Long-term sampling by the Academia Sinica's Institute of Botany shows that the water in the rivers which feed the reservoir has become "obese" with eutrophication. The algae in their waters, which could once only be seen under the microscope, have grown in such large quantities that the surface of the water looks as if it were covered in floating flowers.
中研院植物所長期進行水質採樣，發現水庫上游已得了優養化的「肥胖症」，原本顯微鏡才可見的藻類，大量生長，水面像開了一朵朵水上花。