How Can Trees Help Dallas?

 Water and Soil

  • Planting trees along streams, wetlands, and lakes helps control water and soil runoff. This also removes sediment, reduces flood damage, and increases water quality by reducing the pollution of water runoff by as much as 80%.
  • Healthy, vegetated stream buffer zones reduce the total amount of suspended solids of phosphorus, nitrogen and heavy metal transfer from urban areas into streams by 55% to 99%.
  • Numerous studies have correlated the reduction of loss in streamside trees and vegetation with the reduction of aquatic diversity and up to an 86% decline in the total fish population.
  • One square mile of forestland produces 50 tons per year of sediment in our streams and lakes, whereas one square mile of farmland produces 1,000 to 50,000 tons per year of sediment and one square mile of land prepared for construction can produce 25,000 to 50,000 tons per year of sediment.
  • In one study, a tree canopy reduced surface runoff from a one-inch rain over 12 hours by 17%.
  • In natural watersheds with trees and vegetation, 5% to 15% of stream flow is delivered as surface storm runoff. In highly developed areas, over 50% of the stream flow is from surface runoff.