Philadelphia

Philadelphia Stormwater Management Guidance Manual

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Other manuals in Pennsylvania: City of Allentown, City of Erie, City of Harrisburg, City of Lancaster, City of Lancaster, City of Pittsburgh, City of Reading, City of Scranton, Pennsylvania, Pennsylvania, Pennsylvania Department of Transportation (PennDOT)

Document Metadata

Jurisdiction level

City

“The City of Philadelphia is required, by a series of State and Federal regulations and mandates, to clean up its waterways.”
Introduction, Page 10

State

Pennsylvania

“Professional Engineer licensed in the Commonwealth of Pennsylvania”
Chapter 2, Page 23

Version / edition

Version 3.4

“alterations including the conversion of pervious areas to impervious cover without authorization from PWD. It does not require the property owner to construct the SMPs if the development project associated with the SMPs does not commence or if no earth disturbance take”
p. 76

Adoption / effective date

Not found in document

No evidence cited

Last revised date

Not found in document

No evidence cited

Relationship to state manual

independent

“The Philadelphia Stormwater Management Guidance Manual (the Manual, or SMGM) is a comprehensive resource for the development community in complying with the Philadelphia Water Department (PWD) Stormwater Regulations (Stormwater Regulations) and designing stormwater management on private property.”
Introduction, Page 1

Design Criteria

Design storm return periods (years)

1-year, 2-year, 5-year, 10-year, 25-year, 50-year, 100-year

“Return period DURATION 1 yr 2 yr 5 yr 10 yr 25 yr 50 yr 100 yr”
Chapter 3, Page 100, Table 3.4-3

Water quality volume method

Infiltration of the first 1.5 inches of runoff from all directly connected impervious areas (DCIA) within the limits of earth disturbance.

“The Water Quality requirement stipulates infiltration of the first 1.5 inches of runoff from all directly connected impervious areas (DCIA) within the limits of earth disturbance. This quantity of stormwater runoff is referred to as the Water Quality Volume (WQv).”
Chapter 1, Page 15

Peak flow calculation method(s)

NRCS Curve Number Method, Rational Method

“The NRCS Curve Number Method is used to estimate site stormwater runoff from a given storm. ... The Rational Method may be used when designing storm sewers.”
Chapter 3, Page 98 & Page 95

Hydrologic/hydraulic software

Not found in document

No evidence cited

Approved BMP categories

Bioinfiltration/Bioretention, Porous Surfaces, Green Roofs, Subsurface Infiltration, Cisterns, Blue Roofs, Ponds and Wet Basins, Subsurface Detention, Media Filters, Blue-Green Roofs, Drainage Wells

“This chapter consists of guidance and requirements for the following SMPs: Section 4.1 – Bioinfiltration/Bioretention Section 4.2 – Porous Surfaces Section 4.3 – Green Roofs Section 4.4 – Subsurface Infiltration Section 4.5 – Cisterns Section 4.6 – Blue Roofs Section 4.7 – Ponds and Wet Basins Section 4.8 – Subsurface Detention Section 4.9 – Media Filters Section 4.14 – Blue-Green Roofs Section 4.15 – Drainage Wells”
Chapter 4, Section 4.0.2, Page 2