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If water can pass through a surface, the surface is permeable. predict the permeability of gravel. Gravel. Very high permeability. predict the permeability of sand. S and. High permeability. If water cannot pass through a surface, the surface is impermeable.
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If water can pass through a surface, the surface is permeable.
Gravel • Very high permeability
Sand • High permeability
If water cannot pass through a surface, the surface is impermeable.
Silt • Low permeability
Clay • Very low permeability
Cement • Impermeable
Run-off: Water that does not soak into the ground or evaporate, but instead flows across the land
Do you think the surfaces in urban areas permeable or impermeable?
Conclusions • 1. Different land cover affects water runoff during/after storms in different ways. • 2. Human habitation changes land cover • 3. Communities need to be careful about how land is used.