the impact of sea level rise on urban infrastructure
TRANSCRIPT
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The Impact of Sea Level Rise on Urban Infrastructure
Frederick Bloetscher, Ph.D., P.E., DWRE Florida Atlantic University
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Risks of Climate Change • Changes in the amount of rainfall • Change in rainfall timing • Sea Level rise
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Sea Level Rise Atlantic Coast
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The Problem is Time and
Creep
1 ft – 20 to 40 years
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The Problem is Time and
Creep
2 ft – 30 to 70 years
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The Problem is Time and Creep
3 ft – 50 to 150 years, but – too
late?
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Then Climate Change… Problem
There is no soil storage – So flooding occurs east of dike, west of I-95
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Consequences… • Saltwater Intrusion may be offset with GW rise • Flooding during storms, mostly because GW rise =
Loss of soil storage capacity • Hurricane frequency uncertain, but 3 ft SLR is a
problem
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What it Really Looks like
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Reality – roads underwater
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Broward County at 0, 1, 2, 3
ft SLR
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Miami-Dade County at 0, 1, 2, 3
ft SLR
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Compare with Bathtub Model
Percent increase from bathtub model Model Current 1ft 2ft 3ft
April 50th % 36 38 41 40 Oct. 50th% 78 83 92 85
Oct. 100th % 154 233 182 138
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Difference in Inundation
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Message • Timeline for change
• No regret policy • Costs at appropriate time
• At Risk Infrastructure • Water • Sewer • Stormwater • Transportation
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What to do?
• Protect infrastructure from the impacts of Climate changes
• Adapt to the changes • Retreat from the change (worst case?)
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Options to Adapt
• Install more coastal salinity structures • Raise road beds • Abandon certain roads • Increase stormwater pumping • Added stormwater retention • Wellpoints/dewatering (permanent pumping
systems)
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Roadways at Risk Asphalt Base Subbase Drainage Water table – current minimum is 2 ft NGVD (high tide)
Current Base Condition for Low lying Roads
Asphalt Base Subbase Drainage Water table – future minimum is 5 ft NGVD (high tide)
Future Condition for Low lying Roads
Roadway Elevation 8-10 ft
Roadway Elevation 8-10 ft
Base saturation = Failure
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Sealing the Sewers!!! (G7 Program)
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Flood control system can backup
(Obeysekera, SFWMD, 2009)
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Coastal structures will lose capacity as sea level rises
S-13 Pumping Station •Capacity = 540 cfs =14.5 million gal/hr
Based on data from Obeysekera, SFWMD, 2009 and Heimlich et al., FAU, 2009
2000 2020 2030 2040 2050 2060 2070 2080
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Install Pumping Stations In Low Lying Areas To Reduce Storm Water Flooding
(for illustration only – study required)
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Add Salinity/lock structures
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25
Tides vs Water Levels
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Dry zone
Vadose zonedrawdown cone
Productive Limestone Layer well
Confining Unit
Figure 1 – Normal drawdown for vertical well
Figure 2 – much smaller drawdown with horizontal wells
Moving Wellfields/ horizontal
wells
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Too Much Water…
COASTAL RIDGE (10’)
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Multi-Barrier System • Conventional
treatment • Media filtration with
chlorine disinfection • Advanced treatment Microfiltration (MF) Reverse osmosis
(RO) Ultraviolet advanced
oxidation (UVAOP)
Reclaim Some of It?
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Post Treatment Stabilization • pH • Hardness • Mineral Content • DO • ORP
Stabilization Techniques • Sodium hydroxide • Hydrated lime • Limestone filter • Kiln dust • Sodium metabisulfate
Pilot
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Alternative Water Supply Evaluation
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Or Recover More Water
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Juswin Working on New Graphic
Cartridge Filtration
NF/RO Cleaning System
Nanofiltration (Stages 1 & 2)
Reverse Osmosis
Site spatial constraints combined nanofiltration third stage and reverse osmosis fourth stage on one skid
Innovative Four-Stage NF/RO Process
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Requires a Dedicated Design and Construction Team
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Awards
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• We are unlikely to stop climate change anytime soon
• We need to adapt to the changes • We will have more water • We will need to manage it better • The adaptation will critically alter the current
built and natural environments • Those “crazy” ideas may be the norm
Conclusions About Climate and Water
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Questions?