7102-R4_LSLA_2020_SummerNewsletter_Web

2019 Summer Water Testing Notes

Secchi- Disk Readings June readings were low (meaning low visibility as the disk goes out of sight closer to the surface of the water as opposed to a high reading which allows the disk to be seen deeper into the lake) due most likely to high rain content leading to excess run off into the lake. This trend continued throughout the summer due most likely to algae effecting visibility. Overall, relatively lower than normal secchi readings were recorded throughout the 2019 season Temperature

Water temperature readings were slightly higher in 2019, as was the trend with the air temperatures as well. Peak was as normal in late July peaking at 26.7 C (82.22 F) about 1 degree above 2018, again, following the trend of 2019 with the air temperature. Oxygen O2 levels remained relatively higher than normal throughout the summer—which is good Summation The decrease in Secci readings combined with an increase in O2 levels is a clear indicator of increased algae as the algae produces oxygen as a process of photosynthesis Lake Environmental Association (LEA) is now studying winter algae and finding it does survive under the ice through the winter. LEA’s mission is to preserve and restore the exceptional water quality of Maine’s lakes, ponds, rivers, streams, and wetlands and the integrity of their watersheds Fall Recovery Trend The water temps the first 2 weeks of September had dropped dramatically by 4-5 degrees, as a result, the O2 levels rebounded at the lower depths as well. Future Plans with Water Testing The Little Sebago Lake Association is reviewing options to expand our water testing of our lake. On the radar are testing for Chlorophyll and Phosphorus which are major contributors to algae growth. In addition, we are looking into specific bacteria and proteins that promote both algae and produce toxins. We are also exploring options to complete some soil sample testing from different locations on each section of the lake floor to determine their content as it relates to algae growth as well We began the process over the winter and are in discussions with the staff at St. Josephs College, inclusive of a collaborative work-study program inclusive of testing and data collection. We are excited to continue these discussions with a program goal for the 2021 summer.

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