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ISCO
Auto-Sampler Event Graphs
- Dry Weather Events (baseline
sampling)
- Wet Weather Events (measuring
storm water runoff's effect on the creek)
The ISCO Auto-Sampler is stationed along Pitcher Street
near the Portage Creek outfall to the Kalamazoo River.
A level probe is secured at the creek bottom and records
levels on 10-minute intervals. Those level readings are
stored in the Auto-Sampler until they are downloaded by
field personnel and entered into a database. A relationship
has been developed to relate those levels to creek flow.
A rain gauge is also connected to the Auto-Sampler. It
records the date and time of bucket tips (when 1/100 of
an inch of precipitation fills the bucket), which can
be used to quantify the intensity of a rain event. The
Auto-Sampler stores twenty four 1-liter bottles, which
are used to collect creek samples according to a programmed
schedule. Dry weather samples are collected at certain
times of the day, in order to gauge the daily fluctuations
in pollutant levels and to assess the presence of illicit
connections in the watershed. Wet weather sample collection
is enabled by a rise in creek level or by a certain rain
intensity. |
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