Joyce Zhang. Lake Okeechobee Watershed Tributary Nutrient Loading Trends WY2006-WY2015. Principal Engineer Applied Sciences Bureau

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1 Lake Okeechobee Watershed Tributary Nutrient Loading Trends WY2006-WY2015 Joyce Zhang Principal Engineer Applied Sciences Bureau 2016 AWRA Annual Conference November 13-17, 2016

2 Lake Okeechobee Watershed 9 sub-watersheds 61 drainage basins 2

3 Lake Okeechobee is a regional multi-purpose water resource Water supply Flood protection Navigation Fishing Recreation Wildlife habitat

4 Lake Okeechobee Watershed History 1950s -Agricultural growth in the watershed 1960s- Watershed drainage and increased agricultural development Late 1960s-Walt Disney World established Kissimmee River C38 canal completed 2009 Land Use Area (acres) Percent Urban 392, % Agriculture 1,745, % Rangeland 206, % Upland Forests 251, % Water Bodies 224, % Wetlands 608, % Barren Land 21, % Watershed Total Acreage 3,450, %

5 Concerns over increased eutrophication High phosphorus loads in last 50 years Increased in lake total P Accumulation of P-rich sediments, algal blooms Solutions: enhanced source control, regional treatment, sediment management Concentration (ppb) Lakewater Total Phosphorus Year

6 Support and regulation from state and federal agencies Project Agency Soil Conservation and Rural Clean Waters Interim Action Plan Taylor Creek Headwaters Project Dairy Rule Dairy Buyout Works of the District Program Florida Watershed Restoration Act Lake Okeechobee TMDL Comprehensive Everglades Restoration Program (CERP) - Lake Okeechobee Watershed Project (LOWP) Lake Okeechobee Protection Plan (LOPP) and Northern Everglades and Estuary Restoration Program (NEEPP) Headwaters Restoration Program Basin Management and Action Plan (BMAP) U. S. Department of Agriculture South Florida Water Management District (SFWMD) Florida State Government Florida Department of Environmental Protection (FDEP) SFWMD SFWMD State FDEP US Army Corps of Engineers, SFWMD and Other Sponsors SFWMD, FDEP and Florida Department of Agriculture and Consumer Services (FDACS) U. S. Fish and Wildlife Service FDEP and Coordinating Agencies

7 7

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9 Nutrient Load and Discharge Trend for Tributaries of Lake Okeechobee Objectives Conduct statistical analysis for the 14 longterm tributary loading stations Define trends in flow, loads (both TP and TN), and flow-weighted mean concentrations (FWMC) Summarize results and make recommendations

10 Nutrient Load and Discharge Trend for Tributaries of Lake Okeechobee Methods Monthly values from WY2006 to WY2015 Summary statistics: mean, median, maximum, minimum, and standard deviation Seasonal Kendall s Tau test Statistically significant with p-value < 0.05 Trends of five parameters: flow, TP load, TP FWMC, TN load, and TN FWMC

11 Flow (ac-ft X10 3 ) TP Load (t)

12 Flow (ac-ft X10 3 ) TN Load (t)

13 TP Flow-weighted Mean Concentration (μg/l) TN Flow-weighted Mean Concentration (mg/l)

14 Summary statistics of flow, total phosphorus, and total nitrogen data OKUSGS No./Site Name Station Description Parameter Mean Annual Summary Statistics Standard Minimum Median Maximum Deviation Fisheating Creek at Lake Placid Fisheating Creek at Palmdale Arbuckle Creek infow to Lake Istokpoga Flow (ac-ft x 10 3 ) TP Load (mt) TP fwmc (μg/l) TN Loads (mt) TN fwmc (mg/l) Flow (ac-ft x 10 3 ) TP Load (mt) TP fwmc (μg/l) TN Loads (mt) TN fwmc (mg/l) Flow (ac-ft x 10 3 ) TP Load (mt) TP fwmc (μg/l) TN Loads (mt) TN fwmc (mg/l)

15 Seasonal Kendall Tau trend analysis results for stations with increasing trends in one or more parameters. Bolded parameters indicate significant changes. Station Parameter (unit) Number of Months of Data Sen Slope (Trend) Intercept Significant Flow (ac-ft x 10 3 ) No TP Load (mt) Yes TP FWMC (μg/l) No TN Load (mt) No TN FWMC (mg/l) No Flow (ac-ft x 10 3 ) No TP Load (mt) No TP FWMC (μg/l) Yes TN Load (mt) No TN FWMC (mg/l) No Flow (ac-ft x 10 3 ) Yes TP Load (mt) No TP FWMC (μg/l) No TN Load (mt) No TN FWMC (mg/l) No ( f 3 ) 15

16 Seasonal Kendall Tau trend analysis results for stations with increasing trends in one or more parameters. Bolded parameters indicate significant changes (Continued). Station Parameter (unit) Number of Sen Slope Months of (Trend) Data Intercept Significant Flow (ac-ft x 10 3 ) Yes TP Load (mt) No TP FWMC (μg/l) No TN Load (mt) No TN FWMC (mg/l) No Flow (ac-ft x 10 3 ) No TP Load (mt) Yes TP FWMC (μg/l) Yes TN Load (mt) No TN FWMC (mg/l) No Flow (ac-ft x 10 3 ) Yes TP Load (mt) Yes TP FWMC (μg/l) No TN Load (mt) Yes TN FWMC (mg/l) No 16

17 17

18 Station Sen = 0.004, Int = τ = 0.146, p = Station Sen = 0.047, Int = τ = 0.144, p = Total Monthly Flow (ac-ft x 10 3 ) Station Sen = 0.004, Int= τ = 0.235, p =

19 19

20 Total Monthly TP Load (mt) Station Sen = 0.011, Int = τ = 0.259, p < Station Sen = 0.001, Int = τ = 0.276, p < Station Sen = 0.006, Int = τ = 0.144, p =

21 21

22 Monthly TP FWMC (μg/l) 1200 Station Sen = 20.2 Int = τ = 0.292, p = Station Sen = 31.2 Int = 212 τ = 0.389, p =

23 23

24 Total Monthly TN Load (mt) Station Sen = 0.004, Int = τ = 0.207, p =

25 Summary and Recommendation Flow - Increase at three stations TP load - Increase at three stations TP concentration - Increase at two stations TN Load - Increase at one station TN concentration - No trend

26 Summary and Recommendation (cont.) No decreasing trend was found for any parameters Further analysis of upstream land use or hydrological changes that may have affected nutrient loadings is recommended Additional analysis of basin level trends should be compared with the upstream tributary loading analysis

27 THANK YOU! Joyce Zhang Principal Engineer Applied Sciences Bureau

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