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Ecologically Sustainable Water Management Defining the linkages between flows and ecosystems: Caddo Lake and its tribu

Ecologically Sustainable Water Management Defining the linkages between flows and ecosystems: Caddo Lake and its tributaries October 3, 2006 Jeff Opperman The Nature Conservancy. jopperman@tnc.org nature.org/freshwaters. Proportion of U.S. Species at Risk.

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Ecologically Sustainable Water Management Defining the linkages between flows and ecosystems: Caddo Lake and its tribu

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  1. Ecologically Sustainable Water Management Defining the linkages between flows and ecosystems: Caddo Lake and its tributaries October 3, 2006 Jeff Opperman The Nature Conservancy jopperman@tnc.org nature.org/freshwaters

  2. Proportion of U.S. Species at Risk

  3. Impaired Freshwater Biodiversity... Hydrologic Alteration …in addition to water quality, invasive species & direct habitat destruction

  4. Flow Regime (Master Variable) Physical Habitat Water Quality Connectivity Energy Supply Species Interactions Ecological Integrity & Ecosystem Services

  5. Ecologically Sustainable Water Management: developing flow recommendations

  6. Traditional Approach to Water Management E = ecosystem support H = human use From “Rivers for Life: Managing Water for People and Nature” by Sandra Postel and Brian Richter (Island Press 2003)

  7. A Sustainable Approach to Water Management E = ecosystem support H = human use From “Rivers for Life: Managing Water for People and Nature” by Sandra Postel and Brian Richter (Island Press 2003)

  8. ESWM Case Study: Lower Savannah River and Estuary

  9. Environmental Flow Recommendations Savannah River Really?... Monitoring, Research, & Adaptive Management Key Wet Year Avg Year Dry Year • 50,000-70,000 cfs; 2 weeks, avg every 2 yrs • Maintain channel habitats • Create floodplain topographic relief • Provide fish access to the floodplain • control invasive species • Maintain wetlands and fill oxbows and sloughs • Enhance nutrient cycling & improve water clarity • Disperse tree seeds Floods >30,000 cfs; 5 pulses, >2 days with 2 events of 2 week duration (March and early April) • 20,000-40,000 cfs; 2-3 days, 1/month • Provide predator-free habitat for birds • Disperse tree seeds • Transport fish larvae • Flush woody debris from floodplain to channel • Floodplain access for fish • Fish passage past NSBLD High Flow Pulses • <13,000 cfs; 3 successive years, every 10-20 years • Floodplain tree recruitment • 8,000-12,000 cfs; • Exchange water with oxbows Low Flows • >8,000 cfs • Larval drift for pelagic spawners • <5,000 cfs • Adequate floodplain drainage • Create shallow water habitat for small-bodied fish • 3,000 cfs; 3 successive years every 10-20 years • Floodplain tree recruitment JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC

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