These areas will benefit from planting trees which will absorb high volumes of water and therefore reduce the amount of water draining off farmland.
Byddai’r ardaloedd hyn ar eu hennill o gael coed wedi’u plannu arnynt gan eu bod yn amsugno llawer iawn o ddŵr gan leihau faint o ddŵr sy'n draenio oddi ar dir fferm.