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The Trees 

The road also has to be safe by modern standards - AASHTO standards - American Association of State Highway and Transportation Officials. These can be very involved in a project like Klingle. They require barriers and curbs and those need deep concrete footings to hold them. Very many trees will need to be felled to construct the road, and construction damage to even more tree's roots will spell slow death for many more trees. Many of the doomed trees are on federal parkland, which is protected by a series of laws.

David Murphy, also speaking at the Nov '00 meeting  representing the National Park Service said: "The National Park Service is confronted with a continuing and constant level of work to preserve that valley. We have worked with the District of Columbia for approximately that last twenty years, looking at various schemes for restoration of their roles which is a narrow band within the broader sections and adjoining park land. The alternative that was studied in 1991 created a requirement for an extensive number of trees to be removed in that construction. However, alternatives that we have seen that involve pavement appear to require use of parkland and/or in a direct or indirect injury impacts, i.e., loss of trees and affect on the drainage and grading of that Park. The National Park Service cannot support or encourage the District of Columbia to pursue a paved solution in this valley and they are committed to providing access for infrastructure such as storm water and gas lines"

Satellite imagery shows that our heavy tree cover (green) has declined by 64 percent in 25 years.

 

Tree/Canopy Cover

< 20% 20 - 29% 30 - 39% 40 - 49% > 49%

 

AMERICAN FORESTS used satellite data to measure the loss of tree canopy from 1973 to 1997 on 43,938 acres in the District of Columbia.
  • Natural tree cover (areas with at least 50% tree cover) declined from 37% to 13% of the total area.
  • Average tree cover declined from 37% to 21%.
  • Heavily developed areas (with less than 20% tree cover) increased from 51% to 72% of the total area.
  • Tree loss resulted in a 34% increase in stormwater runoff (29 million cubic feet) at a cost of $226 million.
  • Total stormwater retention capacity of the urban forest in 1997 was worth $440 million
  • The lost trees each year would have removed 354,000 pounds of air pollution at a value of $996,000.