Demonstrating
Innovation:
A
Stormwater
Retrofit at the Providence Supervisor's Office
General
Project Description
This LID
demonstration project is located within the Accotink Creek
watershed and has a drainage area of .83 acre. In addition
to the Providence Supervisor's Office, the site is also the
location of the County's Merrifield Fire Station #30. The
overall complex encompasses a land area of 1.8 acres with
approximately 1.44 acres being impervious. The proposed work
will serve as a highly visible demonstration project featuring
three LID practices: a bioretention basin (rain garden), a
green roof, and permeable pavers. The bioretention basin and
permeable pavers with infiltration trench will allow runoff
to drain into an underlying retention area where it can then
slowly infiltrate into the surrounding soil. The green roof
installation on an existing concrete storage structure will
serve to reduce rooftop stormwater runoff and provide a comparison
to an adjacent storage structure with an impervious roof.
The bioretention basin will occupy an area of 680 ft2 and
the permeable paver area is 1,550 ft2 in size, with a combined
volume of approximately 9,841 ft3 in the underlying infiltration
trench. The disturbed area will be 2300 ft2 in size. The green
roof will occupy an area of approximately 240 ft2. These three
integrated LID practices will work in harmony to address both
water quality and water quantity retrofit goals on the site.
They are expected to retain and infiltrate a significant amount
of the stormwater currently running off the impervious surface.
Read
our proposal
pdf
file (large)
A
conceptual diagram of the new rain garden and permeable pavers
area at Fire Station 30 - part of the recently-awarded DCR
Grant
to the Supervisor.
Related:
Environmental Excellence for Fairfax County
A 20-Year Vision
Related:
Low Impact Development: Controlling Runoff at its Source
Related:
DPWES LID document
(pdf
file)
Project
Scope/Map:
The
grant received funding from the Environmental Protection Agency's
Chesapeake Bay Program at the Virginia Department of Conservation
and Recreation.
