Little streams in gullies like this one flow through Freiburg and are called Bächle. Originally, these streams were used as a water supply or for sewage or to fight fires, depending on whom you ask. Legend has it that if you step in one, then you have to marry a Freiburger. Even worse, your foot is wet. I have yet to see anyone step into a Bächle, but I'll keep you posted.