I have a potential customer whose driveway is collecting water from heavy rains that runs into the yard and right to the home. Unfortunatley the home is located so that the yard also angles towards the house. There is a obvious trench that the water is running down. I am thinking I can put a catch basin in the trench so that the water can be captured and drained through some 4" flexible drain pipe and released past the house. Question I have is when do you decide to use a non perferated pipe to drain water, versus using a drain rock filled trench with perferated drain pipe? If I can put a trench in so that the water from the yard would run across it, would a drain rock filled trench with perf pipe be better? I think in this instance the catch basin and non perf pipe is the way to go. Am I correct in assuming that a drain rock filled trench would be more suited to draining an area of standing water, rather then a situation where there is a concentration of water from heavy rains?