STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES

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STATE OF CALIFORNIADEPARTMENT OF WATER
RESOURCES

• Floodplain Management Activities
• Related to Map Modernization
• March 2007
• Ricardo Pineda, PE, CFM, Chief
• Floodplain Management Branch

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CALIFORNIA FLOODPLAIN MAPPING

• California faces unprecedented threats from
  catastrophic flooding
• We have to improve our understanding of
  Californias flood risk
• Inform public to protect lives and property
• Need to update FEMA maps for areas protected by
  project levees
• Support for flood control improvements

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CENTRAL VALLEY FLOODPLAIN MAPPING PLAN

• Initiating a 5-year, 130 million plan
• Approximate study limit boundaries
• Tehama in the North
• Kingsburg in the South
• Provide detailed flood mapping analyses
• for all systems impacting State-Federal
• Project Levees in the Central Valley
• Applicable for NFIP
• Foundation for flood hazard communication and all
  remedial actions

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MAJOR SCHEDULE CHECKPOINTS

• Initiation
• Four 5-year AE mapping contracts
• LOA with USACE for hydrology
• 10-, 50-, 100-, 200-, 500-year events
• At Two Years
• Complete Central Valley hydrology
• First set of mapping data available
• At Five Years
• Complete all detailed floodplain maps
• Pending funding, continue mapping other
  critical areas in the State

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DWR FLOODPLAIN MAPPING PROGRAMExecution Structure
DEPARTMENT OF WATER RESOURCES
MAPPING SUPPORT CONTRACT OVERSIGHT
CORPS OF ENGINEERS
Central Valley Hydrology
CORPS OF ENGINEERS
All Hydraulic QA/QC
CORPS OF ENGINEERS
Geotechnical
AE CONTRACT NO. 1
Upper Sacto River Basin
AE CONTRACT NO. 2
Lower Sacto River Basin
AE CONTRACT NO. 3
Lower SJ River Basin
AE CONTRACT NO. 4
Upper SJ River Basin
AE CONTRACT NO. 5
Map Processing
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PROCEDURE MEMORANDUM 34

• Dated August 22, 2005
• Interim Guidance for Studies Including Levees
• Must meet Freeboard, OM, and Stability
  Requirements (44 CFR 65.10 Next Slide)
• Requires Levee Certification from the Community
• Status Pass/Fail

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44 CFR 65.10 NFIP LEVEE DOCUMENTATION REQUIRED

• Embankment Protection
• Slope Stability
• Settlement
• Interior Drainage
• Freeboard
• Closure Structure
• Other Site Specific Criteria

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PROCEDURE MEMORANDUM 43

• What is a Provisionally Accredited Levee?
• A levee that FEMA has previously credited with
  providing 1-percent-annual-chance protection on
  an effective FIRM or DFIRM, for which FEMA is
  awaiting data and/or documentation that will show
  the levees compliance with Section 65.10 of NFIP
  regulations.

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KEY POINTS PM 43

• Federal and Non-Federal Levees
• Effective FIRM 100-Year Protection
• Supporting Documentation Must Comply with 44
  CFR 65.10 Requirements
• Possible 24 Month Grace Period
• Five Outlined Scenarios in PM 43

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SCENARIO A

• Non-Federal Levees
• Levees not in the Federal Levee System
• Effective FIRM 100-year protection
• Section 65.10 Documentation needed
• Notification By FEMA Regional Office
• PAL eligibility YES

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SCENARIO B

• Project Rating System - Acceptable
• Protection has not been shown as inadequate
• Levees in the Federal Levee System
• Effective FIRM 100-year protection
• Section 65.10 Documentation needed
• Notification By FEMA Regional Office
• PAL eligibility YES

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SCENARIO C

• Levee rated Fair, Poor, or Unacceptable
• USACE RIP status Inactive
• Levees in the Federal Levee System
• Effective FIRM 100-year protection
• Section 65.10 Documentation needed
• Notification By USACE, FEMA Reg. Office
• PAL eligibility NO

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SCENARIO D

• Levees not having 100-year Protection
• Levees in the Federal Levee System
• Effective FIRM No 100-year protection
• Section 65.10 Documentation not needed
• Notification By Not Applicable
• PAL eligibility NO

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SCENARIO E

• Inadequate USACE levee inventory
• Levee failed or overtopped
• Levees in the Federal Levee System
• Effective FIRM 100-year protection
• Section 65.10 Documentation needed
• Notification By FEMA Regional Office
• PAL eligibility NO

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RISK NOTIFICATION

• Provide Central Valley communities their level
  of flood risk based on best available
  information
• DWR/U.S. Army Corps of Engineers studies
• FEMA Flood Insurance Rate Map data
• Levee maintenance deficiencies
• Urges communities to use information to base
  future land use planning, emergency response
  plans, and public notification of risk

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COMMUNITY INVOLVEMENT IN FLOODPLAIN MAPPING

• Scoping Meetings
• Studies and Map Production
• Community Review and Appeals
• Map Adoption

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FEMA WEB SITES PROCEDURAL PLANNING GUIDANCE

• Levees
• http//www.fema.gov/plan/prevent/fhm/lv_intro.shtm
  
• Floodplain Managers, Surveyors, Engineers
• http//www.fema.gov/plan/prevent/fhm/lv_fpm.shtm
• Procedure Memorandum No. 43
• http//www.fema.gov/plan/prevent/fhm/pl_memo43.sht
  m
• USACE Guidance Document
• http//www.fema.gov/plan/prevent/fhm/lv_polg.shtm

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QUESTIONS?
THANK YOU Ricardo Pineda, CHIEF FLOODPLAIN
MANAGEMENT BRANCH DEPARTMENT OF WATER
RESOURCES TELEPHONE [phone] EMAIL
rpineda_at_water.ca.gov