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Contra Costa County, California VOLUME 1 OF 5 CONTRA COSTA COUNTY, CALIFORNIA AND INCORPORATED AREAS Community Community Name Number ANTIOCH, CITY OF 060026 BRENTWOOD, CITY OF 060439 CLAYTON, CITY OF 060027 CONCORD, CITY OF 065022 DANVILLE, TOWN OF 060707 EL CERRITO, CITY OF 065027 HERCULES , CITY OF 060434 LAFAYETTE , CITY OF 065037 MARTINEZ , CITY OF 065044 MORAGA , TOWN OF 060637 OAKLEY , CITY OF 060766 ORINDA, CITY OF 060722 PINOLE, CITY OF 060032 PITTSBURG, CITY OF 060033 PLEASANT HILL, CITY OF 060034 RICHMOND, CITY OF 060035 SAN PABLO, CITY OF 060036 SAN RAMON, CITY OF 060710 WALNUT CREEK, CITY OF 065070 CONTRA COSTA COUNTY (UNINCORPORATED AREAS) 060025 REVISED March 21, 2017 Federal Emergency Management Agency FLOOD INSURANCE STUDY NUMBER 06013CV001C 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: June 16, 2009 Revised Countywide FIS Dates: September 30, 2015 March 21, 2017 TABLE OF CONTENTS VOLUME 1 – March 21, 2017 Page 1.0 INTRODUCTION.......................................................................................................................... 1 1.1 Purpose of Study ............................................................................................................... 1 1.2 Authority and Acknowledgments ...................................................................................... 1 1.3 Coordination ...................................................................................................................... 9 2.0 AREA STUDIED ......................................................................................................................... 11 2.1 Scope of Study ................................................................................................................ 11 2.2 Community Description .................................................................................................. 14 2.3 Principal Flood Problems ................................................................................................ 16 2.4 Flood Protection Measures .............................................................................................. 29 3.0 ENGINEERING METHODS ..................................................................................................... 38 3.1 Hydrologic Analyses ....................................................................................................... 38 TABLES Table 1: Initial and Final CCO Meetings ..................................................................................................... 9 Table 2: Flooding Sources Studied by Detailed Methods .......................................................................... 11 Table 3: Flooding Sources Studied by Approximate Methods .................................................................. 13 Table 4: Letters of Map Change ................................................................................................................ 14 Table 5: Historic Floods ............................................................................................................................. 31 Table 6: Summary of Discharges ............................................................................................................... 56 Table 7: Summary of Elevations ................................................................................................................ 67 i TABLE OF CONTENTS, continued VOLUME 2 – March 21, 2017 Page 3.0 ENGINEERING METHODS, continued .................................................................................. 68 3.2 Hydraulic Analyses ......................................................................................................... 68 3.3 Vertical Datum .............................................................................................................. 105 4.0 FLOODPLAIN MANAGEMENT APPLICATIONS ............................................................. 108 4.1 Floodplain Boundaries .................................................................................................. 108 4.2 Floodways ..................................................................................................................... 116 FIGURES Figure 1. Floodway Schematic................................................................................................................. 124 TABLES, continued Table 8: Manning’s “n” Values ................................................................................................................. 97 Table 9: List of Structures Requiring Flood Hazard Revisions ............................................................... 101 Table 10: List of Certified and Accredited Levees .................................................................................. 103 Table 11: Vertical Datum Conversions .................................................................................................... 105 Table 12: Topographic Map Information ................................................................................................. 109 Table 13: Floodway Data ......................................................................................................................... 125 ii TABLE OF CONTENTS, continued VOLUME 3 – March 21, 2017 Page 5.0 INSURANCE APPLICATIONS ............................................................................................... 169 6.0 FLOOD INSURANCE RATE MAP ........................................................................................ 170 7.0 OTHER STUDIES ..................................................................................................................... 173 8.0 LOCATION OF DATA ............................................................................................................. 173 9.0 BIBLIOGRAPHY AND REFERENCES................................................................................. 173 10.0 REVISIONS TO THIS FIS ....................................................................................................... 186 10.1 Coastal Analyses ........................................................................................................... 186 10.2 Coastal Floodplain Boundaries ..................................................................................... 189 10.3 Second Revision – Riverine Analyses .......................................................................... 196 FIGURES, continued Figure 2: Transect Location Maps ............................................................................................................ 190 TABLES, continued Table 14: Community Map History ......................................................................................................... 171 Table 15: Transect Data Table .................................................................................................................. 194 EXHIBITS Exhibit 1 – Flood Profiles Along Giant Road from Standard Oil Tank to Rheem Creek Panel 01P Appian Creek Panel 02P Arroyo Del Hambra Creek Panels 03P-04P Brookside Road Tributary Panel 05P Brushy Creek Panels 05P(a)-05P(i) Cascade Creek Panel 06P Clayton Valley Drain Panels 07P-09P Corliss Drive Tributary Panels 10P-11P Deer Creek Panel 12P Ditch No. 2 Panels 13P-14P iii TABLE OF CONTENTS, continued VOLUME 3, continued – March 21, 2017 Exhibit 1 – Flood Profiles (continued) Donner Creek Panel 15P East Antioch Creek Panels 16P-19P East Branch Green Valley Creek Panel 20P East Branch Homestead Creek Panel 21P East Branch Refugio Creek Panels 22P-23P East Fork Grayson Creek Panels 24P-25P Farm Bureau Road Drain Panel 26P Frisk Creek Reach 1 Panels 26P(a)-26P(b) Frisk Creek Reach 2 Panel 26P(c) Galindo Creek Panels 27P-32P Garrity Creek Panel 33P Grayson Creek Panels 34P-35P VOLUME 4 Exhibit 1 – Flood Profiles (continued) Green Valley Creek Panels 36P-40P Grizzly Creek Panels 41P-42P Happy Valley Creek Panels 43P-45P Hidden Valley Creek Panel 46P Hillcrest Branch East Antioch Creek Panels 47P-48P Homestead Creek Panel 49P Ivy Drive Tributary Panel 50P Jonas Hill Creek Panels 51P-52P Kellogg Creek Panels 52P(a)-52P(f) Kellogg Creek Split Flow Panel 52P(g) Kirker Creek Panels 53P-57P Lafayette Creek Panels 58P-60P Laguna Creek Panels 61P-64P Larch Creek Panels 65P-67P Las Trampas Creek Panels 68P-80P Lauterwasser Creek Panels 81P-83P Lawlor Creek Panels 84P-85P Line A, DA-40 Panel 86P Los Medanos Wasteway Panels 87P-89P Mangini Creek Panel 90P Markley Creek Panels 91P-93P Marsh Creek Panels 94P-100P Middle Branch West Antioch Creek Panels 101P-102P Miranda Creek Panels 103P-104P Mitchell Creek Panels 105P-106P Moraga Creek Panels 107P-109P Mt. Diablo Creek Panels 110P-119P(e) Mt. Diablo Creek-Split Flow Panel 120P iv TABLE OF CONTENTS, continued VOLUME 5 – March 21, 2017 Exhibit 1 – Flood Profiles (continued)
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