Impervious right-of-way (ROW) in Arlington treated by Green Streets Program.
Impervious ROW in Arlington Treated by Green Streets Program (acres), 2011-2014
The Arlington Green Streets program creates features in the public right of way (ROW) that reduce the volume of stormwater and stormwater pollutants that enter local waterways, rivers, and streams, including the Potomac River and the Chesapeake Bay.
This measure looks at the amount of impervious surface treated by Arlington's Green Streets ROW features that are currently in the ground. These features are listed in Arlington's official retrofit inventory and are publicly owned and maintained.
Stormwater is rainfall that doesn't soak into the ground. Instead, it flows over land into the storm drain network of pipes where it's released — untreated — into waterways. During storms, a significant quantity of stormwater enters streams, causing erosion that exposes infrastructure and undermines trees that line the streams themselves. This runoff can also bring pollutants into the waterways and reduce groundwater recharge, which is important for maintaining a healthy and sustainable ecosystem. Arlington Green Streets aims to reduce this runoff by placing bioretention features and stormwater planters in the ROW. This measure supports to the MTP Goal 6: Advance Environmental Sustainability.
From 2011 to 2014, Arlington increased the number of right-of-way acres in its Green Streets program from 0.9 acres to 3.5 acres. The majority of right-of-way Green Streets projects involve bioretention (the process in which contaminants and sedimentation are removed from stormwater runoff) along streets with heavy traffic volumes. As a result of a Stormwater Management Ordinance that took effect on July 1, 2014, the County will be monitoring impervious surface change for all right-of-way projects that disturb greater than 2,500 square feet of land. Many of these projects will include stormwater management systems required by the new ordinance.
- Arlington Department of Environmental Services internal data, 2011 and 2014.