Beaver dams can also contribute to improving water quality by storing sediments containing nutrients and pollutants, reducing the amounts that will be transported downstream.
Gall argaeau afancod hefyd gyfrannu at wella ansawdd dŵr drwy storio gwaddodion sy'n cynnwys maetholion a llygryddion, gan leihau'r symiau a fydd yn cael eu cludo i lawr yr afon.