New lake design reduces phosphorus pools, boosts freshwater biodiversity.
A study on a new lake in Denmark found that relocating nutrient-rich sediment to deeper areas with high bottom shear stress can reduce phosphorus levels in the sediment. After 530 days, 69% of the phosphorus pool in surface sediments was lost, mainly through washout. Managing a lake with initially shallow water and short retention time, along with locating the outlet in a wind-exposed area, can help promote desired ecological qualities. Additionally, planning for deeper sedimentation areas that are easily accessible for dredging can further reduce nutrient release.