25 October 2004
OFFICE COMPLEX RETROFIT. This example illustrates how an existing
office building complex can be retrofit with LID components to improve water quality.
This complex is located at the Anacostia Annex of the Washington Navy Yard in
Washington, D.C. This area has extremely flat topography with clay soils. Because of
its proximity to the Anacostia River, there is a high water table. No stormwater
management quantity or quality controls are currently being used. The existing asphalt
surface has been patched several times and is in poor condition. A full-depth
replacement of the parking area is required. Many of the drainage inlets and old brick
drainage structures are cracked or broken and need to be replaced. Much of the
sidewalk surrounding the building is also cracked or heaving and the site pedestrian
access does not comply with current Americans with Disabilities Act (ADA) Standards.
Much of the existing vegetation around the building is overgrown and the lawn areas are
in poor condition from compaction and poor management. This condition creates an
opportunity to retrofit the parking area for immediate water quality improvements and
make long-term recommendations for the entire area.
Figure 10-1. Landscaped Area and Parking Area
PROJECT OBJECTIVES. The objectives for this retrofit are to:
Integrate water quality management practices into the repaving of parking
Repair the sidewalks
Funding for LID retrofits has been approved as part of the paving and
reconstruction so that the area will comply with local stormwater quality regulations.
Pollutants of concern for this watershed are oils and grease, total suspended solids,
nitrogen, and phosphorus. All of these pollutants are generated by the land use. In this