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MS4 & Post-Construction Stormwater Management

Home Responsibility Matters Clean Water MS4 & Post-Construction Storm Water Management

MS4 Program and Stormwater Management Initiatives

  • Clean Water
  • MS4
  • Stormwater Compliance
  • Clean Water Contact
  • Clean Water Initiative

MS4

Municipal Separate Storm Sewer Systems (MS4s) are systems made up of storm inlets, pipes, ditches, swales, and stormwater basins that collect and transport runoff from stormwater. They work to manage the flow of water and reduce pollutants such as sediment.

Stormwater drain in the ground
Stormwater runoff basin
Drainage channel by PA Turnpike tunnel

Post-Construction Stormwater Management

It’s important to manage stormwater runoff even after construction has ended. Without as much soil to absorb water as groundwater, developed land can usher water into a stream or body of water more quickly. The NPDES program requires a Post-Construction Stormwater Management (PCSM) plan to demonstrate how this increased stormwater runoff will be managed to mimic or reduce the pre-construction conditions.

Tactics include permanent Best Management Practices (BMPs) such as:

  • Inlets: Stormflows are collected by these inlets and the water is delivered through pipes to control roadway runoff and reduce roadway flooding.
  • Drainage Pipes, Ditches, and Swales: These transport runoff to stormwater basins.
  • Stormwater Control Measures (SCMs): SCMs retain or reduce runoff, collect sediment, or infiltrate stormwater back into the ground for natural filtering.

Stormwater Data Viewer:

The PA Turnpike's currently available stormwater data can be viewed using this web-based mapping application. PA Turnpike-adjoining municipalities are highly encouraged to use this application to assist with tracking of potential illicit discharges. To report a potential illicit discharge, please use the PA Turnpike's Clean Water Contact Form.

Stormwater Data Viewer

How you can help keep Pennsylvania’s water cleaner:

To report a stormwater-related issue or concern on the Turnpike, please click on the link below to fill out the Clean Water Contact Form.

Clean Water Contact Form

MS4 Resources

See the resource links below to learn more about the Turnpike’s Municipal Separate Storm Sewer System.

Online Resources

Resource Links

  • PA DEP – MS4 FAQ

Turnpike MS4 and Post-Construction Stormwater Management Manuals

Resource Links

  • PA Turnpike Commission Illicit Discharge Detection & Elimination (IDD&E) Program Manual
  • PA Turnpike Commission Stormwater Control Measure Operations and Maintenance Manual
  • PA Turnpike Commission Maintenance Manual
  • PA Turnpike Commission Foreman’s Manual
  • Be Stormwater Smart

MS4 Documentation

Resource Links

  • Ohio River Watershed Pollutant Reduction Plan
  • Chesapeake Bay Watershed Pollutant Reduction Plan
  • Delaware River Watershed Pollutant Reduction Plan
  • PA Turnpike MS4 Permit
  • PA Turnpike MS4 Permit Fact Sheet

Photo Gallery

swale

Swale

swale

Swale

swale

Swale

stormwater inlet grate

Stormwater inlet grate

Stormwater inlet grate

Stormwater inlet grate

stormwater outlet

Stormwater outlet

stormwater outlet below roadway

Stormwater outlet below roadway

stormwater outlet

Stormwater outlet

stormwater basin next to roadway

Stormwater basin next to roadway

stormwater basin near woods

Stormwater basin near woods

Stormwater runoff basin

Stormwater runoff basin

Pennsylvania stream

Pennsylvania stream

Drainage channel near turnpike tunnel

Drainage channel near turnpike tunnel

Stormwater drain under roadway

Stormwater drain under roadway

Stormwater drain

Stormwater drain

Stormwater runoff basin

Stormwater runoff basin

Erosion control structure

Erosion control structure

Erosion control structure

Erosion control structure

swale
swale
swale
stormwater inlet grate
Stormwater inlet grate
stormwater outlet
stormwater outlet below roadway
stormwater outlet
stormwater basin next to roadway
stormwater basin near woods
Stormwater runoff basin
Pennsylvania stream
Drainage channel near turnpike tunnel
Stormwater drain under roadway
Stormwater drain
Stormwater runoff basin
Erosion control structure
Erosion control structure

More Clean Water Resources

See the resource pages below to learn more about the Turnpike’s Municipal Separate Storm Sewer System (MS4), Post-Construction Stormwater Management, and Construction Stormwater Compliance initiatives.

Clean Water

The Pennsylvania Turnpike Commission is dedicated to our Clean Water initiative aimed at improved protection of the streams and rivers that pass beneath or near the PA Turnpike.

Learn More

Construction Stormwater and Compliance Management Plan

Find out more on how stormwater is managed on construction sites to control sediment and erosion.

Learn More

Clean Water Contact

To report a stormwater-related issue or concern from the Turnpike, please click on the link below to fill out the Clean Water Contact Form.

Learn More

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