Federal Act
on the Protection of Waters
(Waters Protection Act, WPA)

¹If wa­ter is with­drawn from or dis­charged in­to a nat­ur­al lake, the strat­i­fic­a­tion and flow con­di­tions in the lake may not be sub­stan­tially mod­i­fied, and no wa­ter-level fluc­tu­ations po­ten­tially harm­ful to the ri­pari­an zone may be al­lowed to oc­cur.

²In the case of wa­ter­courses, the type and loc­a­tion of the dis­charge of fresh wa­ter or waste wa­ter must be se­lec­ted in such a way that as little ar­ti­fi­cial re­in­force­ment and cor­rec­tion as pos­sible is re­quired.