What effect does pavement have on water?

Water cannot/is slower to be gradually soaked into it's soil in built environments with large unregulated soils, but rushes the environment, transporting toxins and ecological sewage into our rivers, killing fish, animals and possibly even us. 

after making a punnet square using bv bv bv bv you will find that the ratio will be 9: 7 or a 128.6% probability.

hope this