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Table 1

Simulated hypothetical maximum concentrations in (A) the tributaries to Lake Vombsjön and (B) at the water intake in Lake Vombsjön as a result of inflows from the tributaries

Pathogen/Tributary(A) Concentrations in the tributariesa
(B) Concentrations at the water intakeb
BjörkaånTorpsbäckenBorstbäckenBjörkaånTorpsbäckenBorstbäcken
Salmonella (# L−1
 FertMed 0.06 0.19 0.15 0.000084 0.000024 0.0000094 
 FertHigh 0.14 0.45 0.36 0.000200 0.000055 0.0000220 
 GrazMed 0.08 0.22 0.20 0.000077 0.000014 0.0000073 
 GrazHigh 0.18 0.52 0.46 0.000180 0.000032 0.0000170 
VTEC (# L−1
 FertMed 83 261 209 0.11 0.032 0.013 
 FertHigh 147 460 369 0.20 0.056 0.022 
 GrazMed 107 300 266 0.10 0.019 0.010 
 GrazHigh 188 529 470 0.18 0.033 0.018 
C. parvum (# L−1
 FertMed 60 75 60 0.28 0.028 0.010 
 FertHigh 120 148 119 0.54 0.055 0.020 
 GrazMed 122 108 96 0.96 0.058 0.021 
 GrazHigh 241 213 190 1.91 0.114 0.041 
Pathogen/Tributary(A) Concentrations in the tributariesa
(B) Concentrations at the water intakeb
BjörkaånTorpsbäckenBorstbäckenBjörkaånTorpsbäckenBorstbäcken
Salmonella (# L−1
 FertMed 0.06 0.19 0.15 0.000084 0.000024 0.0000094 
 FertHigh 0.14 0.45 0.36 0.000200 0.000055 0.0000220 
 GrazMed 0.08 0.22 0.20 0.000077 0.000014 0.0000073 
 GrazHigh 0.18 0.52 0.46 0.000180 0.000032 0.0000170 
VTEC (# L−1
 FertMed 83 261 209 0.11 0.032 0.013 
 FertHigh 147 460 369 0.20 0.056 0.022 
 GrazMed 107 300 266 0.10 0.019 0.010 
 GrazHigh 188 529 470 0.18 0.033 0.018 
C. parvum (# L−1
 FertMed 60 75 60 0.28 0.028 0.010 
 FertHigh 120 148 119 0.54 0.055 0.020 
 GrazMed 122 108 96 0.96 0.058 0.021 
 GrazHigh 241 213 190 1.91 0.114 0.041 

‘FertMed’/‘GrazMed’: medium within-herd prevalence, ‘FertHigh’/‘GrazHigh’: high within-herd prevalence.

aThe water flows and pathogen concentrations in the tributaries to Lake Vombsjön were simulated using hydrological modelling with HYPE.

bThe water circulation within Lake Vombsjön and pathogen concentrations at the water intake were simulated using hydrodynamic modelling with MIKE 3 FM based on the water flows and pathogen concentrations in the tributaries simulated using hydrological modelling with HYPE.

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