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Transcription:

Page 1 of 5 Issue Date: June 21, 2013 Follows Conditional Case No.: 04-06-A148R DETERMINATION DOCUMENT COMMUNITY COMMUNITY AND REVISION INFORMATION City of Irving Dallas County Texas FILL PROJECT DESCRIPTION BASIS OF REQUEST FLOODWAY HYDRAULIC ANALYSIS NEW TOPOGRAPHIC DATA COMMUNITY NO.: 480180 IDENTIFIER MacArthur Center ANNOTATED MAPPING ENCLOSURES APPROXIMATE LATITUDE AND LONGITUDE: 32.953, -96.967 SOURCE: Precision Mapping Streets DATUM: NAD 83 ANNOTATED STUDY ENCLOSURES TYPE: FIRM* NO.: 48113C0155 J DATE: August 23, 2001 DATE OF EFFECTIVE FLOOD INSURANCE STUDY: June 16, 2005 PROFILES: 211P AND 212P FLOODWAY DATA TABLE: 8 Enclosures reflect changes to flooding sources affected by this revision. * FIRM - Flood Insurance Rate Map FLOODING SOURCE AND REVISED REACH Grapevine Creek - from approximately 350 feet upstream of MacArthur Boulevard to approximately 950 feet downstream of Moore Road SUMMARY OF REVISIONS Flooding Source Effective Flooding Revised Flooding Increases Decreases Grapevine Creek Zone AE Zone AE YES YES Zone X (shaded) Zone X (shaded) YES YES BFEs* BFEs YES YES Floodway Floodway YES YES * BFEs - Base Flood Elevations DETERMINATION This document provides the determination from the Department of Homeland Security's (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 panel revised by this LOMR for floodplain management purposes and for all flood insurance policies and renewals in your community.

Page 2 of 5 Issue Date: June 21, 2013 DETERMINATION DOCUMENT (CONTINUED) OTHER COMMUNITIES AFFECTED BY THIS REVISION CID Number: 480170 Name: City of Coppell, Texas AFFECTED MAP PANELS AFFECTED PORTIONS OF THE FLOOD INSURANCE STUDY REPORT TYPE: FIRM* NO.: 48113C0155 J DATE: August 23, 2001 DATE OF EFFECTIVE FLOOD INSURANCE STUDY : June 16, 2005 PROFILES: 211P AND 212P FLOODWAY DATA TABLE: 8 CID Number: 480171 Name: City of Dallas, Texas AFFECTED MAP PANELS AFFECTED PORTIONS OF THE FLOOD INSURANCE STUDY REPORT TYPE: FIRM* NO.: 48113C0155 J DATE: August 23, 2001 DATE OF EFFECTIVE FLOOD INSURANCE STUDY : June 16, 2005 PROFILES: 211P AND 212P FLOODWAY DATA TABLE: 8

Page 3 of 5 Issue Date: June 21, 2013 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. 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 permits required by Federal and/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 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.

Page 4 of 5 Issue Date: June 21, 2013 DETERMINATION DOCUMENT (CONTINUED) 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, 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, and Incorporated Areas, 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 countywide FIRM and FIS report, which present information from the effective FIRMs and FIS reports for your community and other incorporated communities in Dallas County, 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.

Page 5 of 5 Issue Date: June 21, 2013 DETERMINATION DOCUMENT (CONTINUED) PUBLIC NOTIFICATION OF REVISION 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 Dallas Morning News Dates: 06/28/2013 and 07/05/2013 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 flood hazard determination information presented in this LOMR may be changed.

FLOODING SOURCE FLOODWAY BASE FLOOD WATER SURFACE ELEVATION CROSS SECTION DISTANCE WIDTH (FEET) SECTIONAREA (SQUARE FEET) MEAN VELOCITY (FEET PER SECOND) REGULATORY WITHOUT FLOODWAY WITH FLOODWAY Glenn Branch A 680 1 64 576 8.2 636.8 636.8 637.8 1.0 B 1,940 1 58 531 8.1 644.4 644.4 645.2 0.8 C 2,750 1 55 343 8.6 650.4 650.4 651.2 0.8 D 3,670 1 69 464 6.4 658.7 658.7 659.6 0.9 E 5,100 1 130 479 6.2 688.9 688.9 689.9 1.0 Grapevine Creek A 8,500 2 300 1,778 5.5 439.6 438.5 3 438.5 3 0.0 B 12,920 2 549 3,002 3.2 448.8 448.8 448.8 0.0 C 14,458 2 550 3,028 3.6 454.4 454.4 455.1 0.7 D 16,575 2 595 3,628 3.0 460.9 460.9 461.6 0.7 E 20,700 2 370 3,063 3.9 471.5 471.5 472.3 0.8 F 22,700 2 200 1,566 7.5 478.0 478.0 478.4 0.4 G 24,000 2 349 2,498 4.7 482.5 482.5 482.9 0.4 H 26,851 2 136 1,061 11.2 488.3 488.3 488.4 0.1 I 31,680 2 239 2,982 3.5 508.2 508.2 508.5 0.3 J 40,780 2 630 3,245 2.2 532.4 532.4 533.1 0.7 K 45,970 2 250 1,022 6.9 543.1 543.1 543.2 0.1 L 46,710 2 220 1,777 4.0 545.1 545.1 545.7 0.6 Tributary G-1 of Grapevine Creek A 954 4 137 777 4.0 493.7 493.7 493.7 0.0 B 3,125 4 82 432 7.3 499.5 499.5 499.7 0.2 1 Feet above mouth 2 Feet above confluence with Elm Fork Trinity River 3 Elevation computed without consideration of flooding from Elm Fork Trinity River 4 Feet above confluence with Grapevine Creek FEET (NGVD) INCREASE TABLE 8 FEDERAL EMERGENCY MANAGEMENT AGENCY DALLAS COUNTY, TX AND INCORPORATED AREAS FLOODWAY DATA GLENN BRANCH GRAPEVINE CREEK TRIBUTARY G-1 OF GRAPEVINE CREEK

442 BETHEL SCHOOL ROAD CARTER 467 DRIVE MOORE ROAD 465 SWAN DRIVE 462 461 460 %, D MOCKINGBIRD LANE BLUE PELICAN JAY CRANE LANE MALLARD DRIVE DRIVE LANE MACARTHUR BOULEVARD CITY OF COPPELL 480170 Legend 1% annual chance (100-Year) Floodplain 1% annual chance (100-Year) Floodway 0.2% annual chance (500-Year) Floodplain 469 471 466 464 463 ZONE AE RM601 458 D 458 D 457 RM198 ST. LOUIS - SAN FRANCISCO RAILROAD BELTLINE ROAD %, C 451 APPROXIMATE SCALE IN FEET 1000 500 0 1000 FEET 455 ZONE A REVISED AREA 454 ZONE AE 452 451 450 449 %, B 449 446 Grapevine Creek 448 446 AREA REVISED BY LOMR EFFECTIVE SEPTEMBER 19, 2007 LEVEE 446 444 NATIONAL FLOOD INSURANCE PROGRAM FIRM FLOOD INSURANCE RATE MAP DALLAS COUNTY, TEXAS AND INCORPORATED AREAS PANEL 155 OF 725 (SEE MAP INDEX FOR PANELS NOT PRINTED) CONTAINS: COMMUNITY NUMBER PANEL SUFFIX CITY OF DALLAS 480171 ZONE A NORTH LAKE CITY OF DALLAS CITY OF IRVING CITY OF IRVING 480180 RANCHVIEW COWBOYS PARKWAY WARNING! THIS AREA IS SHOWN AS BEING PROTECTED FROM THE 1- PERCENT-ANNUAL-CHANCE FLOOD HAZARD BY LEVEE, DIKE, OR OTHER STRUCTURE OVERTOPPING OR FAILURE OF THIS STRUCTURE IS POSSIBLE, WHICH COULD RESULT IN DESTRUCTIVE FLOOD ELEVATIONS AND HIGH VELOCITY FLOODWATERS. THERE IS A CHANCE THAT LARGE FLOODS WILL OCCUR THAT ARE GREATER THAN THE LEVEL OF PROTECTION PROVIDED BY THE LEVEE. COMMUNITIES SHOULD ISSUE EVACUATION PLANS AND ENCOURAGE PROPERTY OWNERS BEHIND THESE STRUCTURES TO PURCHASE FLOOD INSURANCE EVEN IF THE STRUCTURE IS CURRENTLY SHOWN AS PROVIDING PROTECTION FOR THE 1-PERCENT- ANNUAL-CHANCE-FLOOD. CARROLLTON, CITY OF COPPELL, CITY OF DALLAS, CITY OF IRVING, CITY OF 480167 480170 480171 480180 REVISED TO REFLECT LOMR EFFECTIVE: 0155 0155 0155 0155 MAP NUMBER 48113C0155 J EFFECTIVE DATE: AUGUST 23, 2001 J J J J VALLEY RANCH WEST