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Lake Pontchartrain Water Quality Monitoring March – May 2008 Bonnet Carre Spillway Opening

Lake Pontchartrain Water Quality Monitoring March – May 2008 Bonnet Carre Spillway Opening. Andrea Bourgeois-Calvin Program Coordinator Bonnet Carre Workshop June 13, 2008. LPBF Basin-wide Water Quality Monitoring Program. Began January 2001 Three Objectives

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Lake Pontchartrain Water Quality Monitoring March – May 2008 Bonnet Carre Spillway Opening

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  1. Lake Pontchartrain Water Quality Monitoring March – May 2008Bonnet Carre Spillway Opening Andrea Bourgeois-Calvin Program Coordinator Bonnet Carre Workshop June 13, 2008

  2. LPBF Basin-wide Water Quality Monitoring Program Began January 2001 Three Objectives  Distribute water quality information to the public  Identify pollution sources  Provide data to research community and government agencies at all levels

  3. Monitoring Sites and Parameters • Monitor recreation sites around Lake Pontchartrain Basin for • * Water Temperature • * Dissolved Oxygen • * Specific Conductance • * Salinity • * pH • * Turbidity • * Fecal Coliform • * Enterococci • Data released to media

  4. Spillway Time-Line • Spillway opened on April 11, 2008 • Spillway closed April 30 – May 8, 2008 • Algae blooms first sited- mid-May in Lake Maurepas, Pass Manchac, and off Tchefuncte River. Tchefuncte River, May 26, 2008 Lewisberg, May 19, 2008

  5. Data: Southshore Sites, March – May 2008

  6. Plume corresponds to data

  7. Data: Northshore Sites, March – May 2008

  8. Algae bloom corresponds to data

  9. Conclusions Salinity • Immediate and sustained drop in salinity on southshore • Later drop in salinity on northshore Fecal Coliform • Fecal coliform levels remained consistent on both shores Turbidity • Turbidity spiked on southshore with opening of spillway • Turbidity spiked on northshore with winds blowing from south and beginning of algae blooms in mid-May Dissolved Oxygen • Dissolved oxygen levels consistently high on southshore • Dissolved oxygen levels decreasing on northshore with growth of algae blooms (since mid-May and continuing to current)

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