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Freshwater Diversions and Louisiana The Davis Pond Project

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Title: Freshwater Diversions and Louisiana The Davis Pond Project


1
Freshwater Diversions and Louisiana The Davis
Pond Project
  • Dr. John W. Day
  • April 27, 2005

2
STAKEHOLDER PARTICIPATION IN RIVER DIVERSIONS
  • The Caernarvon Project
  • The Davis Pond Project

3
Caernarvon Diversion Structure - Flood 1992
(aerial view)
Ideally, wetland spatial maintenance occurs by
pulsed sediment delivery from rivers, which would
offset effects of RSLR, land subsidence, and
storm-induced erosion.
4
Caernarvon Freshwater Diversion
  • Construction completed 1991
  • Maximum Capacity 220 m3s-1
  • 1100 km2 of fresh to brackish wetlands

5
Caernarvon Freshwater Diversion
Discharge Canal
Mississippi River
6
Caernarvon Management Goals
  • Enhancement of emergent marsh vegetation growth
  • Reduction of marsh loss
  • Increase significant commercial and recreational
    fisheries productivity
  • Increase significant commercial and recreational
    wildlife productivity

Caernarvon Interagency Advisory Committee 1993
7
Hierarchical Information Flow
8
PULSES The importance of pulsed physical
events for watershed sustainability in coastal
Louisiana
Coastal Ecology Institute Louisiana State
University And Center for Ecology and
Environmental Technology University of Louisiana
at Lafayette
9
Targeted Approach to Environmental Problems
10
Caernarvon 1927
11
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12
River Flooding via Caernarvon Diversion
  • Discharge capacity is 227 m3/sec
  • (8000 cfs).
  • Normal operation is up to 113 m3/sec.
  • Our experimental pulses are
  • 14 and 184 m3/sec
  • (500 and 6500 cfs).

13
MODIS image of Diversion Flow
March 5, 2001
March 21, 2001
14
Low Flow (lt40 m3s-1)
High Flow (211 m3s-1)
S O N D J F M A M J J A S O N D J F M A M J J A
-- 2000 -- ---------------2001-------------
--------2002--------
15
Pulses Experimental Daily Discharge
Discharge (m3/s)
16
Marsh Processes
17
MODIS image of Diversion Flow
March 5, 2001
March 21, 2001
18
Sheet Flow Through Mass Balance
6700 cfs (100)
1800 cfs (27)
3240 cfs (48)
1630 cfs (24)
19
Accretion at Reference Area -Algal
Accretion at Site 432 -Mineral
20
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21
NitrateNitrite
0
Diversion
Distance from Diversion (km)
(?mol L-1)
Marine
50
200
Discharge (m3s-1)
0
F
W
S
S
F
W
S
S
22
Acknowledgements Caernarvon Interagency Advisory
Committee
  • Bruce Baird (USACE)
  • George Barisich (Shrimp)
  • Gerry Bodin (USFWS)
  • Clay Cosse (St. Bernard)
  • David Dawson (Land owner)
  • Heather Finley (LDWF)
  • Kenny Fox (Oysters)
  • Bill Good (LDNR)
  • Paul Gremillion (LDNR)
  • Jim Hasik (Recreational Fishing)
  • Bren Haase (NMFS)
  • Ken Hemphill (LDHH)
  • David Oge (LDEQ)
  • Jeanene Peckham (EPA)
  • John Scurish (Plaquemines)
  • Chuck Villarrubia (LDNR)

23
DAVIS POND
MISSISSIPPI RIVER
24
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25
Davis Pond Project Purposes
  • Reduce saltwater intrusion
  • Re-establish favorable salinities
  • Reduce the rate of land loss, and
  • Improve fish and wildlife habitat

26
  • Project Impacts
  • Provide an extra 15 million annually in
    fishing benefits and 300,000 for recreation
  • Save 33,000 acres of wetlands
  • Freshen 777,000 acres of marshes and bays

27
Davis Pond Freshwater Diversion Project
  • Features
  • Diversion Structure 10,650 cfs (4,800,000
    gpm) capacity
  • Diversion Channel 2.2 miles from river to
    ponding area
  • Pump Station 570 cfs (256,000
    gpm) capacity
  • Ponding Area 9,311 acres (14.5
    square miles)
  • Containment Levees 19 miles (channel
    ponding area)
  • Oyster leases Relocate if adversely
    impacted
  • Rock Weir 1.8 miles on Lake
    Cataouatches north shore (Ponding Areas
    outlet to Lake Cataouatche)
  • Cost and Schedule Cost (Federal
    State) 120,000,000 Annual Benefits
    15,295,000 Diversions to begin Summer
    2002

28
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29
New Orleans, LA
Davis Pond Freshwater Diversion
RIVER
LA HWY 18
Union Pacific RR
MISSISSIPPI
BN-SF RR
Luling, LA
U.S. HWY 90
Ponding Area
Willowdale
(9,300 acres)
Subdivision
LAKE CATAOUATCHE
30
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31
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32
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33
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34
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35
Davis Pond Project Concerns and Issues
  • Over Freshening
  • Flooding
  • Water Quality
  • Impacts on Fisheries
  • Others?

36
Davis Pond Diversion under construction
37
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38
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