Districtwide Status and Trends in Water Quality

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District-wide Status and Trends in Water Quality
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Monitoring Data
There are five types

• Ambient
• Operational
• Loading
• Event
• Experimental

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Ambient Data - Status and Trends
Status - 5 years (2000 through 2004). Trends
15 years (1990 through 2004) Trends tested
using non-parametric seasonal Mann-Kendall test
(plt0.10).
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Surface Water Basins
1. Nassau River (NRB) 2. St. Marys River
(SMRB) 3. Lower St. Johns River (LSJRB) 4. Lake
George (LG) 5. Middle St. Johns River (MSJRB) 6.
Upper St. Johns River (USJRB) 7. Ocklawaha River
(ORB) 8. Northern Coastal (NCB) 9. Indian River
Lagoon (IRL)
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Trophic State (Productivity)

• Total Nitrogen (TN) and Total Phosphorus (TP)
  regulate vegetation and phytoplankton (algae)
  growth as limiting nutrients
• Color, Turbidity, Total Suspended Solids (TSS)
  regulate vegetation and phytoplankton growth
  by affecting light intensity
• Chlorophyll a (Chl_a) indicates phytoplankton
  (algae) biomass and growth rate
• Total Organic Carbon (TOC) indicates overall
  productivity of the basin and water body

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Total Nitrogen Status (medians for 192 sites)
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Total Nitrogen Cumulative Frequency Distribution
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Total Nitrogen Trends (192 sites)
Percentage of Sampled Sites
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Increasing Total Nitrogen (16 sites)
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Total Phosphorus Status (medians for 192 sites)
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Total Phosphorus Cumulative Frequency
Distribution
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Total Phosphorus Trends (192 sites)
Percentage of Sampled Sites
20
49
13
18
Decreasing
Increasing
Insufficient
Stable
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Increasing Total Phosphorus (27 sites)
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TNTP Ratio
Indicator of Limiting Nutrient
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Color Status (medians for 192 sites)
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Color Status Cumulative Frequency Distribution
Color (PCU)
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Color Trends (192 sites)
Percentage of Sampled Sites
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Increasing Color (13 sites)
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Turbidity Status (medians for 192 sites)
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Turbidity Cumulative Frequency Distribution
Turbidity (NTU)
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Turbidity Trends (192 sites)
Percentage of Sampled Sites
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Increasing Turbidity (21 sites)
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Total Suspended Solids Status (medians for 192
sites)
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Total Suspended Solids Cumulative Frequency
Distribution
TSS (mg/L)
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Total Suspended Solids Trends (192 sites)
Percentage of Sampled Sites
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Increasing Total Suspended Solids (18 sites)
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Chlorophyll a Status (median values for 192
sites)
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Chlorophyll-a Cumulative Frequency Distribution
Chlorophyll a Uncorr. (?g/L)
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Chlorophyll a Trends (192 sites)
Percentage of Sampled Sites
27
49
3
19
2
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Sites with Increasing Trends of Chlorophyll a
(5 sites)
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Total Organic Carbon Status (median values for
192 sites)
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Total Organic Carbon Cumulative Frequency
Distribution
TOC (mg/L)
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Total Organic Carbon Trends (192 sites)
Percentage of Sampled Sites
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End