Page 1 of 4 Issue Date: September 24, 2008 Effective Date: September 29, 2008 Case No.: 08-09-1757P LOMR-APP Washington, D.C. 20472 Federal Emergency Management Agency LETTER OF MAP REVISION DETERMINATION DOCUMENT COMMUNITY AND REVISION INFORMATION PROJECT DESCRIPTION COMMUNITY APPROXIMATE LATITUDE & LONGITUDE: 34.412, -118.419 SOURCE: Other DATUM: NAD 83 City of Santa Clarita Los Angeles County California COMMUNITY NO.: 060729 BASIS OF REQUEST IDENTIFIER NO PROJECT MAP UPDATE FLOOD INSURANCE STUDY REPORT UPDATE Sand Canyon Creek Reissuance LOMR ANNOTATED MAPPING ENCLOSURES ANNOTATED STUDY ENCLOSURES TYPE: FIRM* NO.: 06037C0845 F DATE: September 26, 2008 DATE OF EFFECTIVE FLOOD INSURANCE STUDY REPORT: September 26, 2008 PROFILE(S): 165P Enclosures reflect changes to flooding sources affected by this revision. * FIRM - Flood Insurance Rate Map; ** FBFM - Flood Boundary and Floodway Map; *** FHBM - Flood Hazard Boundary Map FLOODING SOURCE(S) & REVISED REACH(ES) Sand Canyon Lateral - from approximately 450 feet downstream of Robinson Ranch Road to approximately 1,350 feet upstream SUMMARY OF REVISIONS This Letter of Map Revision (LOMR) is an update to FIRM Panel No. 06037C0845 F and Profile Panel 165P, of the Flood Insurance Study (FIS) report for Los Angeles County and its incorporated areas, scheduled to become effective on September 26, 2008. The new FIRM and FIS report incorporated a LOMR effective May 15, 2000 (Case No. 00-09-025P), which revised the Special Flood Hazard Areas (SFHAs), the areas that would be inundated by the base (1-percent-annual-chance) flood, using the previously effective National Geodetic Vertical Datum of 1929. Flood elevations on the September 26 FIRM are referenced to the North American Vertical Datum of 1988. This LOMR updates FIRM Panel No. 06037C0845 F and Profile Panel 165P to reflect the appropriate vertical datum, therefore superseding the September 26 FIRM Panel and affected portions of the FIS report for the revision area. This LOMR does not revise the SFHA boundaries or Base Flood Elevations from the May 15 LOMR along the revised reach. 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 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 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 panels 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 Assistance Center toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMR Depot, 3601 Eisenhower Avenue, Alexandria, VA 22304. Additional Information about the NFIP is available on our website at http://www.fema.gov/nfip. 112553 10.3.1.08091757 102-I-A-C Craig S. Kennedy, CFM, Program Specialist Engineering Management Branch Mitigation Directorate Page 2 of 4 Issue Date: September 24, 2008 Effective Date: September 29, 2008 Case No.: 08-09-1757P LOMR-APP Washington, D.C. 20472 Federal Emergency Management Agency 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 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 Your community must regulate all proposed floodplain development and ensure that permits required by Federal and/or State law have been obtained. State 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 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. 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 Assistance Center toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMR Depot, 3601 Eisenhower Avenue, Alexandria, VA 22304. Additional Information about the NFIP is available on our website at http://www.fema.gov/nfip. 112553 10.3.1.08091757 102-I-A-C Craig S. Kennedy, CFM, Program Specialist Engineering Management Branch Mitigation Directorate Page 3 of 4 Issue Date: September 24, 2008 Effective Date: September 29, 2008 Case No.: 08-09-1757P LOMR-APP Washington, D.C. 20472 Federal Emergency Management Agency 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. Sally M. Ziolkowski Director, Mitigation Division Federal Emergency Management Agency, Region IX 1111 Broadway Street, Suite 1200 Oakland, CA 94607-4052 (510) 627-7175 STATUS OF THE COMMUNITY NFIP MAPS We are processing a FIRM and FIS report in countywide format for Los Angeles County, California and Incorporated Areas. The countywide FIRM and FIS report, which include flood hazard information for your community, will become effective on September 26, 2008. Because the effective date has already been established, we will not incorporate the modifications made by this LOMR into the countywide FIRM and FIS report before it becomes effective. However, the modifications made by this LOMR will supersede the new countywide FIRM and FIS report after they become effective. The name of the affected flooding source has been changed from Sand Canyon Creek to Sand Canyon Lateral to be consistent with the Summary of Discharges Table 7 and the previously effective FIRM and FIS report. 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 Assistance Center toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMR Depot, 3601 Eisenhower Avenue, Alexandria, VA 22304. Additional Information about the NFIP is available on our website at http://www.fema.gov/nfip. 112553 10.3.1.08091757 102-I-A-C Craig S. Kennedy, CFM, Program Specialist Engineering Management Branch Mitigation Directorate Page 4 of 4 Issue Date: September 24, 2008 Effective Date: September 29, 2008 Case No.: 08-09-1757P LOMR-APP Washington, D.C. 20472 Federal Emergency Management Agency LETTER OF MAP REVISION DETERMINATION DOCUMENT (CONTINUED) PUBLIC NOTIFICATION OF REVISION This revision will become effective on September 29, 2008. Any requests to review or alter this determination should be made within 30 days and must be based on scientific or technical data. 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 Assistance Center toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMR Depot, 3601 Eisenhower Avenue, Alexandria, VA 22304. Additional Information about the NFIP is available on our website at http://www.fema.gov/nfip. 112553 10.3.1.08091757 102-I-A-C Craig S. Kennedy, CFM, Program Specialist Engineering Management Branch Mitigation Directorate 1586 1586 1589 1589 1591 1591 1595 1595 1597 1597 1601 1601 1606 1606 1612 1612 LIMIT OF DETAILED STUDY LIMIT OF DETAILED STUDY REVISED AREA REVISED AREA ZONE A ZONE A ZONE A ZONE AO ZONE AE ZONE AE LIMIT OF DETAILED STUDY LIMIT OF DETAILED STUDY (DEPTH 1') ZONE AO (DEPTH 1') ZONE AO (DEPTH 2') LOS ANGELES COUNTY UNINCORPORATED AREAS 065043 LOS ANGELES COUNTY UNINCORPORATED AREAS 065043 ZONE D CITY OF SANTA CLARITA 060729 CITY OF SANTA CLARITA 060729 SAND CANYON LATERAL SAND CANYON LATERAL ZONE X ZONE X ZONE AO (DEPTH 3') ZONE AO ZONE AO (DEPTH 3') ZONE A CONDOR RIDGE RD FALCONRIM DR FALCONRIM DR CIRCLE G RD CIRCLE G RD ZONE D ZONE D ZONE D SAND CANYON CREEK SAND CANYON CREEK ZONE A ZONE A ZONE D Legend 1% annual chance (100-Year) Floodway 1% annual chance (100-Year) Floodplain 0.2% annual chance (500-Year) Floodplain MAP SCALE 1" = 1000' NATIONAL FLOOD INSURANCE PROGRAM NFIP Federal Emergency Management Agency Notice to User: The shown below should be used when placing map orders; the shown above should be used on insurance applications for the subject community. Community Number Map Number FIRM FLOOD INSURANCE RATE MAP PANE L 0845 F CONTAINS: COMMUNITY NUMBER PANEL SUFFIX MAP NUMBER 06037C0845F SE PTEMBER 26, 2008 PANEL 845 OF 2350 (SEE MAP INDEX FOR FIRM PANEL LAYO UT) LOS ANGELES COUNTY, CALIFORNIA LOS ANGELES COUNTY 065043 0845 F AND INCOR POR ATED AREAS EFFECTIVE DATE: SANTA CLARITA, CITY OF 060729 0845 F 500 250 0 500 1,000 1,500 2,000 Feet 300 150 0 300 600 Meters