Funnily enough my own underground garage flooded to a depth of about 2cms, (3/4 inch) a few weeks ago in a thunderstorm. Some seeped into the model aeroplane workshop but not in sufficient quantity to cause a problem. I have a drain just outside the door and it is covered by pieces of iron with holes drilled into them. These holes became blocked and the water flowed into the garage. Once I'd removed the iron plates, the drain coped with the water.
Further storms are forecast for next week. Knee permitting I intend to put all of my old rock 'n' roll gear on a pallet and to dig a trench outside the other garage to divert some of the rain water. My exterior garage flooded to a greater depth than the underground garage but did not damage anything.
Now that I'm on the water wagon myself, I may be able to find the time to do this and to get on with a bit more aeromodelling!
