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Table 1 Model parameters that contribute to the OEHI

From: A systematic approach for modelling quantitative lake ecosystem data to facilitate proactive urban lake management

Parameter (p) ANZECC guideline Observed values Health index mapping function HI =
Temperature (°C) 18 - 24 12 - 31 { g v , 18 , 5 v < 18 1 18 v 24 g v , 24 , 2 v > 24
pH 6.5 - 8 2 - 10 { g v , 6.5 , 1.3 v < 6.5 1 6.5 v 8 g v , 8 , 1.3 v > 8
Dissolved Oxygen (%) 90 - 110 0 -140 { g v , 100 , 38 v < 100 g v , 100 , 60 v 100
NTOT: Total Nitrogen (μg/L) 0 - 350 100 - 1000 { g v , 5 , 1.6 v < 5 1 5 v 350 g v , 350 , 300 v > 350
NOx: NO2 + NO3 (μg/L) 0 - 10 0 - 150 { g v , 1 , 0.3 v < 1 1 1 v 20 g v , 20 , 26 v > 20
NH3: Toxic Ammonia (μg/L) 0 - 10 0 - 90 { 1 v 10 g v , 10 , 9 v > 10
Total Phosphorus (μg/L) 0 - 10 0 - 150 { g v , 1 , 0.3 v < 1 1 1 v 20 g v , 20 , 26 v > 20
Filtered Reactive Phosphate (PO4) (μg/L) 0 - 5 0 - 100 { g v , 1 , 0.3 v < 1 1 1 v 15 g v , 15 , 26 v > 15
Chlorophyll-a (Chl-a) (μg/L) 0 - 5 0 - 70 { 1 v 8 g v , 8 , 18 v > 8
EC: Electrical Conductivity (μS/cm) Not Specific 0 - 200 { 1 v 100 g v , 100 , 300 v > 100
TSS: Total Suspended Solids (mg/L) Not Specific 0 - 150 { 1 v 20 g v , 20 , 25 v > 20
Turbidity (NTU) Not Specific 0 - 200 { 1 v 20 g v , 20 , 34 v > 20
Macroinvertebrates (Signal2, SWAMPS) N/A 3 - 5 v 1 9
Flora (Native, Non-weed) N/A 0.3 – 0.5 Equal to the Native and Non-weed ratios as defined in text.