Swiss Civil Code

¹ Every landown­er is ob­liged to re­ceive the wa­ters flow­ing nat­ur­ally from a high­er-ly­ing par­cel of land, such as rain wa­ter, melt­ing snow and wa­ter from un­chan­nelled springs.

² No per­son may al­ter the nat­ur­al course of flow to his or her neigh­bour’s dam­age.

³ Wa­ter flow­ing to a lower-ly­ing par­cel of land and re­quired by that prop­erty may be with­held only to the ex­tent that such wa­ter is in­dis­pens­able to the high­er-ly­ing par­cel of land.