FLOODPLAIN MANAGEMENT PLAN Monterey County, CA 2014 Update 2014 Update Prepared by: Monterey County Water Resources Agency Salinas Salinas River, March 1995 Pajaro, March 1995 Castroville, Floodplain March Management 1995 Plan Carmel River, February 1998 Monterey County, CA | ii Table of Contents 1. Introduction .................................................................................................................................... 1 1.1 Purpose and Scope ............................................................................................................................................... 1 1.2 The FMP and the FEMA NFIP/CRS Program ............................................................................................. 1 1.3 Goals of the FMP ................................................................................................................................................... 3 2. County Profile Summary ............................................................................................................. 5 2.1 Geography, Demographics, and Climate ..................................................................................................... 5 2.2 Watersheds ............................................................................................................................................................. 5 2.3 Government Structure ....................................................................................................................................... 6 2.4 Floodplain Management Program ................................................................................................................. 6 2.5 Development Trends in the Floodplain ...................................................................................................... 8 3. FMP Planning and Public Participation ................................................................................. 9 3.1 Background ............................................................................................................................................................. 9 3.2 Planning and Participation ............................................................................................................................... 9 4. Historical Flooding in Monterey County ............................................................................. 11 4.1 Flood Events of 1995 & 1998 ........................................................................................................................ 12 4.2 Recent Flood Events (2000’s) ....................................................................................................................... 15 4.3 History and Update on Disasters in Monterey County ....................................................................... 15 5. Monterey County Hazard Identification and Risk Assessment ................................... 17 5.1 Definition of Flood ............................................................................................................................................. 17 5.2 Flood Hazard Risk .............................................................................................................................................. 17 5.3 Flood Insurance Rate Maps and Monterey County Flood Maps ..................................................... 17 5.4 Monterey County Flood Insurance Study ................................................................................................. 19 5.5 Vulnerable Structures ...................................................................................................................................... 19 5.6 Repetitive Loss Property Vulnerability ..................................................................................................... 19 5.7 Additional Natural Hazards ........................................................................................................................... 25 6. Prevention Measures ................................................................................................................. 27 6.1 Current Prevention Measures ....................................................................................................................... 27 7. Property Protection ................................................................................................................... 31 7.1 FEMA Flood Mitigation Assistance Grants ............................................................................................... 31 7.2 Flood Insurance .................................................................................................................................................. 31 8. Natural Resources Protection ................................................................................................. 33 8.1 Natural Resources Protection Efforts ........................................................................................................ 33 8.2 Wetlands Protection ......................................................................................................................................... 33 8.3 Grading and Erosion Control ......................................................................................................................... 34 8.4 Construction Best Management Practices ............................................................................................... 34 8.5 Dumping Regulations ....................................................................................................................................... 35 9. Emergency Services .................................................................................................................... 36 9.1 Emergency Storm Response .......................................................................................................................... 36 9.2 ALERT Flood Warning System ...................................................................................................................... 36 9.3 Dam Safety ............................................................................................................................................................ 37 9.4 Sandbag Inventory and Sand Stockpiles ................................................................................................... 38 10. Structural Projects ...................................................................................................................... 39 10.1 Dams ........................................................................................................................................................................ 39 10.2 Levees/Floodwalls ............................................................................................................................................. 41 10.3 Drainage Facilities and Diversions.............................................................................................................. 42 10.4 Storm Drain Improvements and Basins .................................................................................................... 44 10.5 Stream, Channel, and Basin Maintenance ................................................................................................ 45 10.6 Flood Control Projects ...................................................................................................................................... 45 11. Public Information ...................................................................................................................... 58 11.1 Map Information ................................................................................................................................................. 58 11.2 Outreach Projects ............................................................................................................................................... 59 11.3 Real Estate Disclosure ...................................................................................................................................... 59 11.4 Library .................................................................................................................................................................... 59 11.5 Technical Assistance ......................................................................................................................................... 59 12. Repetitive Loss Areas ................................................................................................................. 60 12.1 Description of the Repetitive Loss Problem ............................................................................................ 60 12.2 Mitigation Options ............................................................................................................................................. 65 12.3 Repetitive Loss Area Outreach Project ...................................................................................................... 67 13. Flood Hazard Mitigation Goals and Action Plan ............................................................... 68 13.1 Administrative Action Items .......................................................................................................................... 68 13.2 Program Action Items .....................................................................................................................................