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Home My WebLink About20221000.tiffFederal Emergency Management Agency Washington, D.C. 20472 March 21, 2022 CERTIFIED MAIL RETURN RECEIPT REQUESTED The Honorable Scott James Chairman, Weld County Board of Commissioners P. O. Box 758 Greeley, CO 80631 Dear Mr. James: IN REPLY REFER TO: Case No.: 21-08-1071R Community Name: Weld County, CO Community No.: 080266 104 RECEIVED MAR 2 2 2022 WELD COUNTY COMMISSIONERS 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 (FIS) report and Flood Insurance Rate Map (FIRM) 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, at (303) 235-4830, or the FEMA Mapping and Insurance eXchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP). Additional information about the NFIP is available on our website at https://www.fema.gov/flood-insurance. Sincerely, Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration Enclosure: Conditional Letter of Map Revision Comment Document cc: The Honorable Matthew Fries Mayor, Town of Severance The Honorable Paul Rennemeyer Mayor, Town of Windsor Mr. Tom Parko Planning Director Weld County Mr. Jack Holler Windsor LV LLC & Windsor LV II LLC COMMun ; Gaf:on S 4/4/2.2 - cc: ofMCRR),PL(Tp/DR), PW ONER/c H/OD) 3 /29 /2.2. Ms. Terri Fead, P.E., CFM Floodplain Mapping Coordinator Colorado Water Conservation Board Ms. Marta Blanco Castano, GISP, CFM Flood Mapping Program Assistant Colorado Water Conservation Board Mr. Kevin Houck, P.E., CFM Chief, Watershed and Flood Protection Section Colorado Water Conservation Board 2022-1000 Page 1 of 7 tissue Date: March 21, 2022 'Case No.: 21-08-1071R I CLOMR-APP Management Agency D.C. 20472 Otie�E 4 i.r ° Federal Emergency °3- �` Washington, '41ND SEGJ CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT COMMUNITY INFORMATION PROPOSED PROJECT DESCRIPTION BASIS OF CONDITIONAL REQUEST COMMUNITY Weld County Colorado (Unincorporated Areas) EXCAVATION FILL GRADING DROP STRUCTURE CULVERT CHANNEL RELOCATION CHANNEL STABILIZATION 1D HYDRAULIC ANALYSIS UPDATED TOPOGRAPHIC DATA COMMUNITY NO.: 080266 IDENTIFIER 016-2250 Severance South Subdivision APPROXIMATE LATITUDE & LONGITUDE: 40.483, -104.869 SOURCE: USGS QUADRANGLE DATUM: NAD 83 AFFECTED MAP PANELS TYPE: FIRM' NO.: 0812301501E DATE: January 20, 2016 *FIRM - Flood Insurance Rate Map FLOODING SOURCES AND REACH DESCRIPTION See Page 2 for Additional Flooding Sources Greeley Canal No. 2 — from State Highway 392 to the divergence from John Law Ditch PROPOSED PROJECT DESCRIPTION Flooding Source Proposed Project Location of Proposed Project Greeley Canal No. 2 Fill Placement, Excavation, and Grading Along the left overbank from State Highway 392 to the divergence from John Law Ditch SUMMARY OF IMPACTS TO FLOOD HAZARD DATA Flooding Source Effective Flooding Proposed Flooding Increases Decreases John Law Ditch Zone AE Zone AE 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 Mapping and Insurance eXchange (FMIX) 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 the FEMA website at https://www.fema.gov/flood-insurance. "14/ Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 21-08-1071R 104 Page 2 of 7 Ilssue Date: March 21, 2022 (Case No.: 21-08-1071R I CLOMR-APP Federal Emergency Management Agency O� Washington, D.C. 20472 Fl.1 S�CJ CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) COMMUNITY INFORMATION (CONTINUED) ADDITIONAL FLOODING SOURCES AFFECTED BY THIS CONDITIONAL REQUEST FLOODING SOURCES AND REACH DESCRIPTION CR21 Overtopping Flow — from the confluence with John Law Ditch to County Road 21 PROPOSED PROJECT DESCRIPTION Flooding Source Proposed Project Location of Proposed Project CR21 Overtopping Flow Excavation and Grading From just upstream from the confluence with John Law Ditch to just downstream of County Road 21 SUMMARY OF IMPACTS TO FLOOD HAZARD DATA Flooding Source Effective Flooding Proposed Flooding Increases Decreases CR21 Overtopping Flow Zone AE Zone AE None Yes BFEs* BFEs None Yes Zone AH Zone AE None None Zone AN Zone X (shaded) None Yes * BFEs - Base (1 -percent -annual -chance) Flood Elevations This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange (FMIX) 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 the FEMA website at https://www.fema.gov/flood-insurance. -14i Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 21-08-1071R 104 Page 3 of 7 Ilssue Date: March 21, 2022 (Case No.: 21-08-1071R I CLOMR-APP O�'QA�\E cv °O.' Federal Emergency Management Agency °- 4 Washington, D.C. 20472 ! GJ, qND 5t..: CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) OTHER COMMUNITIES AFFECTED BY THIS CONDITIONAL REQUEST CID Number: 080317 Name: Town of Severance, Colorado AFFECTED MAP PANELS TYPE: FIRM NO.: 08123C1501E DATE: January 20, 2016 CID Number: 080264 Name: Town of Windsor, Colorado AFFECTED MAP PANELS TYPE: FIRM NO.: 08123C1501E DATE: January 20, 2016 This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange (FMIX) 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 the FEMA website at https://www.fema.gov/flood-insurance. Alf Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 21-08-1071R 104 Page 4 of 7 Ilssue Date: March 21, 2022 (Case No.: 21-08-1071R I CLOMR-APP Federal Emergency Management Agency Washington, D.C. 20472 ,si&je.:, 0WA:: 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: Greeley Canal No. 2 BFE Change (feet) Location of maximum change Existing vs. Effective Maximum increase 0.4 Approxinately 140 feet downstream of the divergence from John Law Ditch Maximum decrease 0.6 Approximately 780 feet downstream of the divergence from John Law Ditch Proposed vs. Existing Maximum increase 1.5 Approximately 290 feet downstream of the divergence from John Law Ditch Maximum decrease None Not Applicable Proposed vs. Effective Maximum increase 1.7 Approximately 290 feet downstream of the divergence from John Law Ditch Maximum decrease 0.5 Approximately 1,020 feet upstream of State Highway 392 Flooding Source: CR21 Overtopping Flow BFE Change (feet) Location of maximum change Existing vs. Effective Maximum increase None Not Applicable Maximum decrease None Not Applicable Proposed vs. Existing Maximum increase 0.4 Approximately 60 feet downstream from County Road 21 Maximum decrease 0.6 Approximately 310 feet upstream from the confluence with John Law Ditch Proposed vs. Effective Maximum increase None Not Applicable Maximum decrease None Not Applicable Increases due to the proposed project that exceed those permitted under Paragraphs (c)(10) or (d)(3) of Section 60.3 of the NFIP regulations must adhere to Section 65.12 of the NFIP regulations. With this request, your community has complied with all requirements of Paragraph 65.12(a) of the NFIP regulations. Compliance with Paragraph 65.12(b) also is necessary before FEMA can issue a Letter of Map Revision when a community proposes to permit encroachments into the effective floodplain that will cause BFE increases in excess of those permitted under Paragraph 60.3(c)(10). 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. This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange (FMIX) 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 the FEMA website at https://www.fema.goviflood-insurance. .-141 Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 21-08-1071R 104 Page 5 of 7 Ilssue Date: March 21, 2022 (Case No.: 21-08-1071R I CLOMR-APP �E OtiY% 47 Federal Emergency Management Agency °�tl 4 Washington, D.C. 20472 -41ND SSGJ:. 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 and FIS report. If the project is built as proposed and the data below are received, a revision to the FIRM and FIS report would be warranted. • 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 1, entitled "Overview and Concurrence Form," must be included. A copy of this form may be accessed at https://www.fema.gov/flood-maps/change-your-flood-zone/paper-application-forms/mt-2. • The detailed application and certification forms listed below may be required if as -built conditions differ from the proposed plans. If required, please submit new forms, which may be accessed at https://www.fema.gov/flood-maps/change-your-flood-zone/paper- application-forms/mt-2, or annotated copies of the previously submitted forms showing the revised information. Form 2, entitled "Riverine Hydrology and Hydraulics Form." Hydraulic analyses for as -built conditions of the base flood must be submitted with Form 2. Form 3, entitled "Riverine Structures Form." • A certified topographic work map showing the revised and effective base floodplain 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 FIRM, at the scale of the effective FIRM, that shows the revised base floodplain boundary delineations shown on the submitted work map and how they tie-in to the base floodplain 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. • Documentation of the individual legal notices sent to property owners who will be affected by any widening or shifting of the base floodplain and/or any BFE increases along Greeley Canal No. 2 and CR21 Overtopping Flow. This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange (FMIX) 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 the FEMA website at https://www.fema.gov/flood-insurance. .41/ Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 21-08-1071R 104 Page 6 of 7 Ilssue Date: March 21, 2022 'Case No.: 21-08-1071R I CLOMR-APP Federal Emergency Management Agency Washington, D.C. 20472 otieAARY`� °' %0. F1•INDSSC CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) COMMUNITY INFORMATION (CONTINUED) DATA REQUIRED FOR FOLLOW-UP LOMR (continued) • FEMA's fee schedule for reviewing and processing requests for conditional and final modifications to published flood information and maps may be accessed at https://www.fema.gov/flood-maps/change-your-flood-zone/status/flood-map-related-fees. 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 either forward the payment, along with the revision application, to the following address: Colorado Water Conservation Board 1313 Sherman Street, Room 718 Denver, CO 80203 or submit the LOMR using the Online LOMC portal at: https://hazards.fema.gov/femaportal/onlinelomc/signin After receiving appropriate documentation to show that the project has been completed, FEMA will initiate a revision to the FIRM 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 Mapping and Insurance eXchange (FMIX) 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 the FEMA website at https://www.fema.gov/flood-insurance. -4/ Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 21-08-1071R 104 Page 7 of 7 'Issue Date: March 21, 2022 'Case No.: 21-08-1071R I CLOMR-APP 90.0,117'44 Federal Emergency Management Agency , Washington, D.C. 20472 4NA SVGS CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) COMMUNITY INFORMATION (CONTINUED) COMMUNITY REMINDERS 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 P. 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 Although a portion of the proposed area of revision is shown on the effective FIRM as located within Weld County, most of this area has been annexed by the Town of Severance. This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange (FMIX) 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 the FEMA website at https://www.fema.gov/flood-insurance. 'Al Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 21-08-1071R 104 Hello