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

3. predict the permeability of gravel

4. Gravel Very high permeability

5. predict the permeability of sand

6. Sand High permeability

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

8. Predict the permeability of silt

9. Silt Low permeability

10. Predict the permeability of clay

11. Clay Very low permeability

12. Cement

13. Impermeable

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

17. Let’s see how permeability affects our daily life.

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

20. Suburban areas

21. Forest

22. 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.