No such laws in Russia. And it seems no such laws in Poland. No for Ukraine, no for Belarus, Kazahstan even has some bonuses if you collect rainwater, Latviya has some bonuses too.

You are definitely wrong. I work in municipal development and a developer retaining water on site beyond what is necessary to offset their increased impervious cover is something that's highly discouraged and restricted.

Water need to go to the rivers and aquifers, and damming it up for private use is a real problem.