Here it is taken to include all forms of particulate loss and all issues associated with the resulting sediment gain by other parts of the environment.
Mae ei ystyr yn y fan hon yn cynnwys pob math o golled ronynnol a phob mater sy’n gysylltiedig â’r gwaddodion a enillir o ganlyniad gan rannau eraill o’r amgylchedd.