If water can pass through a surface, the surface is permeable.

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Presentation transcript:

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

Sand High permeability

If water cannot pass through a surface, the surface is impermeable.

Predict the permeability of silt

Silt Low permeability

Predict the permeability of clay

Clay Very low permeability

Cement

Impermeable

Run-off: Water that does not soak into the ground or evaporate, but instead flows across the land

Let’s see how permeability affects our daily life.

Do you think the surfaces in urban areas permeable or impermeable?

Suburban areas

Forest

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.