Yuba County Comprehensive Flood Protection Program
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Transcript of Yuba County Comprehensive Flood Protection Program
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Yuba County Comprehensive Flood
Protection Program
Three Rivers Levee Improvement AuthorityReclamation District 784
County of YubaYuba County Water Agency
April 23, 2004
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Local Agencies Participating in Flood Control in Yuba County
• Yuba County
• Reclamation District No. 784
• Marysville Levee Commission
• Yuba County Water Agency
• Three Rivers Levee Improvement Authority
• Special Legislative District
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Flood History
Post Oroville and New Bullards Bar floods 1986 Linda Flood
7,000 acres inundated 4,000 homes & businesses damaged or destroyed $95 million in damages (1986 dollars)
1997 Arboga Flood 16,000 acres inundated 800 homes & businesses damaged or destroyed 3 lives lost
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Flood HistoryFlood History
1986 Flood View of
Linda with Marysville
in background
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Background (continued)Background (continued)
View of 1997
flooding along the
Feather River
1997 Arboga Flood
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Flood Control Goals
Short Term – Achieve a 200-year level of protection in RD 784 and 300-year level of protection in Marysville through construction of the Corps Yuba Basin Project
Long Term – Achieve a 500-year level of protection (YCWA Supplemental Flood Control Project Goal)
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Flood Control Projects
Corps System Evaluation Corps Yuba Basin Yuba-Feather Supplemental Flood Control
Project Y-FSFCP
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Corps System Evaluation Project
• Goal was to fix the levees to handle the 1957 design water surface profile
• RD 784 & Marysville Ring Levee– Improvements constructed between 1997 &
1999– Site 7 Extension to be constructed in 2004– Total cost is $49.7 million– YCWA betterments $2.4 million
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Corps Yuba Basin Project History
• In 1988, the Corps of Engineers initiated the Yuba Basin Project
• 15 years of study and analysis• Target level of protection 200-year RD 784 & 300-year
Marysville – 1998 Feasibility Study did not identify a need for work on the RD
784 Lower Feather, Bear & WPIC Levees for 200-year level of protection
• Construction initially targeted for 1997• Initial cost estimate $28 million • Congressional authorization 1999 (Chief’s Report)• Congressional approved construction start 2002
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Yuba Feather Supplemental Flood Control Project
• YCWA initiated feasibility study after 1997 flood to achieve a 500-year level of protection
• YCWA Study & South Yuba Wild & Scenic River SB 496 led to Costa-Machado Water Act (Prop 13) $90 million for Feather & Yuba
• Focused on improvements past base case of 200 & 300-year level provided by the Yuba Basin Project
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Y-FSFCP Components
• Colgate Tailwater Depression• New Bullards Bar Increased Outlet
Capacity• Feather River Levee Setbacks (upper &
lower)• Forecast Coordinated Operations• Thermalito Reoperation and Oroville
Surcharge concepts handed off to DWR
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Changing Conditions
1997 Flood Event New underseepage guidelines – requires more
work to achieve a given level of protection Revisions to hydrology
DWR Floodplain Mapping Study Identified FEMA deficiencies in RD 784
Lower RD 784 freeboard deficiency Yuba River left bank stability problem
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Changing Conditions Impact• Corps Yuba Basin Project
– No longer provides a 200-year level of protection for RD 784, especially in southern RD 784
– Underseepage requirement increased cost, requiring increase in Section 902 limit
– LRR initiated in 2003 with goal of construction ASAP– GRR contemplated for remainder of RD 784 & MLC– LRR preliminary result identify $108 million project
cost, but benefits will only support $90-$100 million– LRR scheduled completion date May 2005– Corps Yuba Basin Project decision point: Proceed
with LRR or switch to GRR given new LRR schedule
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DWR Floodplain Mapping Impact
• May 28, 2003 DWR released preliminary that identified 100-year deficiencies in RD 784
• DWR Floodplain Mapping Study - unknown impact on the remainder of RD 784 & MLC levees– Levee shown as failed unless enough geotechnical
data to show otherwise• Deficient levee reaches require FEMA
certification
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Proposed Strategy
• Goal – 200-year protection for RD 784 and MLC in the short term
• Proposed Strategy– Add WPIC and Bear River levees work to the
Y-FSFCP– Move Corps Yuba Basin Project to a GRR
• Include WPIC, Bear improvements and Feather River levee setbacks in GRR
– Request section 104 credit for Y-FSFCP towards Yuba Basin Project GRR
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Proposed Strategy Continued
• Secure local funding for WPIC, Bear and Yuba levee work
• Plumas Lake Mello Roos• Proposition 13 funds• YCWA funds
– Construct WPIC, Bear and Yuba levee projects as-quickly-as possible
– Leverage local and Proposition 13 expenditures for Yuba Basin non-Federal share
– Complete Corps Yuba Basin Project GRR and construct project
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South County Floodplain Issues:Local Response
• DWR provided notification to locals in May of 2003
• Locals funded and completed a problem identification study in Nov 2003 ($500K)
• First phase of alternatives analysis completed March 2004
• Y-FSFCP analysis of levee setback alternatives (underway since 2003) re-tracked to address South County issues
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South County Floodplain Program Goals
• Identify the extent of issues to be resolved to achieve FEMA certification
• Evaluate alternatives to provide the greatest level of flood protection possible
• Develop a financing plan
• Develop an implementation timeline
• Develop a solution that is politically, socially, and environmentally acceptable
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Revised Y-FSFCP Strategy
• Level of Protection – 200-year minimum goal – Phase 1 and 2
• 100-year WPIC & Upper Bear• Yuba River• Bear River Orchard• Olivehurst Detention Basin• Relocate or Improve Pump Station No.6
– Phase 3• 200-year with levee setback on Feather & Bear, or• 100-year by improve existing lower Bear River levee
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FEMA Fix vs. Y-FSFCP CostsLocal Funding: $25M
100-Year Solution Goal 200-YearProject: Strengthen existing levees to 100-year level of protectionCost: $25 MillionCompletion: November 2005
Project: Strengthen existing levees, plus setback leveeCost: $48-$75 MillionCompletion: November 2006 (fast-track)
Specific Project Elements:Upper Bear/ WPIC improvementsYuba River ImprovementsPump Station #6Bear River FloodwayOlivehurst Detention Basin Lower Bear/Feather Improvements
Specific Project Elements:Same as 100 year plan on upper Bear and WPICBear/Feather River Setback Levee
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Funding StrategyProp 13 grant funds potentially available $55 million
Net funds from local bond proceeds $25 million
Total potential construction budget $80 million
Additional funding potential:CDF&G enhancement funds for land purchase
$15 million
Total potential construction budget, with additional funding sources:
$95 million
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Y-FSFCP Phase 1• Goal – Restore design condition for WPIC and Upper
Bear• Rec Board permit application has been submitted on the
following features:– Strengthen WPIC and Bear River above Hwy 70 to pass the
1957 design profile– Erosion protection– Filling of landside ditch– Levee raising is not included in this phase
• Other work that may be added to Phase 1– Yuba River FEMA critical reach (only strengthening required) – Bear River Orchard Removal– Olivehurst Detention Basin
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Components of Current Rec Board Permit Application
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Schedule for Y-FSFCP• Phase 1 – 2004
– Strengthen WPIC & Upper Bear– Yuba River FEMA Critical Site– Bear River Orchard– Olivehurst Detention Basin– EIR for Levee Setback
• Phase 2 – 2005– Relocate or Improve Pump Station No.6– Raise WPIC and Bear River levees upstream of Hwy 70– Land acquisition if setback levee is feasible
• Phase 3– 2006 - Construct setback levee if feasible, or– 2005 - Strengthen Bear River levee downstream of Hwy 70
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Local Funding Plan
• Mello-Roos or other bond structure under consideration, but is contingent on development of Plumas Lake
• Target for net proceeds is about $25M
• Initial proceeds as early as July 2004
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Contingency Plan
• 100-year project can be completed with local funds– Addresses funding or CEQA issues outside of
local control– Requires Rec Board approval of
programmatic permit for staged 100 & 200-year plans
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Corps Yuba Basin Project GRR
• Project scope expanded to all RD 784 & MLC– Changing conditions necessitates reanalysis of all RD
784 & MLC levees– Opportunity to integrate YCWA levee setback flood
control planning effort into Corps Yuba Basin Project– Address all DWR issues
• Yuba River patrol road• Yuba River goldfields• Yuba River right bank levee in Marysville• Add Feather River levee setbacks• Address lower RD 784 levee issues
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Corps Yuba Basin Project Local Participation & Cost Share
• Y-FSFCP Program– Total cost for this program is $48-$75 million– Project cost potentially creditable through Corps
Section 104 authority– Completed in 2-3 years – Addresses FEMA certification
• Projected cost for Yuba Basin Project is $225 million– State share = $55 million– Local share = $24 million– Section 104 credit will significant reduce non-Federal
share
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Summary
• Provides improved protection for the existing 24,500 residents quickly
• Provides a plan for 200-year protection• Lessens State flood damage liability• Provides significant portion of Corps Yuba
Basin Project non-Federal share by leveraging Prop-13 funds through Section 104 credit
• Requires Mello Roos funds
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Next Steps
• Specific requests to Rec Board:– Grant Programmatic approval for Y-FSFCP
Program• Necessary for securing local financing
– Grant specific approvals for elements targeted for design & construction in 2004
– Support GRR approach for the Yuba Basin Project