International audienceModern law is composed dominantly of new fields of complex legislations such as biotechnologies laws, environmental laws or intellectual property. But a particular legal area stigmatizes more than the others this increasing complexity: the water protection laws.Due to its origins deeply established in the European culture, but also due to ethical, political, economical and social issues, water protection laws appear to be the typical representation of links between risk and complexity. The European water protection law is deeply complex on two scales. First, on the European scale: this field is characterised by a growing normative proliferation for the last thirty years, which seems to follow public opinion. Second, to...