 Ecologically, Taman Negeri Selangor helps to maintain the biodiversity in the river basins and preserve the water quality of the rivers.The forest cover of Taman Negeri Selangor provides the important ecological function of natural flood mitigation for Selangor, Kuala Lumpur and Putrajaya.The forests absorb moisture through plant roots and sponge up large quantities of rainfall in their organically enriched soil system.