1 Water Quality Trends of the Kissimmee Water Quality Trends of the Kissimmee Chain of Lakes, Lake Istokpoga and Chain of Lakes, Lake Istokpoga and Lake Okeechobee Lake Okeechobee R. Thomas James, Brad Jones, Paul McCormick R. Thomas James, Brad Jones, Paul McCormick South Florida Water Management District South Florida Water Management District Clell Ford Clell Ford Highlands County, Florida Highlands County, Florida and and Karl Havens Karl Havens Florida Sea Grant Florida Sea Grant University of Florida University of Florida
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Water Quality Trends of the Kissimmee Chain of … Quality Trends of the Kissimmee Chain of Lakes, Lake Istokpoga and Lake Okeechobee ... Jan-81 Jan-83 Jan-85 Jan-87 Jan-89 Jan-91
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Water Quality Trends of the Kissimmee Water Quality Trends of the Kissimmee Chain of Lakes, Lake Istokpoga and Chain of Lakes, Lake Istokpoga and
Lake OkeechobeeLake Okeechobee
R. Thomas James, Brad Jones, Paul McCormickR. Thomas James, Brad Jones, Paul McCormickSouth Florida Water Management DistrictSouth Florida Water Management District
Clell FordClell FordHighlands County, FloridaHighlands County, Florida
andand
Karl HavensKarl HavensFlorida Sea GrantFlorida Sea Grant
University of FloridaUniversity of Florida
ObjectivesObjectivesEvaluate long term data for the Kissimmee Evaluate long term data for the Kissimmee Chain of Lakes, Lake Istokpoga, Lake Chain of Lakes, Lake Istokpoga, Lake OkeechobeeOkeechobeeDetermine if trends exist in Determine if trends exist in
NutrientsNutrientsTurbidity and TransparencyTurbidity and TransparencyChlorophyllChlorophyllConductivity and IonsConductivity and Ions
Determine relationships among lakesDetermine relationships among lakesLook for causalityLook for causality
WatershedWatershedDrainage Area 13,859 kmDrainage Area 13,859 km22
Headwaters of Kissimmee RiverHeadwaters of Kissimmee RiverSampling began in 1981Sampling began in 1981Lakes interconnected by canalsLakes interconnected by canalsWater Levels RegulatedWater Levels RegulatedHydrilla Increased through the Hydrilla Increased through the 1990s1990s
Chemical control has been Chemical control has been partially effectivepartially effectiveLakewide treatments in late 90sLakewide treatments in late 90sHurricanes and turbidity helped Hurricanes and turbidity helped to control in the 2000sto control in the 2000s
East Lake Tohopekaliga
Lake IstokpogaLake Istokpoga
Fifth largest Lake in Fifth largest Lake in FloridaFloridaSampled since 1988Sampled since 1988Outflow Structure built in Outflow Structure built in 19611961Waters regulated within a Waters regulated within a few feetfew feet
Lake OkeechobeeLake OkeechobeeLargest Lake In SoutheastLargest Lake In Southeast
1730 km1730 km22
ShallowShallow
Sampled since 1973Sampled since 1973Surrounded by Herbert Surrounded by Herbert Hoover DikeHoover DikeAll inflow and outflows All inflow and outflows except Fisheating Creek are except Fisheating Creek are regulatedregulated
SamplingSampling
Samples taken on a monthly basisSamples taken on a monthly basisWater samples analyzed for ions, nutrients Water samples analyzed for ions, nutrients and chlorophyll using standard methods and chlorophyll using standard methods Transparency measured with a Secchi Transparency measured with a Secchi Disk Disk
AnalysisAnalysis
KendallKendall’’s s TauTau analysis analysis GraphicsGraphics
TimelinesTimelinesFit with 2Fit with 2ndnd order polynomial curveorder polynomial curve
Significant Trends 1981 to 2007Significant Trends 1981 to 2007
Upper Chain of LakesUpper Chain of LakesLake Tohopekaliga had greatest trendsLake Tohopekaliga had greatest trends
Related to diversion of effluent from sewage Related to diversion of effluent from sewage treatment plant treatment plant Led to improvements downstreamLed to improvements downstream
Improvements reached a plateau in 1994Improvements reached a plateau in 1994HydrillaHydrillaIncreased population Increased population