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PRP/TMDL Plans

REQUIREMENTS

Pollutant Reduction Plan Instructions (PDF)

TMDL Plan Instructions (PDF)

To assist MS4s with understanding their obligations regarding impaired waters, DEP has prepared an MS4 Requirements Table. The Table consists of two parts – one for Municipal MS4s (PDF) and one for Non-Municipal MS4s (PDF). See also the MS4 Requirements Table Instructions (PDF) for understanding and using the Table and for methods to provide comments.

DEP has developed a supplement to the MS4 Requirements Table which is titled Pollutant Aggregation Suggestions for MS4 Requirements Table (PDF) (the Aggregation Table). The Aggregation Table helps permittees interpret the content of the MS4 Requirements Table by grouping the impaired surface waters into separate watersheds. See the Pollutant Aggregation Suggestions for MS4 Requirements Table Instructions (PDF) and FAQ (#17) for further explanation.

DEP has also developed a web-based GIS application that provides an improved visual representation of the information contained in the MS4 Requirements Table and the Aggregation Table.

RESOURCES

Pollutant Reduction Plan Mapping Basics: This web-based training will assist MS4 permittees with developing mapping for their Pollutant Reduction Plans.

This course “Pollutant Reduction Plan Mapping Basics” is available for guest access in the Clean Water Academy.  To access the course please follow the steps below.   MS4 users should only use GUEST access.  

  1. Click on the PA Clean Water Academy link
  2. Click on the” LOG IN AS A GUEST”
  3. Click on Course Catalog
  4. Click on the Course called “Pollutant Reduction Plan Mapping Basics”

To access PA Clean Water Academy, click on this link:
https://pacleanwateracademy.remote-learner.net/login/index.php

PRP Development Process Summary (PDF): This is a one-page step-by-step suggested approach for developing Pollutant Reduction Plans

Considerations of Stream Restoration Projects (PDF): This is a short description of what constitutes a "qualifying" MS4 stream restoration.

DEP's Recommendations for Considering, Selecting and Financing Cost-Effective Stormwater Best Management Practices (BMPs) to Achieve Pollutant Load Reductions (PDF) offers suggestions on how to get started with developing PRP/TMDL Plans.

EPA TMDL website

DEP TMDL Tool
DEP tool for looking up TMDLs in PA watersheds by different parameters

DEP Pennsylvania Stormwater Best Management Practices Manual
(363-0300-002)

Simplified Method Narrative (Word)
This paper describes methods that can be used to calculate existing pollutant load and the load reductions from BMPs.

MODELS

EPA National Stormwater Calculator
This calculator may be used to compute small site hydrology for any location within the US by estimating the amount of stormwater runoff generated from a site under different development and control scenarios over a long term period of historical rainfall.

EPA Stormwater Management Model
A dynamic rainfall-runoff simulation model used for single event or long-term (continuous) simulation of runoff quantity and quality from primarily urban areas.

ArcView Generalized Watershed Loading Function (AVWGLF)/MapShed Model
Detailed pollutant loading tools developed by Penn State.

Mapshed Tutorials Download page

PLANNING TOOLS

Statewide MS4 Land Cover Estimates (PDF)
This document contains percent impervious and pervious cover, both inside and outside of urbanized areas, for each municipality with an MS4 in PA, which may be used to develop pollutant loading estimates for Pollutant Reduction Plans and TMDL Plans.

PA Stormwater Manual DRAFT Compliance Spreadsheet (XLSX)
Use of the Chesapeake Bay Performance Standards curves to calculate BMP pollutant load removals requires an estimate of the stormwater pre-to-post development volume increase. The pre-to-post volume increase is most easily calculated using this spreadsheet.

Expert Panel Reports
Final CBP Approved Expert Panel Report on Stormwater Performance Standards (Long Version) (PDF)

Final CBP Approved Expert Panel Report on Stormwater Retrofits (Long Version) (PDF)

Final Recommendations of the Expert Panel to Define Removal Rates for Individual Stream Restoration Projects (Long Version) (PDF)

Recommendations of the Expert Panel to Define Removal Rates for Street and Storm Drain Cleaning Practices (Long Version) (PDF)

PA Urbanized Area Population Table (PDF)

DEP Pennsylvania Stormwater Best Management Practices Manual
(363-0300-002)

ADDITIONAL RESOURCES

  • Quick Resource Guide for Winter Maintenance BMPs (PDF)
    Educational booklet from the Southwestern Pennsylvania Commission (SPC) Water Resource Center to provide information to municipalities on how to improve winter maintenance operations
  • The Latest Evolution of Stormwater (PDF) (PA Township News March 2017)
    An informative article on the preparation of Pollutant Reduction Plans with commentary from local government officials, consultants and DEP.