RI Stormwater Management Rules & Guidance

Stormwater Management, Design, and Installation Rules (250-RICR-150-10-8) are now in effect. The purpose of these 2018 Rules is to recodify the Stormwater Manual into the Rhode Island Code of Regulations format as required by amendments to the Administrative Procedures Act (§ 42-35-5). This recodification followed a standard format used for all state regulations. The RI Stormwater Design and Installation Standards Manual was adopted in December 2010 following the standard rule-making process used by RI DEM and the Coastal Resources Management Council (CRMC). However, the Manual was not written in typical rule format, and a great deal of the Manual is not regulatory and in fact acts as guidance. Only those parts of the original Manual that are regulatory are included in the recodified “RI Stormwater Management, Design and Installation Rules” (“Stormwater Rules”). Regulatory language describes actions that the regulated public must do or must not do. As a result, background information, diagrams, photos, and most of the Appendices are not included in the recodified Stormwater Rules. In recodifying the Manual, the Department preserved the full intent of the original Manual requirements such that there will be no difference in how a stormwater system is designed and installed under the recodified Stormwater Rules. The Stormwater Design and Installation Standards Manual will be maintained as guidance and can still be used to design stormwater systems.

Applications and Forms

Primary Resources

Low Impact Development (LID) Guidance Documents:

Stormwater Analysis & Design Guidance Documents:

Questions about the Stormwater Manual? Contact Ernie Panciera at ernie.panciera@dem.ri.gov. For all other questions, email DEM.WaterResources@dem.ri.gov. To schedule a pre-application meeting to discuss a specific project, please contact the Office of Customer and Technical Assistance at 222-6800.


DEM and CRMC, in conjunction with the University of Rhode Island, held a series of public training sessions to help acquaint users with the new manual. Further information about the training sessions is available at web.uri.edu/riss/.

January 13, 2011
Stormwater Manual Training Part 1: Using the Revised Manual

1. Why Update the Manual?
2. Minimum Standards
3. How to Use the Manual
4. Low Impact Development Planning & Design
5. Acceptable BMPs
6. Design Exercises
7. Single Family Individual Lot Design Options

January 19, 2011
Stormwater Manual Training Part 2: BMP Construction and Maintenance

1. Why Proper Installation is Important
2. Design Elements for BMPs
(down for maintenance)
(down for maintenance)
5. Proper Erosion and Sediment Controls to Protect BMPs
6. Importance of Maintenance
7. Typical Routine and Long-term Maintenance Measures
8. Vegetation Management and Maintenance
9. Maintenance Exercise
10. Typical Maintenance Costs

March 22, 2011
Stormwater Manual Training Part 3: Design Considerations and Case Studies

1. Required Management Volume Calculations and Redevelopment Considerations
2. QPA Requirements/Credits
3.BMP Design - Critical Elements
4.Design Example: Residential Subdivision
5.Case Study: Redevelopment/Infill

March 24, 2011
Stormwater Manual Training Part 4: Design Considerations and Case Studies

1.Recap of Practices
2.Material Specifications and Measures for WVTS Construction and Maintenance
3.Infiltration (Including Permeable Paving)
4.Construction and Maintenance Summary

In some cases, the certain elements of a Minimum Standard would not be applicable to the single-family residential project or the requirement would be an undue burden compared to the scale and impact of the project. In an effort to reduce the burden of the new regulations on single-family homeowners and encourage land use practices that meet RIDEM's stormwater treatment goals.

Accordingly, both DEM and CRMC have developed Rhode Island Stormwater Management Guidance for Individual Single-Family Residential Lot Development. All applicants may also elect to fully comply with all minimum standards and performance criteria outlined in the RISDISM if they wish, or utilize the RISDISM for further guidance.