The Siebenbrunner Bach is an important watercourse in the Augsburg city forest. It is formed by the union of the Neuer Graben and the Gießer in the Preßmarschen Gut and flows through the former Siebenbrunner Unterdorf towards the Siebentischpark. At the height of the Botanical Garden it splits into the Brunnengraben and the Spitalbach. 
Historically, the Siebenbrunner Bach was a spring stream, fed by five spring fields along the Lech. Until the 1930s it supplied a mechanical weaving mill in the Siebenbrunner Unterdorf. In the 1970s the settlement was abandoned for reasons of drinking water protection, the buildings were demolished and the areas reforested. Today a chestnut avenue surrounded by spruce trees and a playground are reminders of the former settlement. 
A special technical facility on the Siebenbrunner Bach is the Galgenablass. Here the Grenzgraben crosses the Siebenbrunner Bach using a culvert to keep the spring and Lech water separate. This construction served to separate drinking water from industrial water and is part of the UNESCO World Heritage Site “Augsburg Water Management System”. 
The Siebenbrunner Bach is not only an important part of the Augsburg water system, but also a popular destination for hikes and nature exploration in the Siebentischwald. Its historical and technical features make it an interesting place for visitors.