Federal Emergency Management Agency Washington, D.C

Page 1 of 6 Issue Date: July 31, 2019 Effective Date: December 16, 2019 Case No.: 19-06-0044P 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 Lafayette Parish CHANNEL RELOCATION BASE MAP CHANGES Louisiana CULVERT HYDRAULIC ANALYSIS (Unincorporated Areas) HYDROLOGIC ANALYSIS UPDATED TOPOGRAPHIC DATA COMMUNITY

COMMUNITY NO.: 220101

IDENTIFIER Chateau Mirage APPROXIMATE LATITUDE AND LONGITUDE: 30.175, -92.085 SOURCE: USGS QUADRANGLE DATUM: NAD 83

ANNOTATED MAPPING ENCLOSURES ANNOTATED STUDY ENCLOSURES

TYPE: FIRM* NO.: 22055C0165J DATE: December 21, 2018 DATE OF EFFECTIVE FLOOD INSURANCE STUDY: December 21, 2018 PROFILES: 94P, 95P AND 96P SUMMARY OF DISCHARGES TABLE: 4

Enclosures reflect changes to flooding sources affected by this revision. * FIRM - Flood Insurance Rate Map

FLOODING SOURCES AND REVISED REACHES See Page 2 for Additional Flooding Sources Coulee Ile des Cannes Lateral 2A - from the confluence with Coulee Ile des Cannes Lateral 2 to approximately 1,980 feet upstream of the confluence with Coulee Ile des Cannes Lateral 2 Coulee Ile des Cannes Lateral 2A East - from approximately 1,530 feet downstream of Town Center Parkway to approximately 440 feet upstream of Town Center Parkway

SUMMARY OF REVISIONS Flooding Source Effective Flooding Revised Flooding Increases Decreases Coulee Ile des Cannes Lateral 2A Zone A Zone AE YES YES Zone X (shaded) Zone X (shaded) YES YES No BFEs* BFEs YES NONE Coulee Ile des Cannes Lateral 2A East Zone A Zone AE 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 panel 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 toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional Information about the NFIP is available on our website at https://www.fema.gov/national-flood-insurance-program.

Patrick “Rick” F. Sacbibit, P.E., Branch Chief Engineering and Services Branch Federal Insurance and Mitigation Administration 19-06-0044P 102-I-A-C Page 2 of 6 Issue Date: July 31, 2019 Effective Date: December 16, 2019 Case No.: 19-06-0044P LOMR-APP

Federal Emergency Management Agency Washington, D.C. 20472

LETTER OF MAP REVISION DETERMINATION DOCUMENT (CONTINUED)

OTHER FLOODING SOURCES AFFECTED BY THIS REVISION

FLOODING SOURCES AND REVISED REACHES Coulee Ile des Cannes Lateral 2A East - from approximately 1,530 feet downstream of Town Center Parkway to approximately 440 feet upstream of Town Center Parkway Coulee Ile des Cannes Lateral 2A West - from approximately 1,690 feet downstream of Town Center Parkway to approximately 250 feet upstream of Town Center Parkway

SUMMARY OF REVISIONS Flooding Source Effective Flooding Revised Flooding Increases Decreases Coulee Ile des Cannes Lateral 2A East No BFEs BFEs YES NONE Zone X (shaded) Zone X (shaded) YES YES Coulee Ile des Cannes Lateral 2A West Zone A Zone AE YES YES No BFEs BFEs YES NONE Zone X (shaded) Zone X (shaded) YES YES

Patrick “Rick” F. Sacbibit, P.E., Branch Chief Engineering and Services Branch Federal Insurance and Mitigation Administration 19-06-0044P 102-I-A-C Page 3 of 6 Issue Date: July 31, 2019 Effective Date: December 16, 2019 Case No.: 19-06-0044P 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: 220105 Name: City of Lafayette, Louisiana

AFFECTED MAP PANELS AFFECTED PORTIONS OF THE FLOOD INSURANCE STUDY REPORT

TYPE: FIRM NO.: 22055C0165J DATE: December 21, 2018 DATE OF EFFECTIVE FLOOD INSURANCE STUDY: December 21, 2018 SUMMARY OF DISCHARGES TABLE: 4

Patrick “Rick” F. Sacbibit, P.E., Branch Chief Engineering and Services Branch Federal Insurance and Mitigation Administration 19-06-0044P 102-I-A-C Page 4 of 6 Issue Date: July 31, 2019 Effective Date: December 16, 2019 Case No.: 19-06-0044P 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.

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 discharges computed in the submitted hydrologic model. Future development of projects upstream could cause increased discharges, which could cause increased flood hazards. A comprehensive restudy of your community’s flood hazards would consider the cumulative effects of development on discharges and could, therefore, indicate that greater flood hazards exist 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.

Patrick “Rick” F. Sacbibit, P.E., Branch Chief Engineering and Services Branch Federal Insurance and Mitigation Administration 19-06-0044P 102-I-A-C Page 5 of 6 Issue Date: July 31, 2019 Effective Date: December 16, 2019 Case No.: 19-06-0044P LOMR-APP

Federal Emergency Management Agency Washington, D.C. 20472

LETTER OF MAP REVISION 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:

Ms. Sandy Keefe Director, Mitigation Division Federal Emergency Management Agency, Region VI Federal Regional Center, Room 202 800 North Loop 288 Denton, TX 76209 (940) 898-5127

STATUS OF THE COMMUNITY NFIP MAPS We will not physically revise and republish the FIRM and FIS report for your community to reflect the modifications made by this LOMR at this time. When changes to the previously cited FIRM panel and FIS report warrant physical revision and republication in the future, we will incorporate the modifications made by this LOMR at that time.

Patrick “Rick” F. Sacbibit, P.E., Branch Chief Engineering and Services Branch Federal Insurance and Mitigation Administration 19-06-0044P 102-I-A-C Page 6 of 6 Issue Date: July 31, 2019 Effective Date: December 16, 2019 Case No.: 19-06-0044P LOMR-APP

Federal Emergency Management Agency Washington, D.C. 20472

LETTER OF MAP REVISION 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 website at https://www.floodmaps.fema.gov/fhm/bfe_status/bfe_main.asp.

LOCAL NEWSPAPER Name: The Daily Advertiser Dates: August 9, 2019 and August 16, 2019

Within 90 days of the second publication in the local newspaper, any interested party 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 presented in this LOMR may be changed.

Patrick “Rick” F. Sacbibit, P.E., Branch Chief Engineering and Services Branch Federal Insurance and Mitigation Administration 19-06-0044P 102-I-A-C TABLE 4 – SUMMARY OF DISCHARGES (continued) Peak Discharges (cfs) Drainage 10-Percent 2-Percent 1-Percent 0.2-Percent Flooding Source and Location Area Annual Annual Annual Annual (sq.mi) Chance Chance Chance Chance Coulee lle Des Cannes Lateral 2A Just upstream of the confluence with Coulee Ile Des Cannes Lateral 2 0.12 * * 165 203

Coulee lle Des Cannes Lateral 2A East At approximately 1,530 feet downstream of Town Center Parkway 0.06 * * 50 54

Coulee lle Des Cannes Lateral 2A West At approximately 1,690 feet downstream of Town Center Parkway 0.17 * * 108 128

* Data not computed

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