Large Scale Lake Planning
Phosphorus (P) budget analysis of the 2007 summer limnological data set confirmed that internal P loading, primarily from anaerobic sediments located in the north basin, is the dominant P source driving algal blooms in Big Chetac Lake. Empirical steady-state models predicted that management of internal P loading in the north basin would result in a 47% decrease in mean summer total P concentrations to 0.045 mg/L. Predicted chlorophyll concentrations declined by 60% to 21 μg/L and frequency of nuisance algal blooms (i.e., chlorophyll concentrations > 30 μg/L) decreased from 73% to only 19% of the time during the summer. In contrast, management and reduction of tributary P loads resulted in minor predicted improvements in limnological characteristics because these inputs were low relative to P inputs via internal loads.
Big Chetac Chain Lakes Association is sponsoring a project to assess the feasibility of an alum treatment for Big Chetac Lake.
The final deliverables include a final report documenting the results of the regulations review, sediment cores, alum dosage analysis, and lake response modeling.
Lakes Planning Grant
Alum Feasibility Study
Monitor Water Quality or Sediment
Water Quality Modeling