sacramento area levee accreditation key results from encroachment analysis
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Sacramento Area Levee Accreditation Key Results from Encroachment Analysis. Presented to: Central Valley Flood Protection Board August 23, 2013. Presentation Outline. Levee certification overview USACE encroachment assessments - PowerPoint PPT PresentationTRANSCRIPT
Presented to:
Central Valley Flood Protection BoardAugust 23, 2013
Sacramento Area Levee AccreditationKey Results from Encroachment Analysis
Presentation Outline
Levee certification overview
USACE encroachment assessments
Examples of permitted encroachments contributing to
USACE “Unacceptable” rating
Draft Encroachment White Paper overview
Next steps
Levee Certification Overview
In 1998, Sacramento area levees reaccredited by FEMA based on
USACE certification
Certain levees recertified by USACE in 2004, 2007 and 2010
In past, levee certification had no expiration date
EC 1110-2-6067 was published in 2010 by the USACE to standardize
USACE’s levee evaluation procedures to support the National Flood
Insurance Program (NFIP)
Per EC, the current USACE certification letters expire in August 2013
CA SB5 requires levee owners to meet Urban Levee Design Criteria
(200-year event) by 2025
Levee Certification Overview
American River*
Arcade Creek
Dry Creek
Sacramento River
Beach Lake Levee*
* Awaiting USACE letter of acceptance based on levee design and past performance
NEMDC (east levee)
Levee Certification Overview
SAFCA has taken lead to certify area levees in accordance with:
44 CFR Section 65.10 (FEMA)
ULDC criteria (DWR)
Evaluation started in 2012 with team of consultants
As-built data collection
Geotechnical data collection and analysis
H&H analysis
Encroachment and Vegetation analysis
Certification documentation
Levee evaluation findings:
Inadequate embankment and foundation stability– Up to 8 miles of Sacramento River East Levee – Up to 3.7 miles of Arcade Creek levees
Up to 2500’ of Erosion sites along Sacramento River
Encroachments and Vegetation
Levee Certification Overview
USACE Encroachment Assessment
USACE criteria for Acceptable, Minimally Acceptable, and
Unacceptable encroachments:
USACE Encroachment AssessmentSummary of USACE Periodic Inspection Reports (PIR’s)
AR-04 & 05 Encroachments Rated Unacceptable Examples include retaining walls (non complaint) within levee
section, buildings within 15 feet, fencing within O&M corridor.
Sac-D Encroachments Rated Unacceptable Examples include abandoned building within levee, locomotive
and railcars stored on top of levee, floodwall penetrations, encroachments within O&M corridor impeding access.
MA-9 Encroachments Rated Unacceptable Examples include irrigation lines and retaining walls within levee,
swimming pools at levee toe, abandoned irrigation facilities, fencing and landscaping impeding maintenance access.
USACE Encroachment AssessmentSummary of USACE Periodic Inspection Reports (PIR’s)
AR-03 (North Levee NEMDC to Arden) Encroachments Rated Unacceptable Examples include landside fencing on levee, unpermitted
encroachments (utilities, buildings) within and on levee. North Area Streams (NEMDC East, Arcade, Dry Creek)
Encroachments Rated Unacceptable Examples include landside fencing within O&M corridor,
and numerous utilities some abandoned.
Examples of permitted encroachments contributing to USACE “Unacceptable” rating
Railroad tracks and material storage impede
maintenance and inspection access
Examples of permitted encroachments contributing to USACE “Unacceptable” rating
Vegetation, Retaining Wall, Access Impeded
Examples of permitted encroachments contributing to USACE “Unacceptable” rating
Dense Landscaping Impedes Inspection
Fencing and Structures Impede Landside Access
Examples of permitted encroachments contributing to USACE “Unacceptable” rating
Building, Fencing Impede Access
Examples of permitted encroachments contributing to USACE “Unacceptable” rating
Landscaping, Building Impede Landside Access
Examples of permitted encroachments contributing to USACE “Unacceptable” rating
Vegetation, Fencing, Structures Impede Inspection and Access
Examples of permitted encroachments contributing to USACE “Unacceptable” rating
Abandoned Irrigation
Development of assessment criteria Formulated based on Title 23, USACE and ULDC criteria
Types of encroachments addressed Levee Penetrations (handled under geotechnical evaluation) Landscaping and vegetation (handled under vegetation
white paper) Buildings Retaining Walls Stairways Fences Electrical Landscape Irrigation
Draft Encroachment White Paper Overview
Draft Encroachment White Paper Overview
Proposed classifications:
Significant Threat to Levee Integrity – Remediate or remove prior to FEMA certification
Lower Threat to Levee and/or Impedes Operations, Maintenance, and Inspection - Remediate or remove within three years of certification
Compliant permitted encroachments
Next Steps
Application of Draft White Paper Evaluation of over 2,000 Non-Vegetation Encroachments
(majority not documented by permit) Finalize White Paper Present CVFPB with Findings
Coordinate with Encroachment owner Request CVFPB to modify or revoke permit
Next Steps - Timeline
Estimated certification timeline should the non-Federal partners implement the improvements necessary for certification ahead of the USACE:
American River Levees Construction by the USACE is completed in 2014 FEMA Certification one year after construction completion Bring Category 1 encroachments into compliance within six months of construction completion Bring Category 2 encroachments into compliance within three years of certification
North Sacramento Streams Levees (NEMDC, Arcade, Dry, and Robla creeks) Construction completed in four to six years FEMA Certification within one year of construction completion Bring category 1 encroachments into compliance within six months of construction completion Bring category 2 encroachments into compliance within three years of construction completion
Sacramento River East Levee (American River confluence to Freeport) Construction completed in four to six years FEMA Certification within one year of construction completion Bring category 1 encroachments into compliance within six months of construction completion Bring category 2 encroachments into compliance within three years of construction completion
Discussion