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REGULATING WATERSHEDS
Upstream, forests provide three important benefits:

They preserve water quality by minimizing soil erosion, reducing sedimentation of water bodies (wetlands, ponds, lakes, rivers, watercourses) and catching or filtering polluting substances present in dead plant material.
Forest plantations tend to use less fertilizers and pesticides than agricultural or fodder plantations, thus, they are better for preserving clear water.
During wet seasons, forests are able to mitigate local small floods, and thanks to their deep roots they help to stabilize hills and to prevent shallow landslides.