Philadelphia Water Department, Green Street Design Projects

Posted on July 7, 2014

Client: Philadelphia Water Department
Location: Philadelphia, PA
Project Period: 2011 to Present
Project Cost: $100,000 (Design Only)

Project Description

D&B is currently working on several Green Street projects for the Philadelphia Water Department (PWD) to design green infrastructure systems in various locations to alleviate stormwater runoff and promote water conservation. The projects include the design and the development of plans, specifications and construction cost estimates for stormwater trenches with tree pits and bump-outs. The projects are separated into two contracts, the PWD Green Streets and the Pennsport Green Street.

PWD Green Streets

This project includes three (3) separate locations throughout Philadelphia: the Cecil B. Moore Recreational Center on Sedgley Avenue, and HM Stanton School on 16th Street and Kenderton Field on American Street. The total drainage area calculated for this project is 3.03 acres. To promote water conservation and green infrastructure the Philadelphia Water Department seeks to capture and reuse the first inch and a half (1 ½ inch) of rainfall, equaling a total project runoff volume of 22,724 C.F. Ten (10) stormwater management systems, including nine (9) stormwater trenches with thirty-four (34) tree pits have been designed to achieve this goal. The stormwater trenches have been designed to include new 4 foot. green highway inlets, new green city inlets, 8” perforated distribution pipes, 8” underdrain pipes, tree pits, cleanouts, observation wells and domed risers.PWD---sw-bump-3               PWD---sw-bump-1    PWD---sw-bump-2 

At the Cecil B. Moore Recreation Center project location a total of five (5) stormwater trenches with sixteen (16) tree pits and three (3) bump-outs with native plants and shrubbery have been designed to make use of the 9,373 C.F. of runoff volume. At the HM Stanton School project location a total of two (2) stormwater trenches with five (5) tree pits have been designed to make use of the 2,115 C.F. of runoff volume. At the Kenderton Field project location a total of four (4) stormwater trenches with thirteen (13) tree pits have been designed to make use of the 5,130 C.F. of runoff volume.

Pennsport Green Street Project

The Pennsport Green Street Project includes Green Streets design at the following locations: Taggert School, St. Monica Manor, Sharswood School and Our Lady of Carmel School. The project includes the design of Green Street Storm Water Management program for the streets surrounding the schools and the development of plans, specifications and construction cost estimate. The total drainage area calculated for this project is 2.9 acres, and capturing and reusing the first inch and a half (1 ½ inch) of rainfall, results in a total project runoff volume of 14,459 C.F. Nine (9) stormwater management systems, including ten (10) stormwater trenches with nineteen (19) tree pits have been designed to achieve this goal. The stormwater trenches have been designed to include new 4 foot. green highway inlets, new green city inlets, 8” perforated distribution pipes, 8” underdrain pipes, tree pits, cleanouts, and observation wells to alleviate stormwater runoff and promote water conservation.

At the Sharswood School and Our Lady of Carmel School project location a total of five (5) stormwater trenches with eight (8) tree pits have been designed to make use of the 6,412 C.F. of runoff volume. At the Taggert School and St. Monica Manor project location a total of five (5) stormwater trenches with eleven (11) tree pits have been designed to make use of the 8,047 C.F. of runoff volume.

PWD---sw-tree-3

               PWD---sw-tree-1     PWD---sw-tree-2

Cecil B. Moore/Eyre/Marston Street Area Green Street Project

This project is for the design of porous paving to Marston, Eyre and Taney Streets in lieu of traditional impervious paving. The paving shall be curb line to curb line for the roadway width, and either to the last inlet or the house line along the roadway. The stone bed underneath is to be flat, and if it would cause excessive excavation, check dams will be designed. This will be lined with a 40 mil HDPE liner at the curb line to help prevent water from reaching basements. The system sizing shall be based on impervious area in R.O.W. of streets, with a total design 10,307 C.F. storage volume. Eleven (11) Trees will be added to the system.

Adams/Church St. Area Green Street Project

This project is for the design of a bump out and tree trench at the intersection of Adams Avenue and Church Street. A small bump out with native plants and shrubbery (reducing the radius to 15-25 feet) has been designed to reduce the amount of impervious surface at the intersection and manage stormwater. Also, along Adams Ave., a total of three (3) stormwater trenches with three (3) tree pits have been designed to make use of the 3,812 C.F. of runoff volume. The three (3) systems have been designed to capture and store 5,002 C.F. of runoff. Inlets, curb cuts, and a domed riser will collect the water, which will be routed into the tree trenches and bump-out.

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