There is a dry well under my driveway to catch the rain from my gutters. I would say it holds about 6-700 gallons maybe more plus it has holes to let the water seep out. It is overflowing onto my driveway!!!! I have never seen that thing more then half full during some pretty big storms when the ground was still wet from other rain!!!!!
Tell be about the water. Since I got to work at 7 am we had to dispatch the FD at least 11 times for basement pump outs. Had the highway shut down for over an hour. I tell you people don't know how to drive in the rain either and when they are in traffic because of 5 feet of water they ask the dumbest questions.