5. how much water runs off an asphalt driveway that is 12 ft x 62 ft long? give your answer in liters. (2 marks) a. b. the homeowner now constructs a carport with a green roof over 20 ft of the driveway, and the remaining 42 ft of the driveway is resurfaced with permeable paving stones. the green roof has a water retention capacity of 90%, and the pavers would allow 80% of rainwater to percolate into the soil. what volume of stormwater runoff is generated from their driveway now? give your answer in liters, and also state how this volume compares as a percentage of stormwater runoff before renovations. (3 marks)