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Home My WebLink About20132983.tiffFederal Emergency Management Agency Washington, D.C. 20472 October 17, 2013 CERTIFIED MAIL RETURN RECEIPT REQUESTED The Honorable William Garcia Chairman, Weld County Board of Commissioners P. O. Box 758 Greeley, CO 80632 Dear Mr. Garcia: IN REPLY REFER Case No.: Community Name: Community No.: TO: 13-08-0704R Weld County, CO 080266 We are providing our comments with the enclosed Conditional Letter of Map Revision (CLOMR) on a proposed project within your community that, if constructed as proposed, could revise the effective Flood Insurance Study report, Flood Insurance Rate Map, Flood Boundary and Floodway Map for your community. If you have any questions regarding the floodplain management regulations for your community, the National Flood Insurance Program (NFIP) in general, or technical questions regarding this CLOMR, please contact the Director, Mitigation Division of the Federal Emergency Management Agency (FEMA) Regional Office in Denver, Colorado, at (303) 235-4830, or the FEMA Map Information eXchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP). Additional information about the NFIP is available on our website at http://www.fema.gov/nfip. Luis Rodriguez, P.E., Chief Engineering Management Branch Federal Insurance and Mitigation Administration List of Enclosures: Conditional Letter of Map Revision Comment Document cc: Mr. Clay Kimmi, P.E., CFM Senior Engineer Weld County Public Works Depot went Wayne Howard, P.E. County Engineer Weld County Public Works Depot fluent Mr. Josh Hollon, P.E. Project Manager Atkins ewut,K.;ca "bens /0/O11 RECEIVED OCT 2 1 2mig WELD COUNTY COMMISSIONERS Cx).-FL, WM 2013-2983 Page 1 of 5 'issue Date: October 17, 2013 Case No.: 13-08-0704R I CLOMR-APP Federal Emergency ; �, <y r ; ` �., ` Washington, Management Agency D.C. 20472 CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT COMMUNITY INFORMATION PROPOSED PROJECT DESCRIPTION BASIS OF CONDITIONAL REQUEST COMMUNITY Weld County (Unincorporated Areas) Colorado BRIDGE FLOODWAY HYDRAULIC ANALYSIS NEW TOPOGRAPHIC DATA COMMUNITY NO.: 080266 IDENTIFIER Weld County Road 49 Road Extension APPROXIMATE LATITUDE & LONGITUDE: 40.428, -104.603 SOURCE: Precision Mapping Streets 4.0 DATUM: NAD 83 AFFECTED MAP PANELS TYPE: FIRM' NO.: 0637C DATE: September 28, 1982 TYPE: FBFM* NO.: 0006 DATE: September 28, 1990 * FIRM - Flood Insurance Rate Map **FBFM - Flood Boundary and Floodway Map FLOODING SOURCE(S) AND REACH DESCRIPTION Cache La Poudre River — from approximately 3,470 feet to approximately 5,530 feet upstream of the confluence with the South Platte River PROPOSED PROJECT DESCRIPTION Flooding Source Proposed Project Location of Proposed Project Cache La Poudre River New Bridge Approximately 4,260 feet upstream of the confluence with the South Platte River SUMMARY OF IMPACTS TO FLOOD HAZARD DATA Flooding Source Effective Flooding Proposed Flooding Increases Decreases Cache La Poudre River Zone AE Zone AE Yes Yes Floodway Floodway Yes Yes BFEs' BFEs Yes Yes *BFEs - Base (1 -percent -annual -chance) Flood Elevations COMMENT This document provides the Federal Emergency Management Agency's (FEMA's) comment regarding a request for a CLOMR for the project described above. This document is not a final determination; it only provides our comment on the proposed project in relation to the flood hazard information shown on the effective National Flood Insurance Program (NFIP) map. We reviewed the submitted data and the data used to prepare the effective flood hazard information for your community and determined that the proposed project meets the minimum floodplain management criteria of the NFIP. Your community is responsible for approving all floodplain development and for ensuring that all permits required by Federal or State/Commonwealth law have been received. State/Commonwealth, county, and community officials, based on their knowledge of local conditions and in the interest of safety, may set higher standards for construction in the Special Flood Hazard Area (SFHA), the area subject to inundation by the base flood. If the State/Commonwealth, county, or community has adopted more restrictive or comprehensive floodplain management criteria, these criteria take precedence over the minimum NFIP criteria. This comment is based on the flood data presently available. 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 the FEMA website at http://www.fema.gov/nfip. Luis Rodriguez, P.E., Chief Engineering Management Branch Federal Insurance and Mitigation Administration 132942 PT202.BKR.13080704R.H20 104 Page 2 of 5 Ilssue Date: October 17, 2013 'Case No.: 13-08-0704R I CLOMR-APP 4Y ,--%. } Federal Emergency Management Agency Washington, D.C. 20472 CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) COMMUNITY INFORMATION To determine the changes in flood hazards that -will be caused by the proposed project, we compared the hydraulic modeling reflecting the proposed project (referred to as the proposed conditions model) to the hydraulic modeling used to prepare the Flood Insurance Study (FIS) (referred to as the effective model). If the effective model does not provide enough detail to evaluate the effects of the proposed project, an existing conditions model must be developed to provide this detail. This existing conditions model is then compared to the effective model and the proposed conditions model to differentiate the increases or decreases in flood hazards caused by more detailed modeling from the increases or decreases in flood hazards that will be caused by the proposed project. The table below shows the changes in the BFEs: BFE Comparison Table Flooding Source: Cache La Poudre BFE Change (feet) Location of maximum change Existing vs. Effective Maximum increase 0.3 Approximately 5,530 feet upstream of the confluence with the South Platte Rifler Maximum decrease 0.2 Approximately 3,470 feet upstream of the confluence with the South Platte River Proposed vs. Existing Maximum increase None N/A Maximum decrease 0.04 Approximately 4,930 feet upstream of the confluence with the South Platte River Proposed vs. Effective Maximum increase 0.2 Approximately 5,530 feet upstream of the confluence with the South Platte River Maximum decrease 0.2 Approximately 3,470 feet upstream of the confluence with the South Platte River NFIP regulation Subparagraph 60.3(b)( ) requires communitie 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. This comment is based on the flood data presently available. 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 the FEMA website at http://www.fema.govinfip. t „n� ✓r3'... Luis Rodriguez, P.E., Chief Engineering Management Branch Federal Insurance and Mitigation Administration 132942 PT202.BKR.13080704R.H20 104 Page 3 of 5 Ilssue Date: October 17, 2013 Case No.: 13-08-0704R CLOMR-APP Federal Emergency Management Agency Washington, D.C. 20472 CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) COMMUNITY INFORMATION (CONTINUED) DATA REQUIRED FOR FOLLOW-UP LOMR Upon completion of the project, your community must submit the data listed below and request that we make a final determination on revising the effective FIRM, FBFM, and FIS report. If the project is built as proposed and the data below are received, a revision to the FIRM, FBFM, and FIS report would be warranted. • We are processing a revised FIRM and FIS report for the Weld County. Preliminary copies of the revised FIRM and FIS report were submitted to your community for review on May 31, 2013. If a Letter of Map Revision to follow this CLOMR is required before the revised countywide FIRM and FIS report become effective, all models and SFHA and floodway boundary delineations must be modified to tie into the currently effective information. • Form 1, entitled "Overview & Concurrence Form". Detailed application and certification forms must be used for requesting final revisions to the maps. Therefore, when the map revision request for the area covered by this letter is submitted, Form I must be included. If as -built conditions differ from the proposed plans, please submit new forms, which may be accessed at http://www.fema.gov/plan/prevent/fhnl/d1_mt-2.shtm, or annotated copies of the previously submitted forms showing the revised information. • Hydraulic analyses, for as -built conditions, of the base flood; the 10 -percent, 2 -percent, and 0.2 percent annual chance floods; and the regulatory floodway, together with a topographic work map showing the revised floodplain and floodway boundaries. Please ensure that the revised information ties in with the current effective information at the downstream and upstream ends of the revised reach. • An annotated copy of the FIRIvI, at the scale of the effective FIRM, that shows the revised floodplain and floodway boundary delineations shown on the submitted work map and how they tie into the floodplain and floodway boundary delineations shown on the current effective FIRM at the downstream and upstream ends of the revised reach - • As -built plans, certified by a registered professional engineer, of all proposed project elements This comment is based on the flood data presently available. 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 NAP is available on the FEMA website at http://www.fema.gov/nflo. Luis Rodriguez, P.E., Chief Engineering Management Branch Federal Insurance and Mitigation Administration 132942 PT202.BKR.13080704R.H20 104 Page 4 of 5 I Issue Date: October 17, 2013 Case No.: 13-08-0704R CLOMR-APP Federal Emergency Management Agency Washington, D.C. 20472 CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) COMMUNITY INFORMATION (CONTINUED) • A copy of the public notice distributed by your community, stating its intent to revise the regulatory floodway, or a signed statement by your community that it has notified all affected property owners and affected adjacent jurisdictions • Documentation of the notification to property owners who will be affected by any widening/shifting of the base floodplain and/or any BFE increases along the Chache La Poudre River • A letter stating that your community will adopt and enforce the modified regulatory floodway, OR, if the State/Commonwealth has jurisdiction over either the regulatory floodway or its adoption by your community, a copy of your community's letter to the appropriate State/Commonwealth agency notifying it of the modification to the regulatory floodway and a copy of the letter from that agency stating its approval of the modification • FEMA's fee schedule for reviewing and processing requests for conditional and final modifications to published flood information and maps may be accessed at http://www.fema.gov/plan/prevent/flun/fim_fees.shtm. The fee at the time of the map revision submittal must be received before we can begin processing the request. Payment of this fee can be made through a check or money order, made payable in U.S. funds to the National Flood Insurance Program, or by credit card (Visa or MasterCard only). Please forward the payment, along with the revision application, to the following address: LOMC Clearinghouse 847 South Pickett Street Alexandria, VA 22304 After receiving appropriate documentation to show that the project has been completed, FEMA will initiate a revision to the FIRM, FBFM, and FIS report. Because the flood hazard information (i.e., base flood elevations, base flood depths, SFHAs, zone designations, and/or regulatory floodways) will change as a result of the project, a 90 -day appeal period will be initiated for the revision, during which community officials and interested persons may appeal the revised flood hazard information based on scientific or technical data. This comment is based on the flood data presently available. 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 NEP is available on the FEMA website at http://www.fema.gov/nfp. Luis Rodriguez, P.E., Chief Engineering Management Branch Federal Insurance and Mitigation Administration 132942 PT202.BKR.13080704R.H20 104 Page 5 of 5 Issue Date: October 17, 2013 Case No.: 13-08-0704R I CLOMR-APP Federal Emergency Management Agency Washington, D.C. 20472 'a l,l Ntt. Sb t'r CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) COMMUNITY INFORMATION (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. Jeanine D. Petterson Director, Mitigation Division Federal Emergency Management Agency, Region VIII Denver Federal Center, Building 710 P.O. Box 25267 Denver, CO 80225-0267 (303) 235-4830 A preliminary study is being conducted for Weld County. Preliminary copies of the revised FIRM and FIS report were submitted to your community for review on May 31, 2013, and may become effective before the revision request following this CLOMR is submitted. Please ensure that the data submitted for the revision ties into the data effective at the time of the submittal. This comment is based on the flood data presently available. 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 the FEMA website at http://www.fema.gov/nfip. Luis Rodriguez, P.E, Chief Engineering Management Branch Federal Insurance and Mitigation Administration 132942 PT202.BKR.13080704R.H20 104 Hello