ELI5: How is the length of the runoff/end of the water slide determined?

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How is the length of the runoff/end of the water slide determined?

So in my mind there would be an optimum length for the end of a water slide to stop a human.

But then when you add a body of semi stationary water that would add resistance, reducing the distance required to slow a human to a stop.

So what would be the calculation?

The slide that peaked my interest is a single person waterslide sort of like a spiral with a 10m horizontal section at the end for riders to alight from the slide.

Wish I could attach a picture of it.

Comments

  1. ASDFzxcvTaken Avatar

    Throw away the calculator and use the seat of your pants.

  2. vha23 Avatar

    Trial and error. 

    Get a bag weighing 20 lbs.  and one that’s 300 lbs.  observe how they respond.  Make longer as needed.