Resource Rain

NOW IN EFFECT!

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

State Issued Permit NPDES Permit No. TNS068063
City Ordinance City Code, Chapter 31; Ordinance 12881, accepted November 25, 2014 (final is not published). See revised ordinance below.
Revised City Ordinance City Code, Chapter 31; Ordinance 13251, effective November 29, 2017

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

I&M Agreement Form for Unplatted Parcels

I&M Agreement Form for Platted Parcels

Annual I&M Form (2019)

Rainwater Management Guide (RMG)

Full RMG including Addendums 1 & 2 with revisions

Addendums

Addendum (Effective November 29, 2017)

Addendum #2 (Effective August 30, 2019)

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

Chapters

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

5.2.1.1 Preserving Landforms

5.2.1.2 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

5.2.4.1 Protect Historic or Specimen Trees

5.2.4.2 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

5.4.1.1 Naturalize Swales- Drainage

5.4.2 Improve Native Landscape Cover

5.4.2.1 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

Appendices

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 Buffers
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