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Home My WebLink AboutFDP201700006 Letter of Map Revision 2018-02-01Federal Emergency Management Agency Washington, D.C. 20472 February 1, 2019 CERTIFIED MAIL IN REPLY REFER TO: RETURN RECEIPT REQUESTED Case No.: 17-03-1753R Community Name: Albemarle County, VA Mr. Jeff Richardson Community No.: 510006 Albemarle County Executive 401 McIntire Road Charlottesville, VA 22902 Dear Mr. Richardson: 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 and Flood Insurance Rate 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 Philadelphia, Pennsylvania, at (215) 931-55I2, or the FEMA Map Information eXchange (FMIX) toll free at I-877-336-2627 (1-877-FEMA MAP). Additional information about the NFIP is available on our website at littps: /www.fema.aov!national-.flood-insuratice-nrogram. Sincerely, Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration List of Enclosures: Conditional Letter of Map Revision Comment Document cc: Mr. Frank V. Pohl, P.E., CFM Floodplain Administrator/County Engineer Albemarle County Mr. Charlie Armstrong Vice President Southern Development Homes Mr. Michael F. Myers, P.E., CFM President Dominion Engineering and Design, LLC Page 1 of 5 Issue Date: February 1, 2018 Case No.: 17-03-1753R CLOMR-APP Federal Emergency Management Agency . �� Washington, D.C. 20472 tom; GiS:• CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT COMMUNiTY INFORMATION PROPOSED PROJECT DESCRIPTION BASIS OF CONDITIONAL REQUEST Albemarle County CULVERT BASE MAP CHANGES Virginia FILL FLOODWAY (Unincorporated Areas) HYDRAULIC ANALYSIS UPDATED TOPOGRAPHIC DATA COMMUNtTY COMMUNITY NO.: 510006 West Glen Subdivision APPROXIMATE LATITUDE AND LONGITUDE: 38.077,-78.713 IDENTIFIER SOURCE: Precision Mapping Streets DATUM: NAD 83 AFFECTED MAP PANEL TYPE: FIRM' NO.: 51003CO229D DATE: Feburary 4, 2005 ' FIRM - Flood Insurance Rate Map FLOODING SOURCE AND REACH DESCRIPTION Powells Creek — from approximately 50 feet upstream of Jarmans Gap Road to approximately 580 feet upstream of Cling Lane. PROPOSED PROJECT DESCRIPTION Flooding Source Proposed Project Location of Proposed Project Powells Creek 2 - New 8'X8' Box Culvert and Fill Approximately 1,896 feet downstream of Cling Lane. SUMMARY OF IMPACTS TO FLOOD HAZARD DATA Flooding Source Effective Flooding Proposed Flooding Increases Decreases Powells Creek Floodway Floodway Yes Yes BFEs' BFEs Yes Yes Zone AE Zone AE Yes Yes Zone X (shaded) Zone X (shaded) 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 Stale/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, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional Information about the NFIP is available on the FEMA website at https:Rwww.fema.gov/national-flood-insurance-program. Patrick 'Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 17-03-1753R 104 Page 2 of 5 Issue Date: February 1, 2018 Case No.: 17-03-1753R CLOMR-APP Federal Emergency Management Agency Y 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: Powells Creek BFE Change (feet) Location of maximum change Existing vs. Maximum increase 2.9 Just upstream of Cling Lane. Maximum decrease 2.6 Approximately 870 feet downstream of Cling Lane. Effective Proposed vs. Maximum increase 2.5 Approximately 1,880 feet downstream of Cling Lane. Maximum decrease 0.1 Approximately 40 feet downstream of Cling Lane. Existing Proposed vs. Maximum increase 3.0 Just upstream of Cling Lane. IMaximum decrease 2.6 Approximately 900 feet upstream of Jarmans Gap Road. Effective Increases due to the proposed project that exceed those permitted under Paragraphs (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 and regulatory floodway that will cause BFE increases in excess of those permitted under Paragraph 60.3(d)(3). 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 Map Information 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 hUps://www.fema.gov/ni�aattii�onal-flood-insurance-program. Patrick 'Rick' F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 17-03-1753R 104 Page 3 of 5 Issue Date: February 1, 2018 Case No.: 17.03-1753R CLOMR-APP I Federal Emergency Management Agency of 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 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 fast be used for requesting final revisions to the maps. Therefore, when the map revision request for the area covered by this letter is submitted, Fonn 1, entitled "Overview and Concurrence Form," must be included. A copy of this form may be accessed at littp,,://www.fema.gov/media-library/assets/documents/1343. • 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://wivw.fema.gov/media-library/assets/documents/1343, or annotated copies of the previously submitted fortns showing the revised information. • Form 2, entitled "Riverine Hydrology and Hydraulics Form." Hydraulic analyses for as -built conditions of the base flood, 10-percent, 2- percent, 0.2-percent-annual-chance floods, and the regulatory floodway must be submitted with Form 2. • Form 3, entitled "Riverine Structures Form." • A certified topographic work snap showing the revised and effective base, 0.2-percent-annual-chance 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 and any tributaries. • An annotated copy of the FIRM, at the scale of the effective FIRM, that shows the revised base, 0.2-percent-annual-chance floodplain, and floodway boundary delineations shown on the submitted work map and how they tie-in to the base, 0.2-percent-annual-chance floodplain, and floodway boundary delineations shown on the current effective FIRM at the downstream and upstream ends of the revised reach, as well as any tributaries. • As -built plans, certified by a registered Professional Engineer, of all proposed project elements. • 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 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 Powells Creek. This comment is based on the Flood data presently available. It you have any questions about this document, please contact the FEMA Map Information eXchange (FMIX) toll free at 1.877-338-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304. Additional Information about the NFIP is available on the FEMA websittee at h`taps:llwww.fema.govinnaat�io�nal-flood-insurance-program. Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 17-03-1753R 104 Page 4 of 5. Issue Date: February 1, 2018 Case No.: 17-03-1753R 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 (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/forms-documents-and-sotlware/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: LOMC Clearinghouse Attention: LOMR Manager 3601 Eisenhower Avenue, Suite 500 Alexandria, Virginia 22304-6426 or submit the LOMR and fee using the Online LOMC portal at: https:/fhazards.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 Map Information 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:llwww,fema.govinational-flood-insurance-program. Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 17-03-1753R 104 Page 5 of 5 Issue Date: February 1, 2018 Case No.: 17-03-1753R CLOMR-APP pARTA9`♦a. 6y '� "^ Federal Emergency Management Agency Washington, D.C. 20472 ��t tNI3 �L��1"rJ 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 he the primary liaison between your community and FEMA. For information regarding your CCO, please contact: Mr. Eugene K. Gruber Director, Mitigation Division Federal Emergency Management Agency, Region I II One Independence Mall, Sixth Floor 615 Chestnut Street Philadelphia, PA 19106 4404 (215) 9315512 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, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426, Additional Information about the NFIP is available on the FEMA websile at https://www,fema.gov/national-flood-insurance-program. Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 17-03-1753R 104