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Water Pressure: Column Height vs. Volume

1:39
2:11
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At 1:39 in

Learn about hydrostatic pressure, forms and your basement. #learn #concrete #basement #formwork

What happens here

Returning to the PVC pipe setup, the presenter demonstrates that water pressure is determined by the column height, not the volume of water. Two pipes of different diameters, but with water at the same height, are shown. When holes are opened at the same height, both emit streams with equal initial pressure, although the larger pipe maintains its stream for a longer duration due to its greater volume.

Goal: Clarify that water pressure is dependent on height, not volume, while volume affects flow duration.

Tools and materials

  • Large PVC pipe — Simulating a water column with larger volume
  • Small PVC pipe — Simulating a water column with smaller volume
  • Water N/A — Filling the PVC pipes

What they say

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away. Let's demonstrate what happens when you get too much soil pressure. Water pressure is determined by column height, not by volume. A smaller tube will push out as much water as a bigger tube, but the bigger tube can keep the stream longer. Same size hole and same column height of water. As you see the small tube dies faster and this has more continual pressure. So, just because you have wider forms does not mean that you have more

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