Transcript Investor Presentation

Tetra Tech Certification Geographic Focus
• San Bernardino County (CA)
• Riverside County (CA)
• Ventura County (CA)
• Washington DC
• City of Kent (WA)
• City of Massillon (OH)
• City of Aurora (CO)
• Papio NRC/Omaha (NE)
The FEMA Program
PM34 Certify Levees
PM 43 PAL Program
PM 45 PAL Note
PM52 Decertified Levee
Mapping
PM 53 Expiring PALs
PM51 Non-levee
Embankments
PM63 Technical Review
Process
NFIP Regulations: 44 CFR 65.10
FEMA Procedural Memorandums
PM-34
Issued August 2005
Identify all Levees on Map
Responsibility of Community
PM-43
Issued March 2007
Established Provisionally Accredited Levees (PAL)
Allows 2-years to Provide 65.10 Documentation
www.fema.gov/library
FEMA Procedural Memorandums
PM-63
Issued September 2010
Levee Accreditation Checklist
Tiered Review process
Upstream and Downstream tie-in
Tie-in to High Ground
natural high ground?
FEMA Certification Comments
NFIP Regulations (44CFR65.10)
Design Criteria
• Freeboard
• Closures
• Embankment Protection
• Stability
• Settlement
• Interior Drainage
Operations Plan
Maintenance Plan
http://www.gpo.gov/
Freeboard
BASE Freeboard
3’ (riverine)
2’ (coastal)
ADDITIONAL Freeboard
+1’ at constrictions (bridges)
+0.5’ upstream end
Exceptions (R&U)
Hydrologic Record
Hydraulic Sensitivity
Geotechnical (coming)
freeboard
Freeboard
Levee Station
Equivalent
Record
Length (year)
Top of Levee
Elevation
(feet)
100-year
Water Surface
Elevation
(feet)
Actual
Freeboard
(feet)
CNP for a
100-year
flood event
Minimum
Freeboard
(feet)
Minimum
Top of Levee
Elevation
(feet)
CNP2 for a
100-year
flood event
99.98%
3
1,889.41
95.7%
3
2,280.81
88.9%
3
2,257.87
80.7%
3
1,816.46
79.7%
LOWER DEVORE LEVEE
200+98.68
71
1,894.68
1,886.41
8.27
MILL CREEK LEVEE
197+93.11
191+92.95
79+94.76
52
52
52
2283.22
2266.68
1821.46
2277.81
5.41
91.03%
11.81
100.00%
8.00
99.95%
2254.87
1813.46
DEMENS LEVEE
17+26.23
45
2124.15
2112.83
11.32
99.85%
3
2,115.83
90.1%
5+62.00
45
2007.55
2002.13
5.42
100.00%
3
2,005.13
92.9%
Closures
“All openings must be provided with closure devices”
Closures
“All openings must be provided with closure devices”
Spillways
Side drain pipes – options?
Channels / canals
FEMA Certification Comments
Geotechnical
Stability
USACE EM 1110-2-1913
Settlement
USACE EM 1110-2-1904
Interior Drainage
Joint Probability
Analysis
• River stage
• Local runoff
Operation Plan
Officially Adopted Plan
• Responsibility – name/title
• Any Manual Operation?
> Flood Warning
> Implementation Plan
FEMA Certification Comments
Maintenance Plan
FEMA Certification Comments
Vegetation Policy
USACE ETL 1110-2-571 - Guidelines for Landscape
Planting and Vegetation Management at Levees,
Floodwalls, Embankment Dams, and Appurtenant Structures
Figure 1: Levee Section - Basic
Segmenting
Without Levee
Analysis
What does it mean?
Without Levee
Analysis
What does it mean?
When will we know
what it means?
Levee Evaluation and Rehabilitation
Questions & Answers
Potomac Park, Washington DC
Potomac Park, Washington DC
PAL Certification Timeline
2005
COE/Tt Robles Dam Modifications
1949t
2009
VC/Tt Phase I Evaluation
FEMA/HDR FIS
Matilija Dam
1970
NFIP Regs
1958
Robles Diversion Dam
2010
2000
COE/BOR Study
Matilija Removal
2005
2000
1950
1958
Castaic Lake
2011
COE/Fugro Inspection (Spring)
VC/KC 30% CdSJ design (July)
VC/Tt CTP Study (Nov)
2010
VC/COE/Tt Develop Study Paths
VC/Tt Stop-log Maintenance Review
VC/Tt Meiners Oaks / Live Oak Design Review