mike park - "greater new orleans hurricane and storm damage risk reduction system"
DESCRIPTION
Building Resilience Workshop II: 2011TRANSCRIPT
US Army Corps of Engineers BUILDING STRONG®
Greater New Orleans Hurricane and Storm Damage
Risk Reduction System
Mike Park
Chief Task Force Hope
Mississippi Valley Division U.S. Army Corps of Engineers
March 18, 2011
BUILDING STRONG®
Legend
Federal Federal Non-COE Non-Federal
5 Parishes 350 Miles of Levee/Floodwall 78 Pumping Stations (Fed & Non-Fed) 4 Gated Outlets
New Orleans Area Hurricane and Storm Damage Risk Reduction System
8 to 15 feet
10 to 13 feet
12 to 15 feet
9 to 11 feet
High: 15 Ft.
Low: 0 Ft.
Design Failure Breach Locations
New Orleans Maximum Flooding Depth
Perimeter Risk Reduction
4
-1
0
1
2
3
4
5
6
7
8
1 1.1 1.2 1.3 1.4 1.5 1.6 1.7
Time (days)
Elev
atio
n (ft
)
Hurricane Paths Considered in the Risk Analysis
• 3 HSDRRS Geometries § Pre-Katrina § Current (1 June 07) § 100-year LOP (~2011)
• 152 storms § 25 yr to 5,000+ yr
• 350+ features § Floodwalls § Levees § Pumps Stations
→ 62,928 Hurricane Hydrographs
BUILDING STRONG®
HSDRRS Hydraulic Design Criteria
§ 100-yr still water plus waves – 90% confidence of non-exceedence
§ Wave overtopping not greater than 0.1 cubic feet per second per foot
§ 500-yr still water – 50% confidence of non-exceedence
§ Floodwalls and structures constructed for 2057 conditions
6
BUILDING STRONG® 7
100-yr Still Water Elevation*: EL +18’
500-yr Still Water Elevation*: EL +21’
GIWW North Levee, Adjacent to IHNC Surge Barrier
(not labeled to scale)
* Still water elevation does not include waves DESIGNED FOR A 100-YR STORM SURGE EVENT
Top of Levee: EL 32’
St. Bernard Floodwall, near the IHNC Tie-In
(not labeled to scale)
Top of Floodwall: EL +32’
100-yr Still Water Elavation*: EL +18’
500-yr Still Water Elevation*: EL +22’
8
* Still water elevation does not include waves DESIGNED FOR A 100-YR STORM SURGE EVENT
Katrina Storm Surge: EL +25’
9
Top of Surge Barrier: EL 26’
100-YEAR STILL WATER ELEVATION *: EL +18.8’
500-YEAR STILL WATER ELEVATION *: EL +22.5’
Lake Borgne Surge Barrier “Great Wall of Louisiana”
(not labeled to scale)
9
* Still water elevation does not include waves DESIGNED FOR A 100-YR STORM SURGE EVENT
Armoring
10 Wave Overtopping Testing
Grass Armoring
Transition Armoring
Scour at Bayou Bienvenue Armoring at Bayou Bienvenue
BUILDING STRONG®
Pump Station Storm Proofing § Improvements
► Installation of emergency generators ► Raising machinery ► Hardening structures ► Automation ► Safe Houses
§ $340 million currently appropriated § 34 pump stations
12
BUILDING STRONG® 13
Buying Down Risk
Risk
Initial Risk
Zoning / Building Codes
Coastal Protection and Restoration
Outreach
Evacuation Plan
Insurance
Levees / Floodwalls / Structures
Residual Risk