Virginia Barker Tony Janicki Steve Peene Harvey Harper Claudia Listopad Gordon England

Transcription

1 Refining TMDLs for the Indian River Lagoon Virginia Barker Tony Janicki Steve Peene Harvey Harper Claudia Listopad Gordon England

2 IRL Economic Fast Facts 2007 $1.2 B in economic benefits to Brevard 3,100 full and part time jobs in Brevard $112 M in State and local tax revenues

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4 Algal Blooms 2011 Algal Super Bloom (Unprecedented in magnitude and duration) 2011 Secondary Bloom 2012 Brown Tide 2013 Brown Tide Returns

5 Unusual Mortality Events Manatees Bottlenose Dolphins - 74 Deaths Brown Pelicans Florida Fish and Wildlife Conservation Commission (FWC) Assesses Wildlife Health

6 Major Nitrogen Sources in the IRL (Based on 2009 TMDL Report for the IRL) Point Sources 1% Atmospheric Deposition 19% Stormwater 80%

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10 IRL TMDL Update/Refinement Major Concerns Compounded conservativism load reductions too high Soil hydrologic groups Groundwater/base flow Air deposition changes Regression model simplicity Sea Level Rise

11 IRL TMDL Update/Refinement

12 Need for Updating the TMDL for the IRL TN Reductions versus Seagrass Lagoon Segment Load Reduction per TMDL Target-Compliant Years Seagrass Depth Target % TN % TP BR7 56% 69% 1.42 IR12 52% 48% x 1.39 IR % 48% x x x x 1.39 IR % 47% x x x x x 1.18 BR6 50% 68% x x x x 1.63 IR13 45% 46% x x x x x 1.35 BR1-2 42% 65% x x x x 1.75 IR 21 30% 44% x x x 1.52 BR3-5 28% 55% 1.57 IR % 46% x 1.81 IR4 24% 45% 1.57 IR5 22% 44% 1.72 IR1-3 21% 41% 1.6 IR6-7 21% 43% x 1.54 IR8 21% 44% 1.57

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14 Advancing Restoration of the IRL Working Groups Estimating Nutrient Loads TMDL Risk Assessment Refining the TMDL Air Deposition Fertilizer Ordinance Public Outreach FL Yards and Neighborhoods Muck Removal/Algae Harvesting Capital Improvement Partnerships Mapping Stormwater Assets Street Sweeping Monitoring

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16 IRL TMDL Update/Refinement Consortium The City of West Melbourne

17 Updating/Refining the TMDL for the IRL Purpose of the Study: Build local confidence in load reduction targets Build local confidence in the allocation of responsibility Method: Assemble a team of experts Use data collected through 2010 Increase temporal resolution and geo-spatial accuracy

18 TMDL REVISION STEPS Estimate monthly loads Identify resource of concern Set resource targets Define metric Define spatial extent Define reference period Define relationship of loads to resource Estimate TMDL

19 DEVELOPMENT OF TOTAL LOADS TN and TP Baseflow and Runoff Loads from SWIL Model Atmospheric Loads from rainfall distribution used in watershed model and local nitrogen and phosphorus deposition data Point Source loads from DMR data

20 SUB-LAGOONS

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28 TN LOAD DISTRIBUTION

29 TP LOAD DISTRIBUTION

30 MASS BALANCE ASSESSMENT Evaluated the system response to the loadings in terms of TN and TP sub-lagoon concentrations Simplified loadtransport model using EFDC transport Identified potential internal sources or sinks of nitrogen and phosphorus

31 MASS BALANCE

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40 TMDL REVISION STEPS Water Quality Chlorophyll Color Turbidity Water Clarity Impairment due to seagrass loss DEP dictated need to relate loads to seagrass LOADING SEAGRASS

41 TMDL REVISION STEPS Define metric Deep Edge Area IRL North IRL Central Banana River Deep Edge and Area are highly correlated Higher uncertainty with Deep Edge estimate Therefore, Area is recommended metric

42 TMDL REVISION STEPS Define spatial extent/segmentation

43 TMDL REVISION STEPS Define spatial extent DEP Estuarine Nutrient Regions with inclusion of Newfound Harbor and Sykes Creek Estuary in Banana River exclusion of Sebastian River

44 TMDL REVISION STEPS Define reference period

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48 TMDL REVISION STEPS Define reference period The recommended reference period is

49 Proposed Target

50 Proposed Target

51 Proposed Target

52 TMDL REVISION STEPS PROPOSED SEAGRASS TARGETS IRL North IRL Central Banana River 20,577 acres 8,708 acres 22,475 acres

53 TMDL REVISION STEPS Define relationship between loads and resource Seagrass Area Load

54 TMDL REVISION STEPS LOAD VS SEAGRASS REGRESSIONS Area - current annual loads Area previous annual loads Area 6, 12, 18, 24 month cumulative loads 6- month best fit Area 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 month cumulative loads - 5-month best fit 3-sublagoon model - Area 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 month cumulative loads - Loads normalized by sublagoon volume - seagrass area normalized to month best fit

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61 TN Loading Target= 3.09 lbs/acre-ft/7-months Seagrass Target = 8,827 acres

62 TP Loading Target= 0.38 lbs/acre-ft/7-months Seagrass Target = 8,827 acres

63 Comparison to DEP TMDL (January-May Loads) BRL DEP Current Study TN 85,000 lbs 114,000 lbs TP 7,000 lbs 10,000 lbs NIRL TN 197,000 lbs 226,000 lbs TP 16,000 lbs 21,000 lbs CIRL TN 253,000 lbs 384,000 lbs TP 43,000 lbs 47,000 lbs

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66 Next Steps Meet with DEP next week Finalize TMDL refinements Seek FDEP and EPA approval Implement through revised BMAPs Monitor success/adapt as needed

67 Annual vs. Jan-May Sources of TN Loading

68 Annual vs. Jan-May Sources of TP Loading

69 Scale of Landscape Nitrogen Loadings Based on Literature Values Average Atmospheric Deposition Loading for the IRL Average Loading for Properly Sited and Maintained Septic Systems Loading Allowed by Florida s State Model Fertilizer Ordinance Atmospheric Deposition Septic System Loadings Fertilizer Loading

70 Nitrogen Leaching from Fertilizer

71 Relative Nitrogen Leaching Based on Literature Values Following State Model Fertilizer Ordinance Atmospheric Deposition Drainfield Leaching Fertilizer Leaching Requiring 50% Slow Release Fertilizer

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76 Indian River Lagoon TMDL Revision QUESTIONS Presenters: Virginia Barker, Brevard County Tony Janicki, Janicki Environmental Steve Peene, ATM