In former times, the Isar river in Bavaria was used to transport timber from the alps to the cities downriver (Munich, Landshut and others), but that ended with the invention of the railroad. Also, the Isar river was dammed to be able to build power plants. Nowadays, there is only rafting for fun on a 25 km long portion of the river. The rafts are basically floating beer gardens, including a band and a camping toilet (the logs are re-used for rafting). To let the rafts pass by the power plants, raft ramps were built. This one is the longest in Europe, 345 meters long and 17 meters high, with the incline starting at 9%, then 7%, then 5%. The rafts reach up to 40 km/h when going down. You can also go on the river (in this case, on the canal) by rubber boat or kayak, but the power plant people won't let you ride down the ramp (they control the water flow and the entry gate). --- Die Floßrutsche am Kraftwerk Mühltal (bei Straßlach, unten gibt's das empfehlenswerte Gasthaus zur Mühle) und darauf ein Floß. Viel Spaß!
Nothing in the world is more yielding and gentle than water. Yet it has no equal for conquering the resistant and tough. The flexible can overcome the unbending; the soft can overcome the hard. - Lao Tse