Impact | Threshold | Requirements |
Hydraulic stress | Critical shear stress | 0.5 – 10 events per year |
NH3 toxicity | Critical
NH3 conc. for given duration t ( ccrit = 0.025 mg/l + 1.5 mg/l·min/t ) |
0.2 – 1 critical events per year |
Turbidity from TSS | Crit. TSS
conc. for given duration t |
depends on local cond. |
Colmation of riverbed from TSS | Crit. TSS density on river bottom: 625 g/m2 | < 20 % of time |
Accum. of toxic substances in riverbed | Crit. TSS density on river bottom: 25 g/m2 | < 5 % of time |
Oxygen depletion in riverbed | 5 g/m2 (16 g/m2) per day | < 10 % of time |