Question

The volume of water that a stream moves in a given amount of time is known as the stream's discharge In general, stream discharge will be velocity. 1 square 1 square meter Stream B Stream A Velocity: 30 meters/second Velocity: 10 meters/second Consider the above figure depicting a side view of the cross-section of two streams Each square represents one square meter (1 m) Think about which one would have greater discharge. (Develop a hypothesis.) Now let's test your hypothesis. Estimate the cross-sectional area for each stream You can use the boxes drawn over each stream as a guide What is the approximate cross-sectional area of stream A? square meters What is the approximate cross-sectional area of stream B? square meters 10 meters Now One second later If a stream with a cross-sectional area of 1 square meter moves at a velocity of 10 meters per second, then in 1 second water at the cross-section will have moved 10 meters downstream, with water from upstream continually filling in behind it Therefore, in one second, the stream will have moved a volume of water equal to 1 square meter times 10 meters . 10 cubic meters. In other words, it will have a discharge of 10 cubic meters per second Refer back to the first figure and notice the velocities given for each stream. Based on these velocities, what is the approximate discharge of each stream? Stream A cubic meters/second Stream B cubic meters/second How did this compare with what you thought initially? Imagine you have a third stream which flows at only 1 meter per second Approximately how large of a cross-sectional area would this stream have to be in order to have the same discharge as stream B? square meters The key point to see here is that stream discharge is controlled by two properties- cross-sectional area and velocity A slow-moving stream will have greater discharge than a faster stream A stream with small cross-sectional area will have greater discharge than a stream with large cross-sectional area cross-sectas of ร์ใ.wer Steam Cyoss ectiMal If the amount of rainfall entering a stream increases, then the stream's discharge would ร.potentially leadng to a Srpt ncllae increase OecreaSe

Answer 1

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