GEORGIA STORMWATER MANAGEMENT MANUAL

GEORGIA STORMWATER MANAGEMENT MANUAL

Volume 1: Stormwater Policy Guidebook

First Edition ? August 2001

The development of this Manual was facilitated by the Atlanta Regional Commission. It was funded as a cooperative effort by the following agencies:

Atlanta Regional Commission Georgia Dept of Natural Resources

-- Environmental Protection Division Cherokee County Clayton County Cobb County DeKalb County Douglas County Fayette County Fulton County Gwinnett County Henry County Rockdale County Douglasville/Douglas Co. Water &

Sewerage Authority Athens-Clarke County Augusta-Richmond County Columbus-Muscogee County City of Acworth City of Albany

City of Alpharetta City of Atlanta City of Austell City of College Park City of Douglasville City of East Point City of Fairburn City of Griffin City of Hapeville City of Kennesaw City of Lithia Springs City of Marietta City of Palmetto City of Peachtree City City of Powder Springs City of Rome City of Roswell City of Smyrna City of Snellville City of Union City

This project was financed in part through a grant from the U.S. Environmental Protection Agency under the Provisions of Section 319(h) of the Federal Water Pollution Control Act, as amended.

Prepared by:

AMEC Earth and Environmental Center for Watershed Protection

Debo and Associates Jordan Jones and Goulding Atlanta Regional Commission

TABLE OF CONTENTS

FORWARD Preface .........................................................................................................ix Acknowledgements ....................................................................................ix

INTRODUCTION Objective of the Manual ..............................................................................xi Organization of the Manual.........................................................................xi Users of this Volume...................................................................................xi How to Use this Volume..............................................................................xii Regulatory Status of the Manual ................................................................xiii How to Get Printed Copies of the Manual..................................................xiii How to Find the Manual on the Internet.....................................................xiii Contact Information ....................................................................................xiii

CHAPTER 1 ? THE CASE FOR STORMWATER MANAGEMENT 1.1 Impacts of Development and Stormwater Runoff .............................1-1 1.1.1 Development Changes Land and Runoff...................................1-1 1.1.2 Changes to Stream Flow...........................................................1-2 1.1.3 Changes to Stream Geometry...................................................1-4 1.1.4 Impacts to Aquatic Habitat ........................................................1-5 1.1.5 Water Quality Impacts ...............................................................1-6 1.1.6 Stormwater Hotspots.................................................................1-8 1.1.7 Effects on Lakes, Reservoirs and Estuaries ..............................1-9 1.2 Stormwater Impacts on Georgia Communities .................................1-9 1.3 Addressing Runoff Impacts Through Stormwater Management ......1-12

CHAPTER 2 ? REGULATORY REQUIREMENTS FOR GEORGIA COMMUNITIES 2.1 Overview ..............................................................................................2-1 2.2 Stormwater Quantity and Flooding Prevention Regulations ............2-1 2.2.1 National Flood Insurance Program ............................................2-1 2.2.2 Georgia Safe Dams Act.............................................................2-1 2.3 Water Quality Regulations ..................................................................2-3 2.3.1 Municipal NPDES MS4 Stormwater Permit Program.................2-3 2.3.2 Industrial NPDES Stormwater Permit Program..........................2-4

Volume 1 (Policy Guidebook)

Georgia Stormwater Management Manual i

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