I've got one fairly standard suburban house lot. Our main problem is we were one of the first houses on the block and are now the low point of the block. (No lie one of my neighbors was the last house built and their back yard is a foot to a foot and a half higher than mine.) The back yard is all hills and dales at this point and often doing it's best impression of a swamp. Putting in drainage means fewer mosquitoes in general.