Update on Nitrogen Water Quality Conditions in the South Florida Water Management District February 4, 2016 Stuart Van Horn, P.E. – Chief, Water Quality Bureau

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Purpose and Introduction November 2015 WRAC presentation focused on phosphorus water quality conditions 1. Comments on phosphorus slides resulted in refined presentation posted to WRAC Meetings website (11/5/15 Meeting Date) 2. Questions about nitrogen to and from Lake Okeechobee and in Estuary watersheds resulted in today’s presentation, including: • Average annual TN levels WY2011-2015 • Percent contribution of water and nitrogen from each sub-watershed relative to the watershed

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Total Nitrogen Conditions Northern Everglades Watersheds

Kissimmee and Lake Okeechobee Watershed

 Kissimmee / Lake Okeechobee

St Lucie River Watershed

• No TMDL for nitrogen

 St Lucie Estuary • TMDL Estuary TN Target: 0.72 mg/L • BMAP June 2013

 Caloosahatchee Estuary • TMDL Estuary TN Target: ~4,121 mtons (~9 million lbs) TN/yr • BMAP November 2012

Caloosahatchee River Watershed

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Northern Everglades Lake Okeechobee Inflow WY2011-WY2015 Nitrogen

UPPER KISSIMMEE 34% Water; 25% TN Load TN Load

TN FWMC

1,048 mt

1.16 ppm

Northern watershed contributes: ~ 91% of flow and ~ 87% TN load

LAKE ISTOKPOGA 13% Water; 13% TN Load TN Load

TN FWMC

530 mt

1.54 ppm

LOWER KISSIMMEE 16% Water; 13% TN Load TN Load

TN FWMC

554 mt

1.29 ppm

INDIAN PRAIRIE 13% Water; 18% TN Load TN Load

TN FWMC

728 mt

2.16 ppm

TC-NS 6% Water; 8% TN Load TN Load

TN FWMC

329 mt

1.94 ppm

FISHEATING CREEK

EAST LAKE O.

9% Water; 10% TN Load TN Load

TN FWMC

401 mt

1.71 ppm

4% Water; 5% TN Load Lake Okeechobee

WEST LAKE O. TN FWMC

89 mt

1.61 ppm

TN FWMC

198 mt

1.90 ppm

SOUTH LAKE O.

2% Water; 2% TN Load TN Load

TN Load

3% Water; 6% TN Load

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TN Load

TN FWMC

265 mt

3.80 ppm

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Northern Everglades St Lucie Estuary Inflow WY2011-WY2015 Nitrogen Local Basin Runoff accounted for about 79% of flow and 79% of TN load to Estuary. TEN MILE CREEK 10% Water; 8% TN Load TN Load

TN FWMC

96 mt

0.99 ppm

TIDAL BASINS (ESTIMATED) 31% Water; 22% TN Load

C-24 13% Water; 17% TN Load TN Load

TN FWMC

195 mt

1.62 ppm

TN Load

TN FWMC

257 mt

0.90 ppm

C-23 12% Water; 16% TN Load TN Load

TN FWMC

186 mt

1.66 ppm

LAKE OKEECHOBEE

C-44

21% Water; 21% TN Load

13% Water; 16% TN Load

TN Load

TN FWMC

249 mt

1.29 ppm

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TN Load

TN FWMC

191 mt

1.54 ppm

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Northern Everglades Caloosahatchee Estuary Inflows WY2011-15 Nitrogen Local Basin Runoff accounted for about 69% of flow and 68% of TN load to Estuary LAKE OKEECHOBEE TIDAL BASIN (ESTIMATED)

31% Water; 32% TN Load

21% Water; 20% TN Load TN Load

TN FWMC

568 mt

1.29 ppm

TN Load

TN FWMC

874 mt

1.36 ppm

C-43 AND S-4 BASINS TO ESTUARY 48% Water; 48% TN Load TN Load

TN FWMC

1,342 mt

1.35 ppm

Note: Coastal Basin runoff (west of Shell Point) is not included as Estuary contribution.

Discussion 7

Water Resources Update - South Florida Water Management District

Feb 4, 2016 - Meetings website (11/5/15 Meeting Date). 2. Questions about nitrogen to and from Lake. Okeechobee and in Estuary watersheds resulted in ...

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