Routine Operations | Trigger/action levels | Follow-up |
Routine patrol at reservoirs | Algal scums/blooms observed | Collect samples for microscopic examination, Chl a testing and toxin test; physical removal of algal scums in water |
Routine monitoring of chlorophyll-a and algae counts in reservoirs | Chl a exceeds 50 μg/L and sample dominated by potential toxin producing cyanobacteria, or Microcystis count exceeds 5000 cells/ml | Conduct toxin analysis, management of reservoir water quality by improving the turnover (dilution with alternative source of water and ensure there is no de-stratification) |
Routine monitoring of toxins at reservoirs | MC-LR in raw and treated water exceed guideline level of 1 μg/L for drinking water | Increase toxin monitoring in source and treated water, enhance the water treatment process by introducing PAC or ozone. Utilise alternative reservoir source supply. |