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Students from our school take measurements from twelve locations in Franklin County, all of them south of the stretch of river that is designated as a state scenic river. (See Places Tested button on navbar to left.)
When we sample the river, we perform several chemical tests, including dissolved oxygen, nitrates, sulfates, total alkalinity, pH, and electric conductivity. We also record some physical conditions such as: cloud cover and type, air temperature, wind direction and speed, and anything else that is noteworthy
that day. Physical conditions of the river are also described, including transparency (or turbidity) of the water and temperature. If enough people are present to time it, we have occasionally reported the flow rate. We also sample the macroinvertebrates, which are an indicaton of stream quality.

The twelve sites are sampled once each season, to see if human activity is altering the water quality differently at various times of the year. Sampling in Ohio is limited by weather conditions. For example, we try to sample at least 48 hours after a rainfall, and try to sample all 12 sites within 24 hours of each other. This is not always possible. It rained so often throughout an entire month this spring that we weren't able to sample all 12 sites. So, we collected samples from the lower 6 sites, understanding that some data were better than none for that season. There were times this spring when it rained too often for an entire month. If 48 hours had elapsed without rainfall, we began sampling at the southern edge of the range, even if the forecast called for rain again within 24 hours. Otherwise, there could be long stretches of time in the spring without any data.

We always sample from south to north, moving upstream. In this way, we are assured of capturing and testing H20 that hasn't been sampled yet.

Here's a clickable map of Franklin County that zooms:
http://209.51.193.83/s_county5.htm