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Coastal Best Coastal Best PracticesPractices
Project OverviewJuly 2010July 2010
Overview• Coastal Louisiana Context• Patterns of Coastal Development• Atlas• Strategies for Community Adaptation• Strategies for Structures• Strategies for Structures• Building Prototypes
C t l Coastal Louisiana Context
The 2005 Hurricanes
Louisiana Speaks: The Vision
New Growth Areas
Economic Development
The Vision: New Growth Areas
JenningsJenningsCrowley
Abbeville New Iberia
The Vision: New Growth Areas
La PlaceKenner/MetairieD ld ill Kenner/MetairieDonaldsonville
Thibodaux
Westwego/MarreroGretna/
M Ci Thibodaux
RacelandAlgiersMorgan City
Larose
The Vision: New Growth Areas
Hammond CovingtonHammond Covington
SlidellMandeville
La PlaceLa PlaceKenner/Metairie
Multiple lines of defense
Special Cases: Economic Devt. Zonesp
Coastal LouisianaLiving with water is a way of life
Levee building in the 1950s - present
• Influenced where growth was possible
• Enabled development on lands constrained by flooding
Levee Farms, Wayne Thiebaud
Man Made and Natural Changes
Matthew Levine
Rebuilding - Holly Beach, Louisiana
Patterns of Coastal Coastal
Development in Development in LouisianaLouisiana
Coastal Development Patterns
• Water and Geology– Riverbanks and Bayous– Coastal
Floodplains– Floodplains • Development patterns form in relation to
water marsh elevation levees andwater, marsh, elevation, levees and roadways
• Produce a unique pattern that needs to be accommodated and understoodaccommodated and understood
Coastal Development Patterns
Small neighborhoods
Small neighborhoods (intersection water, road)
Small neighborhoods
Water serves as the “back yard”
Water is the backyard: boat garden, docks
Road is front yard: garage, garden, neighbors
Bayou: long continuous line of row houses
Bayou: houses perpendicular to water
Urbanization pattern: Old housing on river banks
Economics: Fishing
Infrastructure located on man-made fill
History of housing on the rivers, floating homes
History of stilt houses in the swamps
Water protection: Levee from river/spillway
Beach: roads/houses perpendicular to shoreline
Beach: roads/houses parallel to shoreline
Beach: neighborhoods
Urbanization pattern: Housing along bayous, houses on stilts
Economics: Agriculture, fishing, crabbing, hunting, trapping
Economics: Recreational fishing
Industry
Agriculture
AtlAtlasPurpose is to gather best available
data and make it useful for community planning
Aerial Photography
Source: ESRI
Aerial Photography and City Limits
Source: ESRI and Louisiana GIS Digital Map 2007
Transportation
Source: ESRI
Transportation
Source: ESRI
GIS Data LayersChenier, Delta, and Riverine
Source: Louisiana Office of Coastal Protection and Restoration
Geology – Freshwater Delta & Riverine
Source: Louisiana GIS Digital Map 2007
FEMA 30 Year Floodplain
Source: FEMA
FEMA 30 Year Floodplain
Source: FEMA
Land Use
Source: Louisiana Speaks
Land Use
Source: Louisiana Speaks
50 Year Predicted Land Loss
Source: USGS
50 Year Predicted Land Loss
Source: USGS
Create a readily available planning tool
GIS system is kept up to date with readily available public datay p p y p
Site hosted that provides GIS data and a Storefront for maps
Reduce time necessary to find and access the public data
Strategies forgCommunity Community AdaptationAdaptationHow do you plan a y p
community where there will be occasional flooding?be occasional flooding?
Strategies for Communities
1. Prevent flooding – Build levees; S S fSediment diversion; Strengthen borders of flood prone areas; Armor and fill
2 Adapt to occasional flooding2. Adapt to occasional flooding –Develop community-wide approaches that adapt to occasional floodwaters; Developadapt to occasional floodwaters; Develop resiliency; Minimize property damage from flooding
3. Relocate when absolutely necessary – Relocate part or all of a y pcommunity to a more stable area
1. Prevent Flooding – Global Examples
–Build barriers to fortify borders of–Build barriers to fortify borders of flood-prone areas
–Use natural processes: sediment diversion to rebuild land area; wetland restoration to prevent land lossloss
Netherlands
© Bosch Slabbers
Prevent flooding: barriersNetherlandsSeawall protecting against a storm surge
© Bosch Slabbers
Source: DeltaWorks.org
© Bosch Slabbers
© Bosch Slabbers
Prevent flooding: barriersBangladeshRetractable brick walls can be moved as necessary to protect the community
Source: flickr.com/CLTS
Prevent flooding: barriersCaliforniaRiver island LEVEES protect valuable farmland in central the SacramentoSan Joaquain Delta
Prevent flooding: barriersSand Dunes (natural)
© Bosch Slabbers
Prevent flooding: barriersDikes (manmade)
© Bosch Slabbers
Prevent flooding: barriersDelta Works Netherlands
Major engineering project (19501997) to jshorten the Dutch coastline and reduce miles of needed dikesmiles of needed dikes
Source: DeltaWorks.org
Prevent flooding: barriersDelta Works Netherlands
Prevent flooding: LouisianaTeam New Orleans (USACE)
Inner Harbor Navigation Channel (IHNC) S b i i lSurge barrier in coastal Louisiana
flickr./infrogmation
Prevent flooding: barriersSimilar to a floodwall but much larger the IHNC is a surgeSimilar to a floodwall, but much larger, the IHNC is a surge barrier to protect New Orleans and St. Bernard Parish against storm damage, to be completed in 2011
NOLA.com
Prevent Flooding: pumpPump It Up –
Community Level ProtectionProtection
In New Orleans a pump station is currently under construction that can pump 150,000 gallons of floodwater per second
Prevent flooding – watery cityTigre Delta, ArgentinaThe city relies on waterways and boats for transportation.
Prevent flooding: dredging
.
By preventing flooding upland, the likelihood of flooding increases in lowf f gincome communities nearer the river
NORDELTA, a gated communityNORDELTA, a gated community engineered out of wetlands in
Tigre, Argentina
Source: Columbia University Planning Studio
Prevent flooding
Adapt to flooding
d fl dAvoid flooding
This aerial image illustrates the disparity between those who live in protected upland communities and those who do not.
Relatively small area protected in Louisiana
Source: Louisiana GIS Digital Map 2007
2. Adapt to Occasional Flooding
• Community approaches to live with • Community approaches to live with occasional flooding
Structural responses that avoid or allow– Structural responses that avoid or allowfloodwaters
– Develop resilience to occasional floodingDevelop resilience to occasional flooding, prepare property and vital infrastructure
– Build strong communities where flooding is aBuild strong communities where flooding is a nuisance, not a disaster
Adapt: controlled floodingNetherlandsCANALS allow for controlled flooding into pasture lands as needed
Adapt: Accept occasional floodwaters
Venice, ItalyR id f fl d
Prepare for Occasional Floodwaters
Residents prepare for floodwaters entering buildings and public spaces
Adapt: activities and attitudesPEOPLE
T i i V iTourists in Venice
Floating markets of Vietnamf
Adapt to occasional flooding
Flooding and a tourism experience
3. Relocate
• Relocating part or all of a community Relocating part or all of a community away from flood danger may be the best option in some scenarios
– Cost to stay > cost to move– Use of temporary or low-cost structuresp y– Seasonal or vacation inhabitation
RelocateMekong Delta, Vietnam:
As part of LIVING WITH FLOODS program, the Vietnamese government has begun relocating floodprone, highrisk communities to “residential clusters” on higher ground.
RelocatePo Delta, ItalyAbandoned fishing villages
RelocateAfter decades of frequent flooding, water encroachment, and land subsidence, they faced the painful decision of whether to stay or go
Isle de Jean Charles, LouisianaBiloxiChitimachaChoctaw tribe
stay or go.
Images: NOLA comImages: NOLA.com
RelocateIsle de Jean Charles, Louisiana
Relocate PREGustav POSTGustav
Louisiana’s coastal land is dynamic and frequently changing
NASA’s Landsat imagery documents land loss due to Hurricane Gustav (2008)
Source: NASA.gov
Historic Land Loss
Source: LSU CLEAR Land Change Module
Historic Land Loss
Source: LSU CLEAR Land Change Module
Historic Land Loss
Source: LSU CLEAR Land Change Module
Historic Land Loss
Source: LSU CLEAR Land Change Module
Historic Land Loss
Source: LSU CLEAR Land Change Module
St t i f Strategies for Structures
How do you build in areas that may flood?that may flood?
Strategies for Structures1. Berm and armor to protect structures and keep water out
2. Elevate with stilts or pole structure to move structures above floodwaters.
3. Flood proofing of buildings so that they can be readily cleaned and returned to active use quickly.
4. Temporary structures that can be rebuilt with relative ease because of lower investment costs.
5. Floating structures either permanently on the water or on land that can float when/if needed.
1. Berm & Armor
FloodwallFloodwall
Sump and pump for internal drainage
Sump and pump for internal drainage
Berm or Berm or LLeveeLevee
One way valveOne-way valve
SewerSewer
One-way valveOne-way valve
1. Berm & Armor
2. Building ElevationCommon StrategyInnovative and traditional development patterns and styles avoid flood damagep y f g
Around the world, entire communities are raised on stilts to avoid structural flooding, while accommodating the occasional land flooding
Tigre, Argentina
Tigre, Argentina
2. Building Elevation
Coastal Louisiana
2. Building Elevation
Pier Foundation
2. Building Elevation
3. Flood Proofing
Maximum ProtectionLevel is Three FeetMaximum ProtectionLevel is Three FeetLevel is Three FeetLevel is Three Feet
One-Way ValveOne-Way ValveSewerSewer
Closures for OpeningsClosures for Openings
Flood Proofed WallsFlood Proofed Walls
One-Way ValveOne Way Valve
Dry Floodproofing
3. Flood Proofing
O i t L tOpening to LetF d UtilitiF d Utiliti Opening to LetWater In
Opening to LetWater In
Furnace and UtilitiesRelocated
Furnace and UtilitiesRelocated
Appliances Moved or Wrappedin Waterproof Bags
Appliances Moved or Wrappedin Waterproof Bags
Wet Floodproofing
3. Flood Proofing
Flood Proof Walls, Move HVAC & Electrical
Install Sewer Backflow Openings, Foundation Move HVAC & Electrical Valve
4. Temporary Structures
4. Temporary Structures
http://tinyhouseblog.com/pre-fab/habitaflex/p y g p
5. Floating StructuresHybrid foundations allow
buildings to float Massbommel NetherlandsMassbommel, Netherlands
5. Floating Structures
© Bosch Slabbers
5. Floating StructuresPortland, Oregon Oaks Park Roller Rink
The skating rink was built in 1905 in a fl d l i Aft fl d i 1948 i dfloodplain. After a flood in 1948 ruined the rink's wood floor, the rebuilt floor was designed to float in the event of another flood. Since then, the floating floor has f f g fsurvived two serious floods in 1964 and 1996.
Source: http://myweb.msoe.edu/~westr/pdxoaks.htm
5. Floating Structures
The FLOAT House New OrleansThe FLOAT House, New Orleans
i iBuilding Prototypesyp
Modules that can be used in planning exercisesplanning exercises
Purpose is to match building strategies with community strategies with community
protection
Traditional Compact Traditional Compact Waterfront Residential Waterfront Commercial Community CenterpResidential ‐1 Story
pResidential ‐2 Stories
y
Main Street Commercial‐ Main Street Commercial‐ Main Street Commercial‐ Multifamily Waterfront Hotel 1 Story 2 Stories 3 Stories and Restaurant
House Boat
Prototype Thumbnails
Building Prototype Modeling
Building Prototype Modeling
ROI Model (FA)
• Each building has a gprototype building sheet
• Input physical characteristics of “prototype building”prototype building
• Includes zoning and gdevelopment standards and other regulations or ginsurance issues
What can the ROI Model tell?• Financial
Feasibility– Zoning– Flood Protection
Strategy
S t i bilit• Sustainability• Plan Feasibility• Tax Revenue ofTax Revenue of
Plan• Transportation
NeedsNeeds• School Enrollment• Housing Suitability• Etc.
Closed Foundation with Vent Holes for FloodwatersElevated 8 Feet
Traditional Compact Residential – 1 Story
Elevated Foundation with Grade BeamsElevated 15 Feet
Traditional Compact Residential – 2 Stories
Elevated Foundation with Grade BeamsElevated 8 Feet
Waterfront Residential
Elevated Foundation with Grade BeamsElevated 15 Feet
Main Street Commercial – 1 Story
Open Foundation with Grade Beam Closed Foundation with Crawl SpaceOpen Foundation with Grade Beam Closed Foundation with Crawl SpaceElevated 15 feet Elevated 8 feet
Building Foundation Type Options
Source: FEMA Publication, Recommended Residential Construction for Coastal Areas, December 2009