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Hurricanes Katrina and Rita: Pathogens in Floodwaters Public Health Implications. Edward Laws Louisiana State University School of the Coast and Environment November 23, 22005 Thanks to: Rob Cunningham, RS/GIS Coordinator, Natural Systems Modeling Group, SC&E

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hurricanes katrina and rita pathogens in floodwaters public health implications

Hurricanes Katrina and Rita:Pathogens in FloodwatersPublic Health Implications

Edward Laws

Louisiana State University

School of the Coast and Environment

November 23, 22005

Thanks to:

Rob Cunningham, RS/GIS Coordinator, Natural Systems Modeling Group, SC&E

DeWitt Braud, Coastal Studies Institute, SC&E

Elaine Evers, Coastal Ecology Institute, SC&E

Paul Kemp, Director, Natural Systems Modeling Group, SC&E

Nan Walker, Earth Scan Laboratory, SC&E

slide3

Vertical

Temperature

Structure

Loop Current

slide9

10 meter SPOT Satellite Image: 2 Sep 05

With Water depth overlays

London Ave Canal Breaks

17th Street canal break

Industrial Canal Overwash

slide18

1 meter IKONOS satellite image:

2 Sep 05

Lakeview 17th St Canal Breach

slide30

Hurricane Katrina Response: Microbes and HABs

NSF SGER Rapid Funding Mechanism Collaborative & Interdisciplinary (>$600,000 total)

  • Hawaii NSF NIEHS OHH Center (Steward)
  • University of Miami NSF NIEHS OHH Center (Solo Gabriele)
  • WHOI NSF NIEHS OHH Center (Gast)
  • Louisiana State University (Hou)
slide31

Hurricane Katrina Response: Microbes and HABs

Using Remote Sensing, targeted sampling of Lake Pontchartrain and Canals for:

  • Microbes
    • indicator organisms (E coli, Enterococcus)
    • Pathogenic bacteria (Cholera, Vibrio, Staph, Bacteroides)
    • Viruses (Enterovirus, Norovirus, Coliphage)
    • Protozoa (Cryptosporidium, Giardia)
  • HABs
    • Cyanobacteria
  • Heavy metals and Hydrocarbons
  • Environmental parameters
slide34

E. Coli and enterococci concentrations in canal water samples

Enterococci concentrations (CFU/100 ml)

E. coli concentrations (CFU/100 ml)

60000

1600

1400

50000

1200

40000

1000

(CFU/100ml)

Enterococci (CFU/100ml)

30000

800

S3

S3

E coli

600

S1

20000

S1

400

10000

200

0

0

0

0

7

S1

7

19

S1

19

28

28

31

S3

31

40

S3

40

45

45

Days

54

Days

54

slide36

Transect 1 over time

control

80000

S4

60000

S3

S2

E coli (CFU/100 ml)

40000

S1

20000

0

0

10

23

38

Days

Transect 1: E. coli per 100 ml

slide37

Transect 1 over time

control

200

S4

150

S3

Enterococci (CFU/100 ml)

100

S2

50

S1

0

0

10

23

38

day

Transect 1: Enterococcus per 100 ml

comments and conclusions

Comments and Conclusions

The dewatering of New Orleans was completed much faster than initially predicted.

Concentrations of indicator bacteria in canals and Lake Pontchartrain declined to background levels on a timeframe of 1-2 weeks.

Impact of discharged floodwaters on Lake Pontchartrain was detectable only within a few kilometers of the shoreline.