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San Luis Obispo County, California and Incorporated Areas

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San Luis Obispo County, California and Incorporated Areas VOLUME 1 OF 2 SAN LUIS OBISPO COUNTY, CALIFORNIA AND INCORPORATED AREAS COMMUNITY NAME COMMUNITY NUMBER ARROYO GRANDE, CITY OF 060305 ATASCADERO, CITY OF 060700 EL PASO DE ROBLES, CITY OF 060308 GROVER BEACH, CITY OF 060306 MORRO BAY, CITY OF 060307 PISMO BEACH, CITY OF 060309 SAN LUIS OBISPO, CITY OF 060310 SAN LUIS OBISPO COUNTY 060304 (UNINCORPORATED AREAS) REVISED: November 16, 2012 Federal Emergency Management Agency FLOOD INSURANCE STUDY NUMBER 06079CV001B 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. 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: August 28, 2008 Revised Countywide FIS Date: November 16, 2012 TABLE OF CONTENTS – Volume 1 Page 1.0 INTRODUCTION 1 1.1 Purpose of Study 1 1.2 Authority and Acknowledgments 1 1.3 Coordination 4 2.0 AREA STUDIED 5 2.1 Scope of Study 5 2.2 Community Description 6 2.3 Principal Flood Problems 11 2.4 Flood Protection Measures 12 3.0 ENGINEERING METHODS 14 3.1 Hydrologic Analyses 14 3.2 Hydraulic Analyses 29 3.3 Vertical Datum 37 4.0 FLOODPLAIN MANAGEMENT APPLICATIONS 39 4.1 Floodplain Boundaries 39 4.2 Floodways 41 5.0 INSURANCE APPLICATIONS 70 6.0 FLOOD INSURANCE RATE MAP 71 7.0 OTHER STUDIES 71 8.0 LOCATION OF DATA 73 9.0 BIBLIOGRAPHY AND REFERENCES 73 i TABLE OF CONTENTS – Volume 1 - continued Page FIGURES Figure 1 – Floodway Schematic 44 TABLES Table 1 – Initial and Final CCO Meetings 4 Table 2 – Flooding Sources Studied by Detailed Methods 5 Table 3 – Letters of Map Change 6 Table 4 – Gage Information 17 Table 5 – Summary of Discharges 17 Table 6 – Summary of Elevations 28 Table 7 – Manning's "n" Values 34 Table 8 – Vertical Datum Conversion 38 Table 9 – Floodway Data 45 Table 10 – Community Map History 72 TABLE OF CONTENTS – Volume 2 EXHIBITS Exhibit 1 – Flood Profiles Arroyo Grande Creek Panels 01P-06P Atascadero Creek Panels 07P-10P Carpenter Canyon Creek Panel 11P Cayucos Creek Panel 12P Chorro Creek Panel 13P Corbett Canyon Creek Panels 14P-15P Deleissigues Creek Panels 16P-17P ii TABLE OF CONTENTS – Volume 2 - continued EXHIBITS - continued Exhibit 1 – Flood Profiles - continued Graves Creek Panels 18P-23P Little Cayucos Creek Panel 24P Little Morro Creek Panels 25P-26P Los Berros Creek Panels 27P-30P Meadow Creek Panels 31P-34P Morro Creek Panels 35P-37P Mountain Springs Creek Panels 38P-39P Nipomo Creek Panels 40P-43P Noname Creek Panels 44P-45P North Fork Los Berros Creek Panel 46P North Fork Paloma Creek Panel 47P Old Garden Creek Panels 48P-49P Paloma Creek Panels 50P-52P Peachy Canyon Creek Panel 53P Pismo Creek Panel 54P Prefumo Canyon Creek Panels 55P Prefumo Creek Panel 56P-57P Salinas River Panels 58P-66P San Luis Obispo Creek Panels 67P-73P Santa Margarita Creek Panels 74P-77P Santa Rosa Creek Panels 78P-80P Santa Rosa Creek Split Flow Panel 81P See Canyon Creek Panel 82P South Branch Toad Creek Panel 83P South Branch Unnamed Creek No. 1 Panel 84P Stenner Creek Panels 85P-86P Tefft Road Tributary Panels 87P-89P Tefft Road Tributary East Fork Panel 90P Toad Creek (Main and North Branch) Panels 91P-92P Toro Creek Panel 93P Unnamed Creek No. 1 Panels 94P-97P Unnamed Creek (Alva Paul Creek) Panels 98P-99P Willow Creek Panel 100P Yerba Buena Creek Panel 101P Exhibit 2 - Flood Insurance Rate Map Index Flood Insurance Rate Map ii FLOOD INSURANCE STUDY SAN LUIS OBISPO COUNTY, CALIFORNIA AND INCORPORATED AREAS 1.0 INTRODUCTION 1.1 Purpose of Study This Flood Insurance Study (FIS) revises and updates information on the existence and severity of flood hazards in the geographic area of San Luis Obispo County, including the Cities of Arroyo Grande, Atascadero, El Paso de Robles, Grover Beach, Morro Bay, Pismo Beach, and San Luis Obispo; and the unincorporated areas of San Luis Obispo County (referred to collectively herein as San Luis Obispo County), and 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 community that will be used to establish actuarial flood insurance rates and to assist the community in its efforts to promote sound floodplain management. Minimum floodplain management requirements for participation in the National Flood Insurance Program (NFIP) are set forth in the Code for 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 the unincorporated areas of, and incorporated communities within, San Luis Obispo County in a countywide format. 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. For this countywide revision, MAP IX-Mainland was contracted, under contract number EMF-2003-CO-0047, by FEMA to apply a countywide Vertical Datum Conversion to North American Vertical Datum 1988 (NAVD 88) from National Geodetic Vertical Datum 1929 (NGVD 29), and to provide a new FIS and Digital Flood Insurance Rate Map (DFIRM) panels that reflect these changes. Arroyo Grande, City of: The hydrologic and hydraulic analyses from the FIS report dated March 19, 1984, were performed by the U.S. Army Corps of Engineers (USACE), for the Federal Emergency Management Agency (FEMA), under Inter- Agency Agreement No. IAA-H-10-77. That study was completed in January 1983. 1 Atascadero, City of: The hydrologic and hydraulic analyses from the FIS report dated July 20, 1981, were performed by George S. Nolte and Associates, for the Federal Insurance Administration (FIA), under Contract No. H-4722. That work, which was completed in December 1979, covered all significant flooding sources affecting the City of Atascadero. El Paso de Robles, City of: The hydrologic and hydraulic analyses from the FIS report dated March 16, 1981, were performed by George S. Nolte & Associates, for the FIA, under Contract No. H-4722. That work was completed in December 1979. Grover Beach, City of: The hydrologic and hydraulic analyses from the FIS report dated August 1, 1984, were performed by the USACE and Tetra Tech, Inc., for FEMA, under Inter-Agency Agreement No. IAA-H-10-77 and Contract No. H-4543. That work was completed in January 1983. The FIS report dated November 5, 1997, incorporated a Letter of Map Revision (LOMR) issued on November 25, 1996. The LOMR showed the effects of revised hydraulic analyses based on updated topographic information along Meadow Creek. Morro Bay, City of: The hydrologic and hydraulic analyses from the FIS report dated December 18, 1979, were performed by the U.S. Geological Survey (USGS), for FEMA, under Inter-Agency Agreement Nos. IAA-H-17-75 and IAA-H-8-76, Project Order Nos. 8 and 13, respectively. The hydraulic analyses for this study were completed in June 1977. For the FIS report dated November 1, 1985, the coastal analysis was prepared by Dames & Moore for FEMA, under contract No. C-0970. The work was completed in 1984. Pismo Beach, City of: The hydrologic and hydraulic analyses from the FIS report dated February 1, 1984, were performed by the USACE and Tetra Tech, Inc., for FEMA, under Inter-Agency Agreement No. IAA-H-10-77 and Contract No. H-4543. That work was completed in January 1983. The FIS report dated November 5, 1997, incorporated a LOMR issued on November 25, 2 1996. The LOMR showed the effects of revised hydraulic analyses based on updated topographic information along Meadow Creek and Pismo Creek. San Luis Obispo, City of: The hydrologic and hydraulic analyses from the FIS report dated October 1978, were performed by the USACE, Los Angeles District, for the FIA, under Inter-Agency Agreement Nos. IAA- H-19-74 and IAA-H-16-75, Project Order Nos. 13 and 22, respectively. That work was completed in June 1977. San Luis Obispo County For the July 5, 1982, FIS, the hydrologic (Unincorporated Areas): and hydraulic analyses were completed in December 1979, by George S. Nolte and Associates, for FEMA, under Contract No. H- 4722. For the FIS dated July 18, 1985, the hydrologic and hydraulic analyses were completed in September 1982, by USACE, for the FEMA, under Inter-Agency Agreement No. IAA-H-10- 77. In coastal areas, the hydrologic analyses for this study were performed by Dames & Moore, for FEMA, under Contract No. C-0970. The coastal work was completed in July 1984. For the FIS dated June 3, 1991, the revised hydraulic analysis for Arroyo Grande Creek between the Union Pacific Railroad Bridge and the State Highway 1 Bridge was performed by the USACE, Los Angeles District, for FEMA, under Inter-Agency Agreement No.
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