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Table S1. Summary of parameters, matrices, analytical methods and minimum detection limit (MDL) used for this study. Additional parameters were collected as part of the larger study (Reddy 2017) but not used in this study. All analytical methods are consistent with Florida Department of Environmental Protection or U.S. Environmental Protection Agency Standard Operating Procedures and methods. (DOCX 16 kb)

Figure S5. Stoichiometric relationships between total carbon (TC), total phosphorus (TP) and total nitrogen (TN) in soil ecosystem compartment for Stormwater Treatment Area 2, flow-ways (FWs) 1 and 3. Inflow, mid, outflow and overall standardized major axis (SMA) regressions indicated by lines through the data. Values can be converted to mass per volume (i.e. milligram per kilogram) concentration by multiplying each value by its respective conversion factor (C = 12.01; N = 14.00; P = 30.97). (DOCX 70 kb)

Figure S4. Stoichiometric relationships between total carbon (TC), total phosphorus (TP) and total nitrogen (TN) in floc ecosystem compartment for Stormwater Treatment Area 2, flow-ways (FWs) 1 and 3. Inflow, mid, outflow and overall standardized major axis (SMA) regressions indicated by lines through the data. Values can be converted to mass per volume (i.e. milligram per kilogram) concentration by multiplying each value by its respective conversion factor (C = 12.01; N = 14.00; P = 30.97). (DOCX 65 kb)

Figure S3. Cumulative distribution plots of hydraulic (left) and phosphorus (right) loading rates for flow-ways 1 and 2 (FW1 and FW2, respectively) for data collected between May 1st 2014 and April 30th 2018 (solid lines) relative to experiment flow period mean values (dashed values) for each flow-way. (DOCX 45 kb)

Figure S1. Effect of large concentration of carbon in area or mass on SMA regression. We assumed that the mass in a sample consists of C/0.45 + Z, where 0.45 is the concentration of C in biomass, and Z is material other than organics (minerals, water) on an area basis. The left figure assumes Z = 0, as it may occur in vegetation, where carbon and a nutrient (N) scale allometrically with a SMA slope of 0.8. The slope becomes zero if normalized on a per mass basis (note, we normalized the values so that they are identical at log(N) = 0). We then accounted for different amounts of non-organics (varying Z, bottom). Sufficient high Z lead to convergence of SMA slopes, but differences occur with decreasing Z, and become substantial for peat soils as analyzed in this study. (DOCX 60 kb)

Table S2. Event characteristics including duration, hydraulic and phosphorus loading rates (HLR and PLR, respectively) and median detection time of the five flow events for STA-2 flow-ways (FWs) 1 and 3. (DOCX 14 kb)

Figure S2. Hydrologic and Phosphorus loading rates (HLR and PLR, respectively) for the six flow events within flow-ways (FWs) 1 and 3 of Stormwater Treatment Area-2 between August 10th, 2015 and July 31st, 2017. (DOCX 120 kb)