Panther Hollow Interventions

POTENTIAL INTERVENTIONS

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Direct Drainage to LakePanther Hollow Sub-Basin

Intervention TypesNon-StructuralStructural

Pocket Wetland

Porous Pavement

Rain Garden

All possible interventions were identified throughout the watershed to create a long term “Master Plan” for Panther Hollow.

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existing

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# Potential Interventions

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1Vegetated Swale along north and south side of Schenley Drive

Best

2Porous Pavement bike and pedestrian path (actual location TBD).

Better

3

Porous Pavement Parking Demonstration along Schenley Drive south of Westinghouse Pond

Good

4Rain Garden/ Bioretention along Schenley Drive/Golf Course

5Constructed Pocket Wetland at Wet Area along Schenley Drive/ Golf Course

6Porous Pavement with Infiltration Bed at Clubhouse

7

Porous Pavement Parking Demonstration along Circuit Drive south of Westinghouse Pond

8Reduce Impervious Areas- narrow Schenley Drive (from Tech St to Darlington Rd)

9Landcover Conversion- lawn to meadow on hill above Westinghouse Pond

10

Landcover Conversion- lawn to woodland restoration within golf course and at existing forest edge (preserving WWII memorial)

11Landcover Conversion- lawn to rough/expand rough in golf course

12 Riparian Buffer/Stream Restoration

13Porous Pavement Demonstration along Beacon Street (within park)

14

Infiltration Berm and Trench along downhill side of Beacon Street (remove sidewalk w/in Park) and add in path along the BMP

15

Storage / Slow Release and Porous Sidewalk/Parking Demonstration along Bartlett Street at Park entrance

16Repair/Restore Check Dam along Circuit Drive (retrofit)

17Reduce Impervious Areas- Narrow Bartlett Street

18

Reduce Impervious Areas- Narrow intersection of Circuit Drive & Serpentine Drive- change to meadow

19Reduce Impervious Areas- Narrow Circuit Drive

20Reduce Impervious Areas- Narrow Panther Hollow Road to two lanes

21

Landcover Conversion & Retentive Grading - lawn to meadow around playground and between Bartlett & Beacon Streets

22Landcover Conversion - lawn to woodland restoration at the existing forest edge


Qualifiers Colors

Ranking System

Social Benefit

Non-Structural BMPs

Environmental Benefit Economic Implication

Phipps RunStructural BMPs

Non-Structural BMPs

Panther HollowStructural BMPs


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Qualifiers Colors

Ranking System

Social Benefit

Non-Structural BMPs



Non-Structural BMPs


ASSESSING IMPACT

Non-Structural: Natural measures and design practices which are designed to mitigate any number of stormwater impacts and typically prevent stormwater generation (i.e. convert lawn to meadow).


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Non-Structural BMPs


Structural: Includes natural system-based, which include vegetation and soils mechanisms as part of their functioning and more conventional “bricks and mortar” structures. These BMPs are site-specific.


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Non-Structural BMPs


STARTING AT THE TOP

- PHIPPS RUN SUBBASIN -

SCHENLEY DR

PHIPPS RUN

CIRCUIT DR


Priority InterventionsNon-StructuralStructural

- PANTHER HOLLOW SUBBASIN -

PANTHER HOLLOW STREAM

CIRCUIT

DR

PANTHER HOLLOW RD

BART

LETT

ST

BEACON ST


Priority InterventionsNon-StructuralStructural

Potential pilot projects were identified which manage runoff where it is generated. Strategies at the top of the hill provide best opportunity for infiltration.

1. Vegetated Swale

2. Porous Bike & Pedestrian Path ( Future Project)

21. Landcover Conversion & Retentive Grading

14. Infiltration Berm & Trench

PHIPPS RUN - SCHENLEY DRIVE PANTHER HOLLOW - BEACON & BARTLETT

W H AT ’ S H A P P E N I N G N O W | upper schenley dr.Schenley Drive does not offer a separate and safe path system for cyclists and pedestrians and all stormwater goes to the stormwater pipes.

Stormwater is piped and catapulted to Phipps Run; causing erosion, sedimentation and flashy storm events.

Conventional street and lawn maintenance.

Unsafe for pedestrians and cyclists.

$EnvironmEntal BEnEfits Economic BEnEfits social BEnEfits

40’ ROW

24’ 8’8’

Lawn with minimal potential for infiltration

Runoff to catch basins, then to Phipps Run

No barrier between pedestrians/ cyclists and cars

Curvy and wide road

WHERE THE WATER HITS THE ROAD | upper schenley dr.

0 50 100 150 20025Feet

Create a signature boulevard that welcomes people, slows stormwater and improves water quality through the development of a vegetated swale.

To Squirrel Hill

To Oakland, CMU, Park

Upper Schenley Dr.

Potential Crossing for Water and People

Lower Schenley Dr.

Inlets

Proposed Vegetated Swale

Proposed Pedestrian + CyclistCirculation

Proposed Rain Garden + Wetlands

Gateway or Crossing

Possible Future Stormwater Intervention

F O R T H E W AT E R | vegetated swale only optionA vegetated swale along the north and south hills of Schenley Dr. can enhance the ecological and hydrological health of Phipps Run. The intervention occurs outside the right-of-way and the road profile does not change.

24’ 8’8’

40’ ROW

Swale close to street maximizes visibility, but far enough to minimize impact

of road salt

Swale aligned to not disrupt the golf game

P l A N N I N G F O R T H E F U T U R E | porous pavement pathsThe vegetated swales can be positioned to allow for future plans of a path system. This option uses the existing road bed for the paths and road and maintains a crowned road. The vegetated swale close to the road can convey and infiltrate half of the road runoff.

5 ’ 24 ’ 5 ’6 ’

40’ ROW

Crossings needed for golf course users

P l A N N I N G F O R T H E F U T U R E | “green street”The swales can be positioned to allow for future plans of a path system. This option uses one swale for two jobs: to separate cyclists and pedestrians from vehicles and to convey and infiltrate stormwater from the road.

40’6 - 8’ 24’8 - 10’

40’ ROW

Crossings needed for golf course users

W H AT ’ S H A P P E N I N G N O W | lower schenley dr.Above the headwater of Phipps Run, a shallow grass lined swale exists along with a small wet area, where groundwater seeps. This is also an area where golfers cross the road.

$$

Grass-lined swales along with intense

maintenance regimes offer little ecological

and hydrological value.

Turf areas on golf courses traditionally require

high inputs such as intense mowing regimes,

fertilizers and herbicides.

Pedestrians and golfers do not have safe

means for crossing the road or walking along

the road.

EnvironmEntal BEnEfits

Economic BEnEfits

social BEnEfits

Existing Wet Area

Existing Swale

Existing Crossing

P l A N N I N G F O R T H E F U T U R E | rain gardens + a wetlandThe vegetated swale can be designed with future rain gardens and wetlands in mind. The swale can also be positioned to accommodate the alignment of a future path system and road crossing, whether it be within the existing road bed or meander throughout the floriferous rain gardens and pocket wetland.

“ROAD DIET” | schenley dr ive

Porous PavementPath

Vegetation Buffer

ShoulderDriving Lane

11’ 4’ 6’-8’

Driving Lane

11’

12’ 12’ 8’8’

ExistingProposed

*Not to Scale

*Not to Scale

Driving Lane ShoulderShoulder

Approx. road width 40’ (shoulder to shoulder)


SCHENLEY DRIVE “ROAD DIET”

2’2’

Shoulder

Driving Lane

Runoff

Porous PavementPath

Vegetation Buffer

ShoulderDriving Lane

11’ 4’ 6’-8’

Driving Lane

11’

12’ 12’ 8’8’

ExistingProposed

*Not to Scale

*Not to Scale

Driving Lane ShoulderShoulder



SCHENLEY DRIVE “ROAD DIET”

2’2’

Shoulder

Driving Lane

Runoff

Maximize the environmental benefit by reducing impervious surface.

P l A N N I N G F O R T H E F U T U R E | rain gardens + a wetlandThe vegetated swale can be designed with future rain gardens and wetlands in mind. The swale can also be positioned to accommodate the alignment of a future path system and road crossing, whether it be within the existing road bed or meander throughout the floriferous rain gardens and pocket wetland.

WHAT’S HAPPENING NOW | between bartlett + beacon

$

Grass-lined swales along with intense

maintenance regimes offer little ecological

and hydrological value.

Turf areas traditionally require high inputs such

as intense mowing regimes, fertilizers and

herbicides.

Pedestrians from the surrounding

neighborhoods do not have a continuous

connection to the park from Beacon St.


Economic BEnEfits

social BEnEfits

Runoff from the hillside starting above Beacon St., spills onto Bartlett St. then to the road catch basins. The sidewalk ends on Beacon St. once it leaves the neighborhood.

0 50 100 150 20025Feet

INFIlTRATION TRENCHES + BERMS | bartlett + beacon

Inlets

Proposed Meadow

Proposed Infiltration Berm + Trench (exact shape + location TBD)


Gateway or Crossing


0 50 100 150 20025Feet

To Squirrel Hill

To Oakland

Infiltration berms and trenches can help slow down and infiltrate water on the hillside and also be sculptural elements in the landscape that adorn the hillside. A meadow can also enhance the infiltration capacity of the area, provide rich habitat and decrease mowing. The meadow mowing schedule can coincide with the Grand Prix event.

lANDCOVER CONVERSION + RETENTIVE GRADING | bartlett + beacon

Mown path through wildflower meadow Infiltration berm, fiber log and vegetation to slow down water

Shallow trench to infiltrate water

Potential future sidewalk extension

Utilitypole

Potential future vegetated swale

WHAT’S HAPPENING NOW | the playground, bartlett + beacon

$

Turf areas offer little ecological and

hydrological value. Stormwater is rapidly

eroding the hillside behind the playground.

Turf areas traditionally require high inputs such

as intense mowing regimes, fertilizers and

herbicides.

The playground is a great amenity for families.

Access to the playground could be improved

from the surrounding neighborhoods.


Economic BEnEfits

social BEnEfits

Runoff from the playground and roads is eroding the steep slopes of Panther Hollow Run.

0 50 100 150 20025Feet

lANDCOVER CONVERSION + RETENTIVE GRADING | the playground, bartlett + beacon

Converting lawn to meadow and grading shallow lenses in the land can enhance the infiltration capacity of the area, provide rich habitat and decrease mowing.

Inlets

Proposed Meadow + Retentive Grading


Gateway or Crossing


0 50 100 150 20025Feet

To Squirrel Hill

To Oakland

lANDCOVER CONVERSION + RETENTIVE GRADING | between bartlett + beacon

CALIBRATION OF THE MODEL WITH ALCOSAN DATAThe watershed is generating more runoff than the model would indicate.

Panther Hollow Water BalanceWater Balance Existing Conditions

Drainage Area Area

Average Annual Runoff

Volume Adjusted* Annual ET

Estimated Annual

Baseflow

Estimated Average Baseflow

Rate(acres) (inches) (inches) (inches) (cfs)

Modeled Water Balance for Entire Watershed 177 4.66 19.6 12.20 0.25

Water Balance based on ALCOSAN data (2008) 177 8.26 17.52 10.4 0.21

* ET was adjusted to exclude impervious areas and represents a watershed average.

More runoff is running through Panther Hollow than would be if the landscape were performing better.

The estimated annual baseflow under natural conditions was 0.6 cfs, but...

...we had a much larger drainage area.

WHAT’S AN INTERVENTION WORTH?

Intervention TypeReduced

RunoffIncreased

ETIncreased Baseflow

(in) (in) (in)

Lawn to Meadow 4 2 2

Improved Woods 3 2 1

Removed Impervious 34 20 14

Impervious to Bioretention 11 5.5 5.5

Impervious to Infiltration 34 0 34

Value of Intervention Types(inches per year per square foot conversion)

Value of Pilot ProjectsValue of Intervention Types(inches per year per square foot conversion)

Note:Impervious to Bioretention assumes 30% capture of the annual runoff from the road.

Documents

Panther Hollow Interventions