We didn't do any studies on the situations you mentioned, but as people who live along the river, we are seeing those things.
Either Université du Québec à Montréal or Université de Montréal did a study on lake Memphrémagog, and we used it for our purposes. That's where the 300‑metre distance from the shore comes from. However, the Richelieu River is only 200 metres wide, so people shouldn't be allowed to use their wakeboards on the river, but they do.