Observations by Bruce Sarty
Last updated Jan 8, 2021. Thx Bruce
EC (Electrical Conductivity) of four stream sites was monitored at approximately monthly intervals through 2019 and 2020, and continues.
A lake site was monitored on the same schedule beginning in 2020 and continues.
Results for the Lake, the Southern Inlet and the Northern Inlet in 2019 and 2020 are shown at right,
The Southern Inlet receives waters from several streams which merge at Murphy’s pit.
These streams drain settled areas in below and above Hammonds Plains Road and to the west in the vicinity of Gatehouse Run. The Northern Inlet receives water from Karen’s Brook (aka NW Brook) which drains a lightly settled area to the northwest of Sandy Lake.
Values for both inlets differed in absolute magnitude, but exhibited broadly similar seasonal patterns with distinct peaks in March and Oct of 2019 and July of 2020. The July peak suggests a significant portion of the salt is entering the streams via groundwater discharge (view Kelly et al., 2019). The lower lake values (top chart) in early winter months are likely associated with winter stratification/ice-melt, i.e. they are not representative of the lake as whole.
Original Field Observations
The Northern Inlet is “Karen’s Brook” in the table below. The Southern Inlet is Site 7.