text: There is a flood retention bassin here, empty exept for times of grat precipitation. The pipe leading the water to the bassin begins just before the Schießbach crosses the Gaildorfer Straße, at the knee of it there. The water must be rather high before it passes over a barrier there and is then condicted to the bassin. 
  
  See also
  
  https://de.wikipedia.org/wiki/Schie%C3%9Fbach_(B%C3%BChler)
  
  and the Commons-photos linked there