Presented by: Connie Perkins, PE, CFM April 20, 2016

Transcription

1 Presented by: Connie Perkins, PE, CFM April 20, 2016

2 City of Sacramento s Flood History Need for a Comprehensive Flood Management Plan (CFMP) Overview of Sacramento s CFMP 2016 Next Steps

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5 Sacramento has experienced great floods events in 1860, 1911, 1913, 1950, 1955, 1963, 1964, 1986, 1995 and 1997

6 1956 Record Flood: Though engineers had been predicting it would take a year to fill the nearly completed upstream Folsom Dam, the second record storm filled the dam in a week and Sacramento is saved from flooding Record Flood: The 3rd record flood in less than 15 years. Engineers concluded that Folsom Dam was only designed to handle is a 120-yr storm, not a 500-yr storm Record Flood: 10 in. of rain in 11 days. Folsom Dam downgraded to about a 60-year storm. Corps determines that a majority of the city does not have 100-year protection.

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11 Proposed Change to State Hazard Mitigation Plans to Address Future Climate Variability Issues (2014) E The Federal Flood Risk Management Standard for federal agencies (2015) Central Valley Flood Protection Plan SB5 (2016) New Development standard 200-year flood ULDC

12 City s strategic plan to reduce flood risk over the next 5 years. A comprehensive management document that will guide the City s flood risk reduction and mitigation efforts.

13 LOW RISK HIGH RISK Flood risk reduction is best achieved by employing a suite of risk reduction tools. LAND USE PLANNING FLOOD RISK REDUCTION DEV STANDARDS EMERGENCY PREP LEVEE IMP INTERNAL DRAINAGE RISK COMMUNICATION NFIP/CRS RISK REDUCTION TOOLS

14 Purpose Historical Perspective Land Use Planning and Development Guidelines Emergency Preparation Levee and Other Structural Improvements Internal Drainage Risk Communication National Flood Insurance Program (NFIP)/Community Rating System Program (CRS)

15 Rescue Zones Evacuation Plans for special needs facilities (schools, hospitals etc.); Identification of refuge and evacuation locations for special needs facilities, new residential developments, large commercial and public buildings Rescue and Evacuation Zones Identification of emergency vehicle access to subdivisions Provision of infrastructure to protect on-site fuel storage.

16 Rescue Zone: An area of the City that would flood to a depth of 1 foot in 2 hours.

17 Central Valley Flood Protection Plan (CVFPP) Requirements 200-year flood protection by July 2016 Levee clearance, encroachments, and maintenance requirements New state building code standards for evacuation

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19 Connecting all emergency response documents Emergency Action Plans separate Response Everbridge System Critical Facilities List Observation & Recording Flooded Areas Recovery Plan Damage Assessment Recovery Ordinance Rescue & Evacuation Maps Based on 200-year flood State requirement Animated levee break scenarios

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23 Major projects(corps, SAFCA, & DWR): American River Common Features Project Sacramento Urban Area Levee Reconstruction Project South Sacramento Stream Groups Folsom Dam Modifications/Joint Federal Project Natomas Levee Improvement Project

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25 42 miles total 18 miles completed 24 miles to finish

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27 Levee Accreditation Plan Corps expired the City s certifications 5 to 7 years Levee Modernization Plan 200-year plan

28 Since 1955, most of the City s flood damage has resulted from drainage deficiencies 1,354 miles of storm drain pipes; 49,914 drain inlets; and 105 pump stations The drainage system is sized based on outdated hydrology and does not have capacity to drain a 100-year storm event Approximately $70 million of the highest priority projects have been completed over the last 11 years, but a backlog of over $500 million in projects remains

29 City/County Watershed Management Plan (WMP) Reducing the increased flooding from development on watershed-wide basis

30 Brochure in City s Utility Bill annually Mailing to Repetitive Loss properties State of CA s Flood Risk Notice to 200-yr floodplain properties Billboards, advertisements on buses, community meetings and events High Water Mark Signs

31 Program For Public Information Flood Response Plan Flood Insurance Coverage Improvement Plan Repetitive Loss Area Analysis Community Rating System (CRS)Credit

32 Flood insurance 43,000 policies CRS Rating of 5 Equals a 10-25% reduction in flood insurance rates Equals a savings of $1.3 million/yr to the community

33 Adopt 2016 CFMP May 3, 2016 Initiate annual implementation program Future updates every 5 years

34 Connie Perkins, PE, CFM Senior Engineer