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(5) Setbacks from Watercourses. 418
(a) There shall be no new impervious ground cover constructed or erected within 200 ft. of the bank of a stream or within 50 ft. of the center line of a swale within the /WWO overlay district. Streams and Swales that have been buried in sewer or in embedded culverts, shall be excluded.
(b) For the purposes of this section, § 14-510 /WWO, Wissahickon Watershed Overlay District, the following terms are defined:
A tunnel, typically embedded so as to be surrounded by soil, carrying a stream or open drain under a road or railroad.
An underground conduit for carrying drainage water and waste material.