Research Update BMP Workshop and Training April 24, 2019 Samira - PowerPoint PPT Presentation

Floating Aquatic Vegetation Impact on Farm Phosphorus Load: Research Update BMP Workshop and Training April 24, 2019 Samira Daroub Timothy Lang Andres Rodriguez Everglades Research and Education Center

Outline • Final Report Draft summary – Revised Draft Report – submitted to SFWMD March 2019 • Proposed Master Permit SOW2020-2025

FAV Project Update Methods 2501 0401 3103 3102 6117 1813 4702 4701

Hypothesis

Objective: • Determine impact of FAV suppression on P concentrations/ loads and Sediment properties. The two management practices Control: FAV cover is managed by the growers and is representative of typical FAV control practices in the region. Treatment: Aggressive control of FAV through spot spraying with approved aquatic herbicide as to keep farm canals at or below 25% vegetation coverage.

Farm Paired Design: Methods

Paired-Farm Comparison: Farm 4701/4702 b) 4701 (C) Percent FAV Coverage FAV % 25 % Cover 100 80 60 40 20 0 5/1/11 9/1/11 1/1/12 5/1/12 9/1/12 1/1/13 5/1/13 9/1/13 1/1/14 5/1/14 9/1/14 1/1/15 5/1/15 9/1/15 1/1/16 5/1/16 9/1/16 1/1/17 5/1/17 9/1/17 1/1/18 a) 4702 (T) Percent FAV Coverage FAV % 25 % Cover 100 Followed experimental 80 design (FAV coverage) 60 40 20 0

Paired-Farm Comparison: 4701/4702 Monthly UAD Monthly FWTP 0.50 0.25 0.45 Calibration Calibration Treatment 0.40 0.20 Treatment y = 0.1016x + 0.078 0.35 DRAINAGE 4702 (Mgal/A) FWTP 4702 (mg/L) R² = 0.0463 0.30 0.15 y = 0.5934x + 0.0313 y = 0.2066x + 0.0619 0.25 R² = 0.3592 R² = 0.0148 0.20 0.10 0.15 0.10 0.05 y = 0.2663x + 0.054 0.05 R² = 0.193 0.00 0.00 0.00 0.10 0.20 0.30 0.40 0.50 0.00 0.05 0.10 0.15 0.20 0.25 DRAINAGE 4701 (Mgal/A) FWTP 4701 (mg/L) Monthly UAL 0.14 Calibration 0.12 Treatment 0.10 UAL 4702 (kg/L) y = 1.1077x + 0.0054 R² = 0.5108 0.08 y = 0.3221x + 0.0149 R² = 0.2284 0.06 0.04 0.02 0.00 0.00 0.02 0.04 0.06 0.08 0.10 0.12 0.14 UAL 4701 (kg/L)

Sediment Properties • Total P in sediments was higher in 4701- high FAV growth • Bulk Density (BD) of sediments was higher in 4702 (T), meaning the generation of heavier sediments

Paired-Farm Comparison: 3102/3103 b) 3102 (C) Percent FAV Coverage FAV % 25 % Cover 100 80 60 40 20 0 a) 3103 (T) Percent FAV Coverage FAV % 25 % Cover 100 80 60 40 20 0

Paired-Farm Comparison: 3102/3103 Monthly UAD Monthly FWTP 0.80 0.70 Calibration 0.70 0.60 y = 1.1704x + 0.064 Treatment R² = 0.7441 0.60 0.50 DRAINAGE 3103 (Mgal/A) FWTP 3103 (mg/L) y = 0.6671x + 0.057 0.50 R² = 0.3336 y = 0.9141x + 0.0794 0.40 R² = 0.593 0.40 0.30 0.30 Calibration y = 0.4518x + 0.1328 Treatment 0.20 R² = 0.2882 0.20 0.10 0.10 0.00 0.00 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 DRAINAGE 3102 (Mgal/A) FWTP 3102 (mg/L) Monthly UAL 1.20 Calibration 1.00 Treatment y = 1.2393x + 0.0364 R² = 0.7898 UAL 3103 (kg/A) 0.80 0.60 y = 0.9208x + 0.0526 R² = 0.7477 0.40 0.20 0.00 0.00 0.20 0.40 0.60 0.80 1.00 1.20 UAL 3102 (kg/A)

P speciation: 3102/3103

Summary: • Drainage is often the dominant variable for UAL • Two farm pairs showed impact of controlling FAV • Each farm had site specific properties that influenced P concentrations and loads. • Recommendation is farm specific for impact of managing FAV on water quality.

Thank you! Questions?