Completed in 2010, the stormwater retrofit project at the County Parking Lot at S. Townsend Street involved repaving the lot with new asphalt pavement, restriping lanes, and installing two 8-foot wide tree infiltration trenches. The redesigned lot contains 163 parking stalls, six of which are Americans with Disabilities Act (ADA) accessible. The tree trenches feature the use of structural soil to provide adequate rooting volume for the proposed trees and additional native vegetation.
The two tree trenches are designed to capture and infiltrate the surface runoff from the repaved asphalt lot. Runoff enters the tree trenches, providing irrigation for the trees and additional vegetation before eventually infiltrating into the ground below the trench. The infiltration trench design features overflow control measures to prevent localized flooding and oversaturation of the planting/structural soils. This project is expected to capture approximately 975,000 gallons of stormwater per year from the lot and adjacent pavement areas.
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