Chlorophyll-a Nuisance Level
Frequencies
Percent of Samples
During Growing Season Exceeding Various Nuisance-Level (or "Bloom")
Criteria, calculated from Observed or Predicted Mean Chlorophyll-a,
Assuming a Temporal CV of .62 and a Log-Normal Frequency
Distribution:
FREQ(CHL-a > 10 mg/m3)
% "Scums
Evident"
FREQ(CHL-a > 20 mg/m3)
% "Nuisance
Conditions"
FREQ(CHL-a > 30 mg/m3)
% "Severe Nuisance
Conditions"
FREQ(CHL-a > 40->60 mg/m3) % "Even
Worse"
Ref:
Walker, W., "Statistical Bases for Mean Chlorophyll-a Criteria" Lake
and Reservoir Management: Practical Applications, North American Lake
Management Society, Proceedings of Fourth Annual Conference, McAcfee, New
Jersey, October 1984.