How do trees relate to storm water management? Trees need water to survive and grow tall. They soak up water with their roots and then transport the water up through their trunks to the leaves in their canopies. The leaves release the water to atmosphere through evapo-transpiration. Also the tree roots and leaf litter create soil conditions that the slow the flow of water on the ground and increase infiltration of rainwater into the soil. In these ways, trees planted near porous pavements such as streets and parking lots help reduce the amount of water flowing into the combined sewer system.
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