A site with plenty of green spaces among the paved areas will have less runoff, and percolation through the soil will remove many of the contaminants swept from the asphalt and concrete.

• 因为路面附近有大片绿地的地点，迳流量将会减少，而渗透土壤的过程，也会清除来自柏油地面和混凝土地面的许多污染物。