This does happen. Apparently Chicago diverted the sewage and pollution in the Chicago river so that it would flow into the Mississippi river rather than onto Ch

This does happen. Apparently Chicago diverted the sewage and pollution in the Chicago river so that it would flow into the Mississippi river rather than onto Chicago's shores of Lake Michigan: https://waterwars.wordpress.com/2006/12/02/a-brief-history-of-the-chicago-diversion/ https://waterwars.wordpress.com/2006/12/02/a-brief-history-o...