01 / 5 · Practical Engineering
Blue dye placed in the sand helps show the direction and speed of water movement below the surface.
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The dye traces show you how the groundwater moves over time.
I added dye tablets at a few spots so you can see the flow.
-Would you be willing to dye your hair black?
Instead of flowing all the way downstream, now some of the seepage flows up to and through the drain, and you can see this in the streamlines of dye flowing in the subsurface.
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