Hachinger Bach 1.76

The Hachinger Bach is a river in Bavaria, Germany. It flows southwards of Munich, through the townships of Oberhaching, Taufkirchen, Unterhaching and Unterbiberg, and enters the Munich city area in Perlach. It is twelve kilometers long.The source of the Hachinger Bach is in a former glacial valley between the districts of Deisenhofen and Oberhaching, where water from the Deininger wetland flows as groundwater through the Gleißental, which connects to the Hachinger Tal. About 100 metres into the Hachinger Tal, the ground becomes progressively wetter due to exudation of groundwater, until a small stream forms. Due to fluctuations in the water table, no location can be assigned as the source.To keep the stream from running dry, water is piped into it. The stream is further fed by additional groundwater and influx from sources such as the Taufkirchen duckpond. The flint layer that had kept the groundwater close to the surface, allowing the stream to form, drops deeper just north of Unterhaching, which also causes the water table to drop. That would have caused the river to go underground in the gravel of the Munich floodplain, but due to the formation of a silt bed caused by the stream itself, it only goes underground just north of Ostpark at the borders of the districts of Perlach, Ramersdorf and Berg am Laim.