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Reply To: Erratic EC response of Hydros 21 sensors

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2023-05-16 at 9:30 AM #17820
dan@wachusett
Participant

    Jim,

    I have seen similar fluctuations in some of the streams where I have Hydros21 sensors. Typically, step changes > 100 µS in 5 or 15 minutes only occur during runoff/snowmelt events. In the winter, after a snow event with road salt application and subsequent melt I have seen > 2,000 µS fluctuations in 15 minutes as the salt pulses work their way down the streams. In the non-snow season a rain event can quickly dilute the streams that have base flows with high conductivity, dropping very quickly in 15 minutes.

    If there is no active runoff/snowmelt I tend to see more stable conditions without such rapid fluctuations.

    -Dan