Thursday 21 September 2017

Benthic McGee Creek Tue-Wed Sept 19-20, 2017

Hydra is a constellation! So finding an astronomer or two, knee-deep in water, ought not to be so outrageous? Well, maybe ...

This is our site looking upstream/east on the Tuesday when we measured the water quality. Here are some details to the right and left of the central rill/current:

Note the material hanging from the fence across the creek - there was some during the Spring runoff but most was caught in June when a beaver built a dam some 5m downstream from where I was standing. The water level reached 70cm or so then. The dam was subsequently removed and the water depth on Tues was 23cm under the bridge after 12 hours of rain. Nevertheless, there has been a marked reduction in current and an increase in sediments.

After we collected our sample, I noted that the water stayed turbid for at least 10minutes afterwards. Last year the clouds would have cleared - been swept away - in 1-2 minutes. Last year the current was about 1m in 6 seconds, this year more than a minute, 10 times slower, even though there is not much left of the dam, just friction.


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