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a peak flow of 80,000 m /d, an average flow of 50,000 m /d, and a mini, mum flow of 20,000 m /d. It is to be controlled using a Parshall flume. There should be a minimum of three channels operating at any time.

Assume a flow-through velocity of 0.3 m/s. The top width of the flow at maximum flow using three channels is 1.5 m. What is depth of flow corresponding to this condition?

5.17 In Problem 5.16, what is the top width during average flow for conditions operating at 4 channels?

5.18 In Problem 5.16, what is the depth during average flow for conditions operating at 4 channels? What is the value of the constant?

5.19 Assume Anne Arundel County wants to expand its softening plant. A sample from their existing softening tank is prepared and a settling column test is performed. The initial solids concentration in the column is 140 mg/L. The results are as follows:

Sampling Time (min)

Zp/Zo

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