Det er den berigelse af vandet med nitrogen og fosforforbindelser, som fører til øget vækst af alger, blomster og andre former for planter, hvilket skaber ubalance i forekomsten af organismer i overfladevandet.
This is the enrichment of water by nitrogen and phosphorous compounds which causes the accelerated growth of algae, bloom and other plant life which results in an imbalance of organisms present on surface water.