.C. 20472 LETTER OF MAP REVISION DETERMINATION DOCUMENT (CONTINUED) PUBLIC NOTIFICATION OF REVISION PUBLIC NOTIFICATION A notice of changes will be published in the Federal Register. This information also will be published in your local newspaper on or about the dates listed below and through FEMA s Flood Hazard Mapping Web site at https://www.floodmaps.fema.gov/fhm/scripts/bfe_main.asp. LOCAL NEWSPAPER Name: The Citizens Advocate Dates: 08/03/2012 and 08/10/2012 Within 90 days of the second publication in the local newspaper, a citizen may request that we reconsider this determination. Any request for reconsideration must be based on scientific or technical data. Therefore, this letter will be effective only after the 90-day appeal period has elapsed and we have resolved any appeals that we receive during this appeal period. Until this LOMR is effective, the revised BFEs presented in this LOMR may be changed. This determination is based on the flood data presently available. The enclosed documents provide additional information regarding this determination. If you have any questions about this document, please contact the FEMA Map Information exchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 847 South Pickett Street, Alexandria, VA 22304. Additional Information about the NFIP is available on our Web site at http://www.fema.gov/business/nfip. Stuart W. Rooney, CFM, PMP, Program Specialist Engineering Management Branch Federal Insurance and Mitigation Administration 11-06-4512P 102-I-A-C
) * 1 / 0 7 4 5 6 7 2 6 9 8 7 6 ; 6 < 6 < 6 < 8 6 9 = > 6 < = 6 < 6 4 @ B 4 9 @ 8 8 8 8 8? 8? & # $ & FLOODING SOURCE CROSS SECTION DISTANCE WIDTH (FEET) FLOODWAY SECTION AREA (SQUARE FEET) MEAN VELOCITY (FEET PER SECOND) BASE FLOOD WATER SURFACE ELEVATION REGULATORY WITHOUT FLOODWAY WITH FLOODWAY INCREASE Bakers Branch A 3,570 1 210 1,459 3.9 477.1 477.1 477.6 0.5 B 6,421 1 149 1,476 3.8 485.9 485.9 486.7 0.8 C 8,230 1 99 1,090 5.2 493.6 493.6 494.4 0.8 D 10,180 1 80 688 8.2 504.7 504.7 505.5 0.8 E 11,690 1 80 805 4.8 521.6 521.6 522.3 0.7 F 12,700 1 100 682 5.6 529.0 529.0 529.8 0.8 G 13,650 1 70 602 5.5 532.2 532.2 532.8 0.6 H 15,070 1 80 542 6.1 540.7 540.7 541.3 0.6 I 16,240 1 99 573 4.0 550.0 550.0 550.4 0.4 J 18,250 1 35 283 8.1 557.3 557.3 557.3 0.0 ' ( -. 2 3 6 3 : 3 5 3 = 3 9 3 4@ 3A 2 C 3 A, + B Bryant Branch A 3,170 2 * 3 * 3 * 3 538.5 538.5 539.5 1.0 B 5,290 2 250 13,384 2.7 548.4 548.4 549.3 0.9 C 6,700 2 250 20,238 1.8 573.4 573.4 573.4 0.0 D 7,930 2 230 15,983 0.4 573.4 573.4 573.4 0.0 1 Feet above confluence with Denton Creek 2 Feet above City of Corinth corporate limits 3 Floodway within government property fee and/or flowage easement limits FEDERAL EMERGENCY MANAGEMENT AGENCY DENTON COUNTY, TEXAS AND INCORPORATED AREAS FLOODWAY DATA Bakers Branch - Bryant Branch 58 $ % # "
" # " $ # % & '& ( ) & * +, -., +.
& $ # & FLOODING SOURCE CROSS SECTION DISTANCE WIDTH (FEET) SECTION AREA (SQUARE FEET) MEAN VELOCITY (FEET PER SECOND) REGULATORY WITHOUT FLOODWAY WITH FLOODWAY INCREASE Denton Creek (Below Grapevine Lake) A 21,260 2 434 6,816 4.1 453.3 453.3 453.4 0.1 B 22,370 2 337 5,026 4.1 453.5 453.5 453.6 0.1 C-E 1 F 39,200 2 499 3,198 3.2 468.3 468.3 468.8 0.5 G 47,210 2 1,300 5,966 1.6 470.4 470.4 471.1 0.7 Doe Branch A 40,600 3 1,100 8,589 1.8 931.6 931.6 932.5 0.9 B 43,800 3 628 5,443 2.9 932.6 932.6 933.5 0.9 C 46,200 3 566 4,101 3.8 555.9 555.9 556.9 1.0 D 51,100 3 500 4,155 3.8 566.0 566.0 566.7 0.7 Dry Fork Hickory Creek A 4,750 4 675 3,549 4.9 581.0 580.3 5 581.2 5 0.9 B 6,500 4 450 3,699 4.2 587.0 587.0 587.4 0.4 C 8,600 4 500 3,942 3.7 592.0 592.0 593.0 1.0 D 10,750 4 326 2,884 5.1 597.8 597.8 598.1 0.3 E 13,700 4 425 2,766 5.2 604.5 604.5 605.5 1.0 F 16,550 4 350 2,998 4.8 613.5 613.5 614.0 0.5 G 18,600 4 425 3,412 4.2 615.6 615.6 616.4 0.8 H 20,400 4 450 2,869 5.0 619.5 619.5 620.0 0.5 I 24,080 4 400 2,784 3.8 625.6 625.6 626.1 0.5 J 28,990 4 300 1,493 4.6 637.1 637.1 637.9 0.8 K 34,300 4 599 2,259 3.1 649.2 649.2 649.6 0.4 L 38,700 4 410 2,698 2.3 660.7 660.7 661.7 1.0 1 Cross sections C through E are located in Dallas County 4 Feet above confluence with Hickory Creek 2 Feet above confluence with Elm Fork Trinity River 5 Elevation computed without consideration of backwater from Hickory Creek 3 Feet above Little Elm Creek FLOODWAY BASE FLOOD WATER SURFACE ELEVATION, ( + * ) ( ' -. -, FEDERAL EMERGENCY MANAGEMENT AGENCY DENTON COUNTY, TEXAS AND INCORPORATED AREAS $ % # " FLOODWAY DATA Denton Creek (Below Grapevine Lake) - Doe Branch Dry Fork Hickory Creek 63
Legend 1% annual chance (100-Year) Floodplain ZONE AE 486 Bakers Branch REVISED AREA ZONE AE, B 483 476, A 475 473 471 TOWN OF FLOWER MOUND CITY OF LEWISVILLE Denton Creek Tributary 1 470 ZONE X ZONE A 470 470 1% annual chance (100-Year) Floodway 0.2% annual chance (500-Year) Floodplain APPROXIMATE SCALE IN FEET 1000 500 0 1000 NATIONAL FLOOD INSURANCE PROGRAM FIRM FLOOD INSURANCE RATE MAP FEET LIMIT OF FLOODWAY 473 TOWN OF FLOWER MOUND TARRANT COUNTY 473 CITY OF GRAPEVINE TARRANT COUNTY DALLAS COUNTY TOWN OF FLOWER MOUND 472 471 470 472 ZONE AE 471 471 DENTON COUNTY DALLAS COUNTY, G Denton Creek CITY OF LEWISVILLE LAKESIDE PARKWAY CITY OF COPPELL DALLAS COUNTY, TEXAS AND INCORPORATED AREAS PANEL 135 OF 725 (SEE MAP INDEX FOR PANELS NOT PRINTED) CONTAINS: COMMUNITY NUMBER PANEL SUFFIX COPPELL, CITY OF 480170 0135 J DALLAS, CITY OF 480171 0135 J IRVING, CITY OF 480180 0135 J REVISED TO REFLECT LOMR EFFECTIVE: MAP NUMBER 48113C0135 J EFFECTIVE DATE: AUGUST 23, 2001 Federal Emergency Management Agency