A real life problem, just for fun

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The discussion revolves around an observed phenomenon in an "ant channel" where surface water movement indicated a potential leak, but it transitioned to a still surface abruptly. The interface between the moving and still water was noted to move at half the speed of the surface water. Participants are encouraged to explore explanations for this behavior, with hints suggesting a possible change in water depth. The inquiry remains open for further insights and guesses about the underlying physics. The conversation highlights the complexities of fluid dynamics in a controlled environment.
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Homework Statement



Around one of our buildings we have an "ant channel" of roughly square cross section (say 20 cm x 20 cm) with fish in it to control the mosquito larvae. The surface of the water carries particles giving a good indication of any surface movement.

Late one afternoon we observed the surface moving relatively quickly (say 3 cm/s). Suspecting a leak we followed the moving surface water and were amazed to find that the moving surface gave way abruptly to a still surface. Watching a little longer we observed that the interface between moving and still areas of the surface was itself moving -- at about half the velocity of the moving surface.

It appeared as if there was a discontinuity in the flow of water.

Homework Equations



None.

The Attempt at a Solution



I think I can explain the phenomenon. If no one gets it, I'll give clues.
 
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Hm. I'm not sure. But can I hazard a guess? There's a change in the depth of the water?
 

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