Trees and forests play a critical role in capturing rainwater and reducing the risks of flooding and landslides. Their intricate root systems filter excess sediment, nutrients and toxins before they enter waterways, reduce erosion and flooding, and shade streams so they are at optimal temperatures for aquatic wildlife.
Trees also absorb water from the air through their leaves, although a higher percentage comes through their roots. A large tree can capture and retain as much as 332 gallons of water! | SOURCE