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| Collecting the bugs |
The high school Biology II class went out to do some follow up work on the two creeks they previously explored last fall. Along with collecting macroinvertebrates (bugs), they also learned how to calculate discharge. Discharge is the measure of how much water is going downstream in a stream or river and is measured in cubic feet/second, or cfs. The students measured the discharge using a method of using a half filled pop bottle for a float and timing how long it took to float over a measured distance. This gives the velocity of the stream which is then multiplied by the area of the stream which then gives you the cfs. The Environmental Services Dept. brought out their flow meter which provided a more precise measurement and allowed the students to compare the two methods of calculating discharge. The students also collected bugs again to compare to what they found last fall. The future BIO II classes will also be visiting these creeks again to start building a database of information to track changes in the environment.
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| Measuring the distance for the discharge measurement |
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| Measuring dissolved oxygen |
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| ESD staff measuring the discharge with the flow meter |
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| A dobson fly larvae and a dragonfly larvae |
