The purpose of the present Act is to regulate the use of public waters, public corporate waters, public groundwater and private waters. At the outset the Act contains a definition clause relating to various terms employed therein, such as “use of waters”, “public cantonal waters”, “public corporation waters”, “public groundwater”, “private waters”. Article 11 establishes that every use of water is prohibited, if it jeopardizes the public interest and, in particular, the potable water supply, the