Project Type | Total Nitrogen Removal Efficiency | Total Phosphorus Removal Efficiency | Source |
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Wet detention ponds | 8%-44%; formula: (43.75*detention time in days)/(4.38 + detention time in days) | 45%-75%; formula: 44.53+6.146*natural log for detention time in days+0.145*(natural log of detention time in days^2) | Draft Stormwater Treatment Applicant’s Handbook |
Off-line retention | 40%-84%; formula: 0.3178 * natural log of inches of retention + 0.8405 | 40%-84%; formula: 0.3178 * natural log of inches of retention + 0.8405 | Florida Department of Environmental Protection evaluation/regression of Harper and Baker 2007 |
On-line retention | 30%-74%; formula: 0.3178 * natural log of inches of retention + 0.7405 | 30%-74%; formula: 0.3178 * natural log of inches of retention + 0.7405 | Florida Department of Environmental Protection evaluation/regression of Harper and Baker 2007 |
Grass swales with swale blocks or raised culverts | Use on-line retention | Use on-line retention | Florida Department of Environmental Protection evaluation/regression of Harper and Baker 2007 |
Grass swales without swale blocks or raised culverts | Use 50% of on-line retention | Use 50% of on-line retention | Florida Department of Environmental Protection evaluation/regression of Harper and Baker 2007 |
Dry detention | 10% | 10% | Florida Department of Environmental Protection evaluation/regression of Harper and Baker 2007 |
2nd generation baffle box | 19.05% | 15.50% | Final Report Contract S0236 Effectiveness of Baffle Boxes |
2nd generation baffle box plus media filter | BMPTRAINS model | BMPTRAINS model | University of Central Florida Stormwater Management Academy BMPTRAINS model |
Stormwater reuse | Estimate annual load of stormwater (and percentage of total if not 100%) not discharged because used for irrigation | Estimate annual load of stormwater (and percentage of total if not 100%) not discharged because used for irrigation | Evaluated on case-by-case basis |
Alum injection | 50% | 90% | Harper et. al. 2007 |
Floating islands/managed aquatic plant systems | 20% | 20% | Chapter 14 Draft Stormwater Treatment Applicant’s Handbook |
Treatment trains | Treatment Train equation: Efficiency = Efficiency1 +((1-Efficiency1) *Efficiency2) or BMPTRAINS model | Treatment Train equation: Efficiency = Efficiency1 +((1-Efficiency1) *Efficiency2) or BMPTRAINS model | Draft Stormwater Treatment Applicant’s Handbook, March 2010; University of Central Florida Stormwater Management Academy BMPTRAINS model |
Denitrification walls | BMPTRAINS model | BMPTRAINS model | University of Central Florida Stormwater Management Academy BMPTRAINS model |
Permeable pavement | 30%-74% | 30%-74% | Harper et. al. 2007 |
Bioswales | 38%-89% | 9%-80% | Florida Department of Environmental Protection 2014 (minimum applies without other data) |
Green roofs | 45% (without cistern) or 60%-85% (with cistern) | Not applicable | University of Central Florida 2007 |
Bioretention basins/rain gardens | 30%-50% | 30%-90% | Florida Department of Environmental Protection 2014 (minimum applies without other data) |
Tree boxes | 38%-65% | 50%-80% | Florida Department of Environmental Protection 2014 (minimum applies without other data) |
Buffers | 22% (less than 40 meters wide) or 27% (greater than 40 meters wide) | Not applicable | Florida Department of Environmental Protection 2014 (minimum applies without other data) |
Biosorption activated media | 55% for January-May and 45% for rest of year or BMPTRAINS model | 65% or 45% for rest of year or BMPTRAINS model | Wanielista 2015 or University of Central Florida Stormwater Management Academy BMPTRAINS model |
Wastewater treatment facility upgrade to improve reclaimed water | Difference in loading (flow times concentration) before and after upgrade times a 75% attenuation factor | Difference in loading (flow times concentration) before and after upgrade times a 75% attenuation factor | Save Our Indian River Lagoon Project Plan |
Sewer lateral rehabilitation pilot | 160 pounds per year of total nitrogen reduced per 1,000 homes that make repairs or replacements | Not applicable | Based on estimates from Hurricane Irma overflows |
Rapid infiltration basin or sprayfield upgrade | 83% removal, applied to current load times a 60% attenuation factor | 66% removal, applied to current load times a 60% attenuation factor | City of DeLand and University of Central Florida 2018 |
Septic system removal by sewer extension or connection | ArcGIS-Based Nitrate Load Estimation Toolkit Model for Brevard County | Not applicable | Applied Ecology, Inc. |
Septic system upgrade | 50% | Not applicable | Florida Department of Health 2015 |
Muck removal | Area dredged (acre) times the muck flux rate of 150 pounds per acre per year times a 70% efficiency rate | Area dredged (acre) times the muck flux rate of 20 pounds per acre per year times a 70% efficiency rate | Trefry 2018 |
Treatment of muck interstitial water | Target of 3 milligrams per liter of total nitrogen in treated interstitial water | Target of 0.1 milligrams per liter of total phosphorus in treated interstitial water | Based on treatment technology |
Oyster reefs | Area (square feet) times the reduction rate of 0.04 pounds per year per square foot | Area (square feet) times the reduction rate of 0.001 pounds per year per square foot | Schmidt and Gallagher 2017; Kellogg et. al. 2013 |
Planted Shorelines | Length (feet) times the reduction rate of 0.067 pounds per feet per year | Length (feet) times the reduction rate of 0.023 pounds per feet per year | Forand et. al. 2014 with adjustments |
Vegetation Harvesting | Based on total mass of material collected, type of plant(s), and associated nutrient content in dry material | Based on total mass of material collected, type of plant(s), and associated nutrient content in dry material | Florida Department of Environmental Protection Statewide Best Management Practice (BMP) Efficiencies for Nonpoint Source Management of Surface Waters Draft – July 2018 |