Pennsylvania

Pennsylvania Stormwater Best Management Practices 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 Department of Transportation (PennDOT), Philadelphia

Document Metadata

Jurisdiction level

State

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State

Pennsylvania

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Version / edition

363-0300-002 / December 30, 2006

“363-0300-002 / December 30, 2006”
Title Page

Adoption / effective date

2006-12-30

“EFFECTIVE DATE: December 30, 2006”
Page i

Last revised date

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Relationship to state manual

independent

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Design Criteria

Design storm return periods (years)

1-year, 2-year, 100-year

“Do not increase the post-development total runoff volume for all storms equal to or less than the 2-year/24-hour event.”
Chapter 3, Section 3.3.3 Volume Control Guideline 1

Water quality volume method

Volume Control Guideline 1 (CG-1): do not increase post-development total runoff volume for storms ≤ 2-year/24-hour. Volume Control Guideline 2 (CG-2, sites ≤1 ac without storage facilities): capture first 2 inches from new impervious; permanently remove first 1.0 inch (reuse, evaporation, transpiration, infiltration), with at least 0.5 inch infiltrated where possible. Water quality performance goal: 85% reduction in TSS and total phosphorus loads and 50% reduction in NO3-N solute loads vs. post-development land use.

“Stormwater facilities shall be sized to capture at least the first two inches (2") of runoff from all contributing impervious surfaces. At least the first one inch (1.0") of runoff from new impervious surfaces shall be permanently removed from the runoff flow”
Chapter 3, Section 3.3.4 Volume Control Guideline 2

Peak flow calculation method(s)

Rational Method, SCS (NRCS) Unit Hydrograph Method, Runoff Curve Number Method, Small Storm Hydrology Method

“8.3.1 The Rational Method ... 8.3.2 SCS (NRCS) Unit Hydrograph Method”
Chapter 8 Table of Contents

Hydrologic/hydraulic software

WIN TR-20, WIN TR-55, Storm Water Management Model (SWMM)

“8.4.2 SCS/NRCS Models: WIN TR-20 and WIN TR-55 ... 8.4.4 Storm Water Management Model (SWMM)”
Chapter 8 Table of Contents

Approved BMP categories

Non-Structural Site Design BMPs, Pervious Pavement with Infiltration Bed, Infiltration Basin, Subsurface Infiltration Bed, Infiltration Trench, Rain Garden / Bioretention, Dry Well / Seepage Pit, Constructed Filter, Vegetated Swale, Vegetated Filter Strip, Infiltration Berm & Retentive Grading, Vegetated Roof, Runoff Capture & Reuse, Constructed Wetland, Wet Pond / Retention Basin, Dry Extended Detention Basin, Water Quality Filters & Hydrodynamic Devices, Riparian Buffer Restoration, Landscape Restoration, Floodplain Restoration, Level Spreader

“6.4 Volume/Peak Rate Reduction by Infiltration BMPs ... 6.5 Volume/Peak Rate Reduction BMPs ... 6.6 Runoff Quality/Peak Rate BMPs”
Chapter 6 Table of Contents