17

Transit-Oriented Approach

03 conceptual diagram

+ + + =TrAnspOrTATiOn infrAsTrucTure

public TrAnsiT

surfAcepArking lOTs

sTOrmwATer bmps

effecTivegreen

sTOrmwATer infrAsTrucTure

design concept

given that multiple transit lines and transportation corridors cross the project area, the opportunity emerges to combine best management practices for stormwater management with public and private transportation. Bmps can be incorporated into transportation infrastructure, can enhance public transit facilities, and can take advantage of large parking lot surfaces.

Furthermore, the fact that high volumes of commuter traffic flow along market, chestnut, and Walnut streets every day makes Bmps along these routes highly visible.

n 0 600400100

18

green Transitcorridor

03 site design Key

perviousparKing lot

BmpBus stop

railrain

garden

tree trench BiosWale

marKet st.

to center city

to center city

to suBurBs

to suBurBs

to clarK parK & trolley lines

n 0 600400100

CHESTNUT ST 41st st

WALNUT ST

SANSOM ST

LOCUST ST

SPRUCE ST

50th St

FARRAGUT ST

19

market streetwavegardens

03 site design Key

perviousparking lot

BMPBus stoP

railrain

garden

tree trench BiosWale

n 0 600400100

MARKET ST

CHESTNUT ST 41st st

WALNUT ST

SANSOM ST

LOCUST ST

SPRUCE ST

50th St

FARRAGUT ST

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site design03

market streetwavegardens

at 46th st. emerges and runs along an elevated track to the west along market st. Between 50th & Farragut st., the tracks add up to 84,000 sq ft (almost 2 acres) of impervious surface. run-off polluted by contact with heavy metals of the cars and rails is piped directly through downspouts into the sewer system. Because these pipes are exposed just above the pylons, they could be disconnected and redirected through green stormwater infrastructure systems.

the market st. median also presents opportunities to locate infrastructure and enhance the under utilized space beneath the elevated rail.

precedent for public art exists on painted pillars near the station entrances. Working in partnership with the mural arts program or other arts organizations, stormwater infrastructure can showcase community artwork along the elevated rail corridor.

21

site design

market streetwavegardens

03

Evapotranspiration

infiltration

overflow diversion

street & sidewalk run-off

PreciPitation

ElEvatEd track run-off

elevATed TrAck run-Off

each section of track contributes around 130 cubic feet of run-off during a 1” storm that is sent directly into the combined sewer system from downspouts in the track pylons.

cisTern

By disconnecting the track downspout at the base of each pylon, stormwater run-off can be diverted into adjacent cisterns with a capacity of 950 gallons - a volume that holds 90 percent of run-off from each section of track during a 1” storm.

cAscAding rAin gArden

rain gardens feature hardy local plant palette that filter stormwater, but also build upon a tradition that incorporates art into the public realm. the planters provide a surface for local artwork, while drawing attention to the urban hydrologic cycle and stormwater management in philadelphia.

storesoak divert

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public Transitgreen way

site design Key

perviousparking lot

BmpBus stop

RailRain

gaRden

tree trench BiosWale

03

n 0 600400100

MARKET ST

CHESTNUT ST 41st st

WALNUT ST

SANSOM ST

LOCUST ST

SPRUCE ST

50th St

FARRAGUT ST

23

site design03

public Transitgreen way

Four bus lines cross the project area. the 21 travels east and west on Walnut and chestnut streets, while the 31 and 64 travel north-south on Farragut street and intersect with the 46th street el station. Because most bus stops in the project area do not have shelters and coincide with low points and sewer inlets on many block corners new shelters could be designed to divert or intercept run-off from streets and sidewalks before it flows into sewers. green stormwater infrastructure along these highly trafficked routes would also be visible to many residents and can treat run-off from relatively wide streets.

the creation of bus stop shelters can also provide the location for interpretive signage about stormwater issues in philadelphia and public art.

precedent for creative bus stops exists on stylized shelters in center city. Working in partnership with the next Fab studio or other arts organizations, stormwater infrastructure can showcase water sculptures or other artwork along bus route corridors.

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site design

public Transitgreen way

03

roof run-off

Street run-off

sidewalk run-off

greened streets

a combination of pervious soft and hardscape can treat both a city block and adjacent streets.

Bmp Bus stops

Feature green or stylized roofs that direct stormwater to cisterns for storage and distinctive signage announcing the bus stop. also the location for public art and interpretive signage about stormwater management.

a

c

e

Bmp Bus stops

pervious parKing lane

Bump-out & raised intersection

B

d

tree trenches & sWales

suBsurFace vault

a

B

B

c

c

d

d

e

store

soakdivert

25

greenedgrocery lot

site design Key

perviousparKing lot

BMPBus stoP

RailRain

gaRden

tree trench BiosWale

03

n 0 600400100

MARKET ST

CHESTNUT ST 41st st

WALNUT ST

SANSOM ST

LOCUST ST

SPRUCE ST

50th St

FARRAGUT ST

26

site design03

greenedgrocery lot

over 15 surface parking lots exist on blocks along the main sewer line and the mill creek burried flood plain. these lots illustrate a pattern of demolition as buildings were removed over time due to deterioration and subsistence problems. Because they lie at low points in the project area, they not only present the opportunity to remove large areas of impervious surface, but to also site green stormwater infrastructure projects that can easily treat an entire block or more.

the parking lot at 44th and Walnut is one such example. once the location of cave-ins, many residents now frequent the lot and grocery store. at 37,000 sq ft, the lot presents a significant opportunity to reduce run-off and improve the aesthetic qualities of the area.

the development of green stormwater infrastructure systems in parking lots allows for projects where a large area can be addressed with the cooperation and partnership of one property owner. in addition, they create the potential to network projects and divert water from multiple blocks.

27

stormwater parking lots

site design parKing lot design

improvements occupy 20% of the lot and manage stormwater from the entire block.

a subsurface vault adds storage capacity and captures water from the street and surrounding blocks.

tree trenches add continuity to the stormwater corridor and allow for infiltration.

greened BlocKs

the construction necessary to treat an entire city block can fit within a large parking lot.

a corner Wide edge corner edge strips pixelsB c d e

a

c

e

corner

corner edge

pixels

B

d

Wide edge

strips

03

inFiltration

decision criteria

BlocK location

developmentpressure

roof run-off

subsurface vault

street run-off

sidewalk run-off

evapotranspiration

parking lot run-off

infiltration

store

soak

divert