2009 1029 PajaroRiverWatershedCouncil SCCOUNTY Presentation

Meeting of the Pajaro River
Watershed Council
October 29, 2009
1:30 pm to 4:30 pm
Watsonville Civic Plaza Community Room
275 Main Street, 4th Floor
Watsonville, CA 95076
Agenda Item #5
Lower Pajaro River Flood Risk
Reduction- Project Update
Pajaro River Levee
Reconstruction Project
US Army Corps
of Engineers
San Francisco District
Michael Sapunor, MCRP
Resource Planner III.
County of Santa Cruz
Department of Public Works
Pajaro River Flood Control Engineering
[email protected]
(831) 454- 2160
Existing Project
Mainstem Pajaro River
• Levee failure @ 17,000 cfs (8-year event)
Salsipuedes Creek (confluence to Hwy 152)
• 5,000 cfs (20-year)
Corralitos Creek (upstream of Hwy 152)
• 2,900 cfs (8-year)
Source: USACE in ENTRIX, Inc. Administrative Draft EIS/EIR 6-26-2009
No-Project 100-Year Floodplain:
Project Schedule
• Admin. Draft GRR completed March 2009
• 19 project alternatives
• USACE preparing responses to Sponsor
and City of Watsonville comments
• Draft EIS/EIR being prepared by
consultants- scheduled for June 2010
public release
2A T4 (2004 NED/LPP)
2004 NED/LPP Features
• 100-year protection for all areas
• New 100’ setback levees w/ bench
excavation for mainstem Pajaro R.
• Levees & floodwalls for SCC tributaries
• College Lake
9D T3 (2009 NED w/ 100-Year Floodplain)
Proposed 9d/T3 NED Features
• 100-year protection for urban areas and
some Ag. Lands
• No new levees below Hwy 1
• Reach 4- no new levee on right bank
• SCC tributaries- same as LPP
NED/LPP Comparison:
NED (9D T3)
• $163M Cost
LPP (2A T4)
• $275M Cost
$18M Annual
Benefits
$12M Annual Costs
$~6M Net Annual
Benefits
$20M Annual
Benefits
$19M Annual Costs
$~1M Net Annual
Benefits
Issues Raised Sept. 2009
in SC County Letter to USACE
1. Inequity in levee design-1 bank design
approach
2. Verify LOP in R1, with emphasis on
Pajaro Dunes
3. Verify Real Estate costs on Tributaries
4. Remove project design elements from
portion of Tributary design. Apply
savings to construct additional project
elements elsewhere.
5. Bench Excavation in Reach 3
Questions?
USACE Flood Risk Analysis
Annual probability of flooding
• Watsonville City (17%)
• Pajaro Community (18%)
Estimated annual damages ($ million)
• Mainstem Pajaro R. (Watsonville and Pajaro) $12.1
• Tributaries (Watsonville only) $8.1
Urban/Rural damages
• Mainstem- 68% urban, 32% crops
• Tributaries- 86% urban, 14% crops
Source: USACE in ENTRIX, Inc. Administrative Draft EIS/EIR 6-26-2009
Project Area Reaches:
Pajaro River Project
Presentation for Zone 7 Board Meeting
September 29, 2009
Excerpts from ACOE
Sept. 29th:
US Army Corps of Engineers
BUILDING STRONG®
San Francisco District
A Few Other Issues:
• Fate of “Legacy levees”
• TBD- impact of Federal and State ESA law
on project design and maintenance.
• Impact of pending USDA food safety
standards on Ag. land uses?
• Public involvement