When rain hits a driveway, it sits on top in puddles or it rolls right off the asphalt towards a storm drain or creek. This can cause flash flooding because water can’t trickle into the ground and all the rainwater rushes to the nearest creek instead.
What if a driveway could absorb water? It could be made from gravel, concrete blocks or even something called, porous asphalt or concrete. The more rain that can be directed to flow through the driveway and get absorbed by the ground, the less water that flows into the pipes that are connected to nearby creeks.
- See more at: http://www.surrey.ca/city-services/3646.aspx#sthash.uHTwzrnr.dpuf