Question

II. You are out toobing with friends on the Guadalupe this summer. A friend of yours has recently learned the term “flow rate”. He asks you to approximate the river flow rate right now. You estimate that the river is 300 feet across where you are, is approximately 5 feet deep in the center and gradually becomes shallower as you approach both banks to a depth of 0 ft. You also estimate your toob velocity of approximately 1.5 ft/sec.

1. What is the answer to your friend’s question in CFS (Cubic feet per/second)? Also, what do you explain to him are your assumptions behind this crude estimate?

b. Later, as you move down river in your toob, the velocity of the water increases to 3.0 ft/sec. What must have happened to the cross-sectional area of the stream if there were no additional sources of water flowing into or out of the river? Calculate the approximate change in this value given the continuity equation applies.

Answer 1

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