GREEN STREETS | GREEN JOBS | GREEN TOWNS INITIATIVE
Hie Green Streets, Green Jobs, Green Towns Partnership (G3) aims to stimulate the green jobs market and enable families to work
where they live and play. Small to mid-sized communities can boost their local economies and protect water resources through the
use of watershed planning, design and construction of stornrwater best management practices,
1.2 acres fully treated in
1111 rainfall events up to 1.2"
IIII
iik
39,549 gallons stormwater
retained on site per severe
rain event
6,125 ft2 of bioretention
41 trees
900 native plants
Qoo Hundreds of students engaged
per year

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TOW

.MUST
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"GREEN-O-VATION" PROJECT -
O STREET GREEN STREET AT DUNBAR
HIGH SCHOOL - WASHINGTON, DC
Washington, D C., illustrates innovative green infrastructure with a twist -
integration into a high school curriculum
d.
The Washington DC City Govern-
ment has redesigned a portion of O
Street, NW, as a green street
concurrently with the rebuilding of
adjacent Dunbar High School. The
"Green-O-vation" project is an
excellent demonstration of how
implementation of imiovative
stormwater elements can be
integrated into an existing
construction project. Three District
Departments (Enviromnent, Gen-
eral Services, and Transportation)
collaborated to design and build the
green street, which includes 6,125
square feet of bioretention cells to
retain 1.2" of stormwater from a
1.2 acre drainage area.
Stormwater management and
retainage/ treatment on site is even
more important in this area of the
DC, served by a combined sewer
system (CSS). During heavy
rainfall, sewage and stormwater
combine and overflow directly into
the Anacostia River. This project
will help retain approximately
39,549 gallons of stormwater from
reaching the CSS during a 1.2" rain
event. The project also helps
Green Streets, Green Jobs, Green Towns Initiative // Stories of Green Infrastructure
relieve flooding in two adjacent
neighborhoods that have frequently
flood during storms, showcasing
yet another advantage of the green
street project.
One final benefit of the project is
the ability to engage the students at
Dunbar High School. This
institution was founded as the first
public high school for African
American students in the United
States. Since its founding, Dunbar
lias graduated many well-known
alumni including Sterling Brown,
H. Naylor Fitxhugh. Nannie Helen
Boroughs, Duke Ellington current
District congressional Delegate
Eleanor Holmes Norton and fonner
District Mayor Vincent C. Gray.
CKnnct 0*p*rm*m o( TwuporMtien
Dunbar High School
U.S. Capital Building
RFK Stadium
iLegend

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PROJECT ELEMENTS
•	Impervious pavement removal- Removal of pavement - about 8 feet of
roadway to narrow it - allows installation of other practices that treat stormwater.
•	Bioretention cells - These features filter and reduce stormwater runoff, allowing
it to infiltrate into the ground before it enters into the storm drain system.
•	Tree pits and expanded tree wells- Extended tree pits and wells into the street
both reduces impervious surface cover and also reduces street area, narrowing the
road and slowing traffic, increasing likelihood of pedestrian use.
•	Increased Urban Tree Canopy- In urban areas a single tree can intercept from
500 to 4,000 gallons per year. Even young, small trees help, capturing 50 gallons
per year. Trees not only treat stormwater, they provide a host of other benefits,
including energy cost reduction in both summer (shade) and winter (proper
placement can result in the reduction of energy use by 20-50%), aesthetics,
property value enhancement, business traffic enhancement, and health benefits.
•	Educational Signage - Due to the proximity to Dunbar High School, this site
will be used for years to come to teach students about stormwater management.
The project is already being integrated into the school's curriculum.
SUSTAINABILITY & GROWTH; ADDITIONAL GREEN ACTIVITIES
This project not only helps the District attain the Sustainable DC target of using
75% of the existing landscape to manage stormwater runoff, but serves as an
important model for installing low impact development (LID) in the public right of
way. This project was designed to retain runoff from the 90th percentile storm for a
52,877 square foot drainage area. This aggressive approach at reducing stormwater
runoff helps show agencies throughout the District and the region that stormwater
retention projects can be successfully implemented in areas with limited space and
considerable institutional barriers. Development of the design for this project
displayed strong collaboration between local government agencies with varying
responsibilities. This program is also designed to provide information about the
impact of LID in the District on reducing combined sewer overflows to the
Potomac River and Rock Creek.
G3 Grant Awarded: $95,000
Match Contribution: $436,626
Status:	Completed 2015
green street
The project will have extremely local benefits as well, complementing other green
aspects of the new Dunbar High School building. The new building was designed
to achieve LEED Platinum for Schools certification. The new school uses a
geothermal heat piunp, a 500,000 kW photovoltaic array, two 20,000 gallon
cisterns for reusing stormwater, enhanced acoustics, materials with low
concentrations of volatile organic compounds, and plentiful daylight and views.
The green street project provides educational value and serve as an outdoor
classroom demonstrating "real life" restoration and stormwater management to the
student body and faculty of Dunbar High School and die surrounding community.
Project engineers and Dunbar High School Faculty work together to integrate the
"Green-O-vation" project into environmental science and sustainability lesson
plans.
For additional information: visit wvwv.epa.gov and www.cbtrust.org.
Similar efforts: Jay St NE Green Street
Project Partners: District Department of the
Environment; District Department of General
Services, District Department of
Transportation, EE&K Architects and
Engineers, Moody Nolan Architect,
Chesapeake Bay Trust, U.S.
Environmental Protection Agency
Similar efforts: DCs 1st StNE Green Street

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