Managing Rainwater for Urban Sustainability Using Trees and Structural Soils manual issued

Managing Rainwater for Urban Sustainability Using Trees and Structural Soils « Rainwater Management « WaterBucket.ca:
Urban Trees Enhance Water Infiltration
A group of researchers from Virginia Tech, Cornell, and University of California at Davis have been investigating innovative ways to maximize the potential of trees to address rainwater/stormwater in a series of studies supported by the U.S. Forest Service’s Urban and Community Forestry Grants Program.
Virginia Tech scientists used two container experiments to establish that urban tree roots have the potential to penetrate compacted subsoils and increase infiltration rates in reservoirs being used to store rainwater/stormwater. In one study, roots of both black oak and red maple trees penetrated clay loam soil compacted to 1.6 g cm-3, increasing infiltration rates by an average of 153%.
Structural soil reservoirs may provide new opportunities for meeting engineering, environmental, and greenspace management needs in urban areas. Further research is needed on the effects of tree roots and detention time on water quality in structural soils. Monitoring continues at four demonstration sites around the United States and updated information is posted as it becomes available.

EPA approves use of trees as part of stormwater strategy in CSO; Louisville, KY

MSD to buy thousands of trees | courier-journal.com | The Courier-Journal
Louisville is about to get a lot greener. The Metropolitan Sewer District will spend $500,000 through next June and plans another $1 million in the following two years to plant as many as 10,000 trees.“After the double whammy of the windstorm and ice storm, our community saw terrible damage to our tree canopy,” said Kerri Richardson, spokeswoman for Mayor Jerry Abramson. “The scale of this project is staggering — thousands upon thousands of new trees—– and it couldn't arrive at a better time. This is a project that will return benefits for decades".
Sewers and trees may seem like an odd combination, but MSD views the effort as one way to help prevent rain from flooding the system and sending sewage overflowing into Beargrass Creek and the Ohio River.
A settlement with the U.S. Environmental Protection Agency requires MSD to reduce sewage overflows, and MSD has proposed an $850 million plan to tackle the problem by 2024 — including money for the trees.