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Resource Rain

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What is Resource Rain?

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

The Rain Management Guide (RMG) that details the permit process and all associated actions is linked below by section with forms and calculation sheets at the end.  Here is the basic process for getting the Land Disturbing Permit (LDP) and it is also posted below.

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


Frequently Asked Questions


The Permit  NPDES Permit No. TNS068063 

The Ordinance  City Code, Chapter 31;   Ordinance 12881, accepted November 25, 2014  (final is not published).  See revised ordinance below.

Revised Ordinance  City Code, Chapter 31;  Ordinance 13251, effective November 29, 2017

Inspection and Maintenance Agreement Forms for Private Stormwater Management Facilities

I&M Agreement Form for Unplatted Parcels

I&M Agreement Form for Platted Parcels



Rainwater Management Guide

Addendum (Effective November 29, 2017)

Addendum #2 (Effective August 30, 2019)

Addendum #2 Revision #1

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

Credits & Incentives Manual

Calculation Tools


RMG Education Sessions
BMP Maintenance 
Permitting, Construction and As-Builts
RMG Brief and Credits & Incentives


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 . Sarah Weeks Senior Planner


Return to Water Quality Home



Serve people with integrity and improve the infrastructure and environment through excellence.

Justin Holland, Administrator
1250 Market Street
Chattanooga TN 37402 (map)
(423) 643-6311



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