Rivers in a changing world

he history of Philadelphia’s water lies mostly underground, buried and dormant. Watershed maps show a slow and persistent erasure of the streams that once covered the city, branching capillaries that stretched from Chestnut Hill to South Philadelphia. In West Philadelphia, an uncovered stream remains: Cobbs Creek, where 11 Penn students and 14 high school students from William L. Sayre High School gather on a mild morning for Rivers in a Changing World, an Academically Based Community Service (ABCS) class coordinated by the Netter Center for Community Partnerships. It is taught by Douglas J. Jerolmack, of the School of Arts & Sciences and the School of Engineering and Applied Science, in collaboration with LaRon Smith, a ninth-grade science teacher at Sayre.

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