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Cobbs Creek Stream Restoration


Philadelphia, Pennsylvania<br style='line-height:2px'>Philadelphia Water Department

HAKS was a member of the team performing topographic and stream cross-section survey services for the Cobbs Creek Stream Restoration Project near the Woodland Avenue Dam for the Philadelphia Water Department. The 13-acre site consists of the mainstream channel of Cobbs Creek and the surrounding flood plain area in the City of Philadelphia. It starts 250 feet upstream of the CSX High Level Bridge, extends approximately 2,500 feet downstream, and ends 250 feet downstream of the intersection of Cobbs Creek and Woodland Avenue Bridge. Both sides of Cobbs Creek are within the project site, which is bordered to the east by Cobbs Creek Parkway and to the west by private properties in Darby and Yeadon Townships in Delaware County.

 HAKS collected the following information and presented it on our topography and stream survey plans:

  • Locations of buildings, bridges, endwalls, dams, concrete pads, light poles, fences, retaining walls, stream revetments, pavement and curb lines, as well as large boulders, bedrock outcrops, broken concrete piles/debris or dirt piles
  • Horizontal location and elevation of stream thalweg (deepest point in channel), with points collected along the flow path at 50-foot intervals and at angle points and bends
  • Tree survey for trees with larger than 12-inch-diameter breast height, within 10 feet of the bank tops of the main channel
  • Sanitary sewer manholes, storm sewer grates and manholes, headwalls and outfalls with elevations
  • For both the Woodland Avenue and Railroad Bridges: top width of bridge, upstream and downstream bridge openings, wing walls, abutments, and other features 

A baseline was established at the approximate center of the stream channel. Cross-sections were referenced perpendicular to this baseline. Perpendicular cross-sections were obtained every 100 feet along the baseline of Cobbs Creek. Elevations along cross-section lines perpendicular to the baseline extends to the top of existing bank on both sides, as well as at slope breaks and other topographic features. 

The fast-tracked survey work was performed to obtain the required data prior to the spring growth to enable the completion of the stream restoration design without delay.