Project Partners

This demonstration project is a collaborative effort involving vari-
ous partners. EPA's Office of Water provided conceptual designs
for the LID practices being demonstrated. The Facilities Manage-
ment Division of EPA’s Office of Administration and Resources
Management oversaw their construction. The General Services
Administration (GSA) designed and maintains the landscape,
including trees and plants. Others parties joined as this project
evolved, including the U.S. Commission of Fine Arts, the National
Capital Planning Commission, the DC Water and Sewer Authority,
and a variety of contractors.

Viewing the Demonstration Project

If you have questions or are interested in a tour of any portion of
the demonstration project, please contact LIDHQ@epa.gov.

Porous concrete walkway and rain garden at Ariel Rios South Courtyard.

For More Information:

= EPA Office of Wetlands, Oceans and Watersheds—
Demonstration Project:
www.epa.gov/owow/nps/lid/stormwater_hq
EPA Office of Water—Low Impact Development:
www.epa.gov/owow/nps/lid
EPA Facilities—Greening EPA:
www.epa.gov/greeningepa/stormwater/index.htm
EPA National Menu of Stormwater Best Management
Practices: www.epa.gov/npdes/menuofbmps
Low Impact Development Center:
www.lowimpactdevelopment.org

U.S. Environmental Protection Agency
Office of Water (45037)

1200 Pennsylvania Avenue, N.W.
Washington, DC 20460
EPA841-F-06-005

November 2006



" $41F06005

“@ ) Stormwater Management
S42) at EPA Headquarters

Low Impact
Development
(LID) practices
help retain as
much stormwater
as possible on
the land.

EPA is demonstrating several LID techniques at its Washington, DC Headquarters.

The Problem with Stormwater Runoff

In developed areas, roofs, pavement, and other impervi-

ous surfaces prevent stormwater from soaking into the

ground. Instead, it runs over the land surface and directly

into small tributaries and larger streams. Unable to handle

the increased water volume and flow, these waterbodies

often experience eroded banks, incised channels, loss of

habitat and aquatic life, and increased flooding and prop-

erty damage. In addition, stormwater carries a broad mix

of toxic chemicals, bacteria, sediments, fertilizers, oil and Stormwater runoff from roads, parking lots, and other

grease to nearby waterbodies. impervious surfaces flows into storm drains, which lead
f. to nearby waterbodies,
Retaining as much stormwater as possible on the land—

rather than letting it run into storm drains—can help
keep harmful flows and pollutants out of our streams and
rivers. Low impact development (LID) is one crucial tool
used to deal with the stormwater runoff problem.

Reducing Runoff with Low Impact
Development

LID is development that results in low impacts on natural

resources. This is done by using planning and designs

that preserve green space and manage stormwater to

minimize increases in flow and pollutants. LID techniques

include conservation of forests and sensitive waters, water A bioretention cell, also called a rain garden, is one
“ 7 . of the LID practices being demonstrated at EPA

reuse, and stormwater controls that detain and retain runoff. Headquarters



Practices at EPA Headquarters

EPA promotes the use of LID techniques in several of its water
pollution prevention programs. While LID techniques reduce the
amount of pollution entering the nation’s waterways, they are still
not widely used. To encourage more government agenciés and de-
velopers to use LID, EPA is demonstrating several LID techniques
at the Agency’s Headquarters in Washington, DC. The demonstra-
tion project illustrates what LID practices can accomplish and
shows their visual appeal.

The project involves LID and other stormwater management
practices at three sites: Ariel Rios South Courtyard, Constitution
Avenue, and West Building Parking Garage.

Stormwater Management Practices at EPA Headquarters

Location
Practice Environmental Benefits ‘viel hos Sbuth | West
Courtyard Constitution Avenue Building
Bioretention cells Allow stormwater to filter into L :
Se LT the ground rather than wash =
off the surface and into storm
Aaeoiive aves drains and combined sewers 1:
Collect and store stormwater
Cisterns for later use in landscape iB =
irrigation
Sustainable planting T#Ke up stormwater, provide = a

wildlife habitat

Reeve indfeclals Reduce solid waste and reliance -
on raw materials

Recycled granite curb used as a bench at the Ariel Rios South Sustainable plantings at the Ariel Rios South Courtyard. Information
Courtyard; permeable pavers used next to bench and permeable about tHe vegetation is provided in a guide available at
concrete used on pathway. www.epa.gov/greeningepa/stormwater/ars_plantplan.htm.

Numbered signs made from recycled farm implements direct
visitors to the guide.



Ariel Rios South Courtyard Features:

= Two bioretention cells (also called rain gardens)

= 564 sq. ft. of permeable concrete and permeable
pavers

= One 1300-gallon cistern for stormwater collection
and landscape irrigation

= Site-appropriate and/or native vegetation
= Signage made from recycled farms tools
= Bench made from an historic granite curb

= Cistern artwork made from recycled glass

wate Co te Conc EPA Rios Souh Courtyard
Entance Se

Drawing of Ariel Rios South Courtyard demonstration site highlighting various LID and other
demonstration practices (Left).

Constitution Avenue Features:
= Four bioretention cells

= High efficiency irrigation using collected
stormwater

West Building Parking Garage Features:

= Six 1000-gallon cisterns for rooftop stormwater
collection

= Irrigation system delivers collected stormwater to
Constitution Avenue bioretention cells

Porous pavement at Ariel Rios South Courtyard.

View of Ariel Rios South Courtyard from east wing of EPA
Headquarters.

Bioretention cell in front of EPA Headquarters West Building
on Constitution Avenue