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Stanislaus County, California, and Incorporated Areas

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Stanislaus County, California, and Incorporated Areas STANISLAUS COUNTY, CALIFORNIA, AND INCORPORATED AREAS Community Name Community Number CERES, CITY OF 060385 HUGHSON, CITY OF 060386 MODESTO, CITY OF 060387 NEWMAN, CITY OF 060388 OAKDALE, CITY OF 060389 PATTERSON, CITY OF 060390 RIVERBANK, CITY OF 060391 STANISLAUS COUNTY (UNINCORPORATED AREAS) 060384 *TURLOCK, CITY OF 060392 WATERFORD, CITY OF 060393 *Non-Floodprone Community EFFECTIVE DATE: SEPTEMBER 26, 2008 Federal Emergency Management Agency FLOOD INSURANCE STUDY NUMBER 06099CV000A NOTICE TO FLOOD INSURANCE STUDY USERS Communities participating in the National Flood Insurance Program have established repositories of flood hazard data for floodplain management and flood insurance purposes. This Flood Insurance Study (FIS) may not contain all data available within the repository. It is advisable to contact the community repository for any additional data. Selected Flood Insurance Rate Map panels for the community contain information that was previously shown separately on the corresponding Flood Boundary and Floodway Map panels (e.g., floodways, cross-sections). Former flood hazard zone designations have been changed as follows: Old Zone New Zone A1 through A30 AE B X C X Part or all of this FIS may be revised and republished at any time. In addition, part of this FIS may be revised by the Letter of Map Revision process, which does not involve republication or redistribution of the FIS. It is, therefore, the responsibility of the user to consult with community officials and to check the community repository to obtain the most current FIS components. Initial Countywide FIS Effective Date: September 26, 2008 TABLE OF CONTENTS Page 1.0 INTRODUCTION 1 1.1 Purpose of Study 1 1.2 Authority and Acknowledgments 1 1.3 Coordination 3 2.0 AREA STUDIED 4 2.1 Scope of Study 4 2.2 Community Description 5 2.3 Principal Flood Problems 8 2.4 Flood Protection Measures 12 3.0 ENGINEERING METHODS 13 3.1 Hydrologic Analyses 14 3.2 Hydraulic Analyses 19 3.3 Vertical Datum 26 4.0 FLOODPLAIN MANAGEMENT APPLICATIONS 29 4.1 Floodplain Boundaries 29 4.2 Floodways 31 5.0 INSURANCE APPLICATIONS 38 6.0 FLOOD INSURANCE RATE MAP 39 7.0 OTHER STUDIES 40 8.0 LOCATION OF DATA 40 9.0 BIBLIOGRAPHY AND REFERENCES 40 i TABLE OF CONTENTS - continued Page FIGURES Figure 1 – Floodway Schematic 39 TABLES Table 1 – Initial and Final CCO Dates 3-4 Table 2 – Summary of Discharges 18 Table 3 – Manning’s “n” Values 25 Table 4 – Levees Requiring Flood Hazard Revisions 27 Table 5 – Vertical Datum Conversions 28 Table 6 – Floodway Data 32-37 Table 7 – Map History 41-42 EXHIBITS Exhibit 1 - Flood Profiles Del Puerto Creek Panels 01P-03P Dry Creek Panels 04P-06P Orestimba Creek Panels 07P-11P Salado Creek Panels 12P-13P Stanislaus River Panels 14P-24P Tuolumne River at Modesto Panels 25P-31P Tuolumne River at Waterford Panel 32P Exhibit 2 - Flood Insurance Rate Map Index Flood Insurance Rate Map ii FLOOD INSURANCE STUDY STANISLAUS COUNTY, CALIFORNIA, AND INCORPORATED AREAS 1.0 INTRODUCTION 1.1 Purpose of Study This countywide Flood Insurance Study (FIS) investigates the existence and severity of flood hazards in, or revises and updates previous FISs/Flood Insurance Rate Maps (FIRMs) for the geographic area of Stanislaus County, California, including the Cities of Ceres, Hughson, Modesto, Newman, Oakdale, Patterson, Riverbank, Turlock and Waterford, and the unincorporated areas of Stanislaus County (hereinafter referred to collectively as Stanislaus County). The City of Turlock, does not contain any Special Flood Hazard Areas (SFHAs) and is non- flood prone. This FIS aids in the administration of the National Flood Insurance Act of 1968 and the Flood Disaster Protection Act of 1973. This study has developed flood risk data for various areas of the county that will be used to establish actuarial flood insurance rates. This information will also be used by Stanislaus County to update existing floodplain regulations as part of the Regular Phase of the National Flood Insurance Program (NFIP), and by local and regional planners to further promote sound land use and floodplain development. Minimum floodplain management requirements for participation in the NFIP are set forth in the Code of Federal Regulations at 44 CFR, 60.3. In some States or communities, floodplain management criteria or regulations may exist that are more restrictive or comprehensive than the minimum Federal requirements. In such cases, the more restrictive criteria take precedence, and the State (or other jurisdictional agency) will be able to explain them. 1.2 Authority and Acknowledgments The sources of authority for this FIS are the National Flood Insurance Act of 1968 and the Flood Disaster Protection Act of 1973. This FIS was prepared to include all jurisdictions within Stanislaus County into a countywide format FIS. Information on the authority and acknowledgments for each jurisdiction included in this countywide FIS, as compiled from their previously printed FIS reports, is shown below. Modesto, City of The hydrologic and hydraulic analyses for the May 7, 2001 FIS were performed by the U.S. Geological Survey (USGS), for the Federal Insurance Administration (FIA), under Inter-Agency Agreement No. IAA-H-8-76, Project Order No. 7. That study was completed in February 1978. 1 Newman, City of The hydrologic and hydraulic analyses for the initial FIS were prepared by the USGS, for the Federal Emergency Management Agency (FEMA), under Inter- Agency Agreement No. IAA-H-8-76, Project No. 14. That study was published in march 1978. The hydrologic and hydraulic analyses for the January 3, 1990 FIS were prepared by the U.S. Army Corps of Engineers (USACE), Sacramento District, for FEMA, under Inter-Agency Agreement No. EMW-86-E-2226, Project Order No. 3. This work was completed in November 1987. Patterson, City of The hydrologic and hydraulic analyses for the initial study were performed by the USGS for FEMA under Inter-Agency No. IAA-H-8-76, Project Order No. 7. That study was published in February 1979. The hydrologic and hydraulic analyses for the January 3, 1990 FIS were prepared by the USACE, Sacramento District, for FEMA, under Inter-Agency Agreement EMW-86-E-2226, Project Order No. 3. That work was completed in November 1987. Riverbank,City of A Flood Hazard Mitigation Study for the Stanislaus River was incorporated into the September 30, 2004 FIS. That study was prepared by the USACE, Sacramento District for FEMA under authority of Federal Disaster Designation DR-1155. That study was completed in May 2001 (Reference 1). Stanislaus County (Unincorporated Areas) The hydrologic and hydraulic analyses for the initial study were performed by the USGS, for FEMA, under Inter-Agency Agreement No. IAA-H-8-76, Project Order No. 2, Amendment No. 2. That work was completed in August 1978. The hydrologic and hydraulic analyses for the restudy were performed by the USACE, Sacramento District, for FEMA, under Inter-Agency Agreement EMW- 86-E-2226, Project Order No. 3. That work was completed in November 1987. A Flood Hazard Mitigation Study for the Stanislaus River was incorporated into the September 30, 2004 FIS. That study was prepared by the USACE, Sacramento District for FEMA under authority of Federal Disaster Designation DR-1155. That study was completed in May 2001 (Reference 1). Waterford, City of The hydrologic and hydraulic analyses for the January 1979 FIS were performed 2 by the USGS, for the FIA, under Inter-Agency Agreement No. IAA-H-17-75, Project Order No. 7. That work was completed in February 1978. The authority and acknowledgements for the Cities of Ceres, Hughson, Oakdale, and Turlock are not included because there was no previously printed FIS report. For this countywide FIS, Map IX-Mainland compiled existing data into a digital, countywide format under contract No. EMF-2003-CO-0047. This study was completed in October 2007. Base map information shown on the FIRM was derived from multiple sources. This information was compiled from the National Geodetic Survey, 2002, FEMA, 2004, and USGS, 1989 and 1993. Additional information was photogrammetrically compiled at a scale of 1:12,000 from aerial photography dated 2002. The coordinate system used for the production of this FIRM was Universal Transverse Mercator (UTM) Zone 10. The horizontal datum was the North American Datum of 1983 (NAD 83), GRS80 spheroid. Differences in the datum and spheroid used in the production of FIRMs for adjacent counties may result in slight positional differences in map features at the county boundaries. These differences do not affect the accuracy of information shown on the FIRM. 1.3 Coordination An initial Consultation Coordination Officer’s (CCO) meeting is held typically with representatives of FEMA, the community, and the study contractor to explain the nature and purpose of a FIS, and to identify the streams to be studied by detailed methods. A final CCO meeting is held typically with the same representatives to review the results of the study. The dates of the initial and final CCO meetings held for the communities within Stanislaus County are shown in Table 1, “Initial and Final CCO Meetings”. TABLE 1 – INITIAL AND FINAL CCO DATES Community Name Initial CCO Date Final CCO Date City of Modesto * April 3, 1979 First Revision * * City of Newman June, 1975 January 25, 1977 First Revision April 24, 1985 February 15, 1989 City of Patterson June, 1975 December 20, 1977 First Revision April 24, 1985 February 15, 1989 City of Riverbank September 10/11, 2001 * Stanislaus County (Unincorporated Areas) December 18, 1974 April 3, 1979 First Revision April 24, 1985 * *Date not available 3 TABLE 1 – INITIAL AND FINAL CCO DATES - continued Community Name Initial CCO Date Final CCO Date Second Revision * * Third Revision September 10/11, 2001 * Waterford, City of June 11, 1975 July 11, 1978 *Date not available For this countywide FIS, an initial CCO meeting was held on May 25, 2005.
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