Clarification 9
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Is a small capture velocity better than a larger capture velocity?
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When water enters the plate settlers, it 
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Is the particle always trying to settle?
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Does the particle move relative to the water?
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There are a lot of velocities in this video! A macroscale example similar (but not exact for several reasons) to what is happening here is that you (a particle) are moving down an up escalator. The escalator (upflow) wants to carry you upward but you (a particle) are moving downwards (at a fixed speed). If your speed is greater than the upflow velocity then you will eventually make it to the bottom, but remember that you are always being pushed up! If you are moving the same speed at the upflow you will be static on the escalator but the escalator will move a distance of velocity*time around you. If you are faster than the escalator, it will still move a distance of velocity*time around you, but you will also have moved (a distance of Hc at speed Vt because you are moving at one speed). Your net speed is based on the difference of your speed and the escalators speed. With both you and a particle the failure mode if if you/the particle end up at the top of the escalator when you/the particle started at the bottom. 

In this example, what is H equivalent to?
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What are the failure modes when your plate settlers are angled to 0 degrees or 90 degrees
Tell me your questions, I know you have them after this video
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