View Our
Facebook Page!

Report Fraud, Waste,
and Abuse

Online Services Payments, GIS Maps, Tax Information
Contact Department contacts, Reports and Requests

Resource Rain

Resource-Rain Logo- compressed




What is Resource Rain?

New policies, ordinances, and codes relating to rainwater management and water quality went into effect on December 1, 2014 for the City of Chattanooga to comply with the provisions of the NPDES MS4 Permit from the state of Tennessee. Essentially, many new and redevelopments will have to capture and infiltrate more rain on site than ever before.


State & City Permits & Ordinances Driving Resource Rain


What is the Rain Management Guide?

The Rain Management Guide, or RMG provides stormwater management measures and methods designed to assist with the preservation and restoration of natural hydrologic regimes, to minimize combined sewer overflows, and to improve the City's water quality. These changes will have a lasting impact on our community.   

ASCE EWRI Stormwater Regulations May 7th Seminar presentations are at the bottom of the page. 


 For more in depth information regarding the RMG, click the FAQ below

Frequently Asked Questions


I&M Forms For Private Stormwater Management Facilities


Rainwater Management Guide (RMG)



Addendum (Effective November 29, 2017)

Addendum #2 (Effective August 30, 2019)

Addendum #2 Revision #1 (Effective November 15, 2019)



Chapter 1  Introduction

Chapter 2  Use of the Manual

Chapter 3  Stormwater Management Performance Standards

Chapter 4  Integrating Stormwater Management

Chapter 5 Stormwater Management Practices

5.1  Introduction

5.2.1  Protect Undisturbed and Healthy Soils  Preserving Landforms  Protect Erodible Soils

5.2.2  Protect and Incorporate Natural Flow Paths

5.2.3  Protect and Preserve Riparian Corridors 

5.2.4  Protect and Preserve Natural Vegetation  Protect Historic or Specimen Trees  Soil-Plant Salvage

5.3.1  Pervious Pavement

5.3.2  Infiltration Bed

5.3.3  Infiltration Trench

5.3.4  Bioretention

5.3.5  Vegetated Swales

5.3.6  Vegetated Filter Strip

5.3.7  Infiltration Berm

5.3.8  Green Roofs

5.3.9  Runoff Capture- Reuse

5.3.10  Disconnected Impervious Areas

5.3.11  Stormwater Planter Box

5.3.12  Manufactured Devices

5.3.13  Naturalized Basins

5.4.1  Recreate Natural Flow  Naturalize Swales- Drainage

5.4.2  Improve Native Landscape Cover  Change Cover Type

5.4.3  Amend Restore Disturbed Soils

5.5.1  Street Sweeping

Chapter 6  Technical Guidelines Special Areas

Chapter 7  Calculations and Methodology

Chapter 8  Maintenance and Performance



Appendix A- Protocol 1

Appendix B- Protocol 2

Appendix C- Protocol 3

Appendix D- Protocol 4

Appendix E- Protocol 5

Appendix F- System Specs

Appendix G- Concept Review Meeting Application

Appendix H- Checklists

Appendix I- Construction Oversight Certification

Appendix J- Post-Construction Inspection Certification

Appendix K- Detailed Calculations Example and LID Calculation Tool

LID Calculation Tool (Revised November 29, 2017)

Authorized Agent Affidavit

        Stay-On Volume (SOV) Infeasibility Application (New November 29, 2017)


Credit & Incentives



RMG Education Sessions


ASCE-EWRI City of Chattanooga Stormwater Seminar, May 7th, 2015

The American Society of Civil Engineers Tennessee chapter of the Environmental and Water Resourcfes Institute sponsored a one day seminar on City stormwater regulations so that the development community can further understand the regulations and requirements.

ASCE-EWRI Chattanooga Stormwater Ordinances and Regulations
ASCE-EWRI Protecting Green Infrastructure during Construction
ASCE-EWRI What are Mitigating Circumstances?
ASCE-EWRI Geotechnical and Infiltration Testing
ASCE-EWRI Local Project Examples (for downloading) 
ASCE-EWRI Local Project Examples (for viewing on the internet)
ASCE-EWRI Stormwater Plans Review Process
ASCE-EWRI Stormwater Management within the Combined Sewer Area
ASCE-EWRI Stormwater Credits & Incentives


Contact Us

Department of Public Works

Development Resource Center

1250 Market Street, Suite 2100

Chattanooga, TN 37403

Chattanooga Water Quality Program
(423) 643-5877 . Mo Minkara, Ph.D., P.E. Manager Water Quality

Chattanooga Engineering
(423) 643-5961 . Maria Price, PE, M. ASCE Engineering Manager - Stormwater

Regional Planning Agency
(423) 643-5900 . John Bridger, Executive Director


Return to Water Quality Home



Water Quality Program
Mo Minkara, Ph.D.
P.E. Manager Water Quality
(423) 643-5877 

Chattanooga Engineering
Mark Heinzer, P.E., LEED AP, CPESC
CMS4S Site Development Manager
(423) 643-5800

Regional Planning Agency
Sarah Weeks
Senior Planner

Stormwater Division

1250 Market Street, Suite 2100
Chattanooga, TN 37403
(423) 643 - 5877

To report an issue please call 311 at 423-643-6311

Click here to view information on the proposed FEMA Floodplain Map Update

Check Mocassin Bend Wastewater Treatment Plant Information for sanitary sewer information

Photo by Phillip Stevens and Matt Lea