Waldrausch (1977)

Waldrausch is a 1977 German drama film directed by Horst Hächler and starring Uschi Glas, Alexander Stephan and Siegfried Rauch. A farmer tries to block the ambitious plans of an architect to build a new dam and flood a valley. It was based on the 1907 novel Waldrausch by Ludwig Ganghofer.

More at Wikipedia.