Suspended Pavement Systems
- A suspended pavement system allows the pavement to rest on a series of pillars, instead of compacting the soil. Tree roots can continue to grow in this system, which increases their water filtration abilities.
- Soil and gravel mixes that act as a base for pavement, called structural soil, consist of 70% to 80% gravel, and 20% to 30% soil that holds stormwater and allows roots to grow, while still meeting the load-bearing requirements to support roadways.
Stormwater Tree Pits
- Stormwater tree pits are modified tree pits with more growing area than a traditional pit. Connecting multiple tree pits maximizes the ability for the reservoirs to hold water and the trees to filter the runoff.
- A wide variety of permeable pavements, from concretes to paver systems, allow water to filter through to the tree roots below, and reduces runoff.
- Forested bioswales feature a graded depression surrounded by trees and other vegetation that filter stormwater before it is channeled into a stormwater drain.