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Pennsylvania: Philadelphia (Penn Alexander School)
Green Infrastructure Type: Green Campuses
Types of Green Infrastructure Used: Porous Pavement, Bioretention, Infiltration Beds
Summary:
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Roof leaders from the Penn Alexaner School
connect to this rain garden |
Description:
The University of Pennsylvania and the School District of Philadelphia, in partnership with the Philadelphia Water Department, implemented green infrastructure practices to manage stormwater in the schoolyard design at the newly constructed Penn Alexander School. Through a grant obtained from the state, the Philadelphia Water Department designed three management practices to control runoff from the school, which included a subsurface infiltration bed beneath the playfield; a 5,000 square foot porous asphalt playground with subsurface infiltration; and a 1,400 square foot rain garden. The three practices were used to disconnect the runoff from the city's combined sewer system (CSS) and reduce the flow of stormwater to the CSS through on-site infiltration. Runoff collected from impervious surfaces at the site (i.e., school building) is directly conveyed through roof drains and drainage pipes to either to the subsurface infiltration bed or into the rain garden. Runoff collected is allowed to freely infiltrate the ground promoting groundwater recharge as well as providing moisture for the playing field, without the need for irrigation in dry periods. The infiltration bed beneath the porous playground receives overflow from the rain garden in addition to absorbing the rainfall that falls directly onto the playground. Overflows from the subsurface infiltration bed and porous playground are conveyed directly to the CSS. These practices applied in an urban setting have limited flooding, promoted groundwater recharge, provided biological habitats and provided environmental education opportunities for children.
For more information, visit: http://www.thcahill.com/penn.html  or http://webgui.phila.k12.pa.us/schools/p/penn-alexander
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