Lab_4-write up - What is the relationship between flow and...

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What is the relationship between flow and turbidity in the Red Cedar River? Introduction: It doesn’t take a genius to notice that the Red Cedar isn’t exactly pristine. There is a noticeable level of murk to the water, that one can assume is comprised of mud and silt and various other particles of debris. We have shown that the amount of particles in a body of water have a direct effect on light attenuation and euphotic zones. The amount of particles suspended in a body of water is referred to as turbidity. The particles measured in turbidity are less than or equal to one µm in size. Turbidity is most often measured in g/L. So with turbidity being the relative amount the more particles suspended, the more turbid the body of water. The Red Cedar is accordingly, a very turbid river. In this lab we examined just how turbid a body of water the Red Cedar in fact is. Analyzing the turbidity of such a river brings with it useful data from which we can make several hypotheses and observe in general the effects of rain on the clarity of a body of such a river. Such information is useful for anyone interested in whether or not a body of water is a suitable habitat for aquatic life. From measuring the turbidity of the river, we gain knowledge of the amount of particles in a representative sample From this sample, and with the knowledge of the depth, width, and velocity of the river, we can determine the amount of particles passing through a plane cross- section of the river at a given time. Such a measurement is referred to as load . Load is measured in g/s, and was calculated by multiplying the turbidity by the discharge, multiplied by 1000. Remember from the previous lab that discharge is the volume of water passing a plane of the river at a given point in time, measured in (m³/s). Calculating load is particularly important when considering the health of the watershed into which the river empties, whether it be a lake or basin. The well being of the watershed can be greatly affected by the amount of particles and sediment being emptied into it and with what velocity. This rapid intake of particles and sediment could cause a lake or other watershed to sustain a large decrease in water clarity, or in other words, a great increase in turbidity. In observing and dissecting the equations themselves, we predict a direct, linear
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This note was uploaded on 04/12/2008 for the course ISP 217 Lab taught by Professor Peters during the Fall '07 term at Michigan State University.

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Lab_4-write up - What is the relationship between flow and...

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