Right now, my driveway slopes towards my house. It slopes 4.5 inches over 52 feet. There is NOTHING that can done with changing the floor height of the garage or the level at the top of the driveway. What options do I have? This is somewhat of a major renovation, but again, cant change the start or end heights. The driveway is 20 feet wide, so obviously 1040 sqft feet of driveway feeding into my garage is NOT ideal. My idea was to have the driveway slope UP for 42 feet at 1% (5 more inches), then for the last 10 feet have the driveway slope down at 8% (for a total of 8.5 inches down, which is what I would need). I would have a trench drain at the entrance, and then I would only have 200 sqft of water flowing towards my garage. From my calculations, and using a 2.5% for a 25 year rainfall (NJ/USA), I would have a drainage need for 20 cubic feet. Since the drive way is 20 feet wide, I could just have a trench crosssection of 1 sqft, and then I should be "ok". Does this all make sense?
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