Stormwater Manual (SWM)

The Stormwater Manual table of contents is listed below with links to various sections of the document. Questions about content and requirements may be directed to Virginia Spillman or Mike Borchers in the Stormwater Management Division of Water Resources. Call them at (336) 373-2055 or email them.

SWM Cover Page (pdf)

SWM Table of Contents (pdf)

SWM - Section 1 - Introduction (pdf) 
1.1. Purpose
1.2. Need For Stormwater Management
1.2.1 Effects of Urbanization on Watershed Hydrology
1.2.2 Stormwater Management Regulations and Policies

SWM - Section 2 - Stormwater Management Requirements (pdf)
2.1 City of Greensboro Stormwater Master Plans
2.2 Stormwater Management Plan
2.2.1 Stormwater Management/Watershed Development Plan Components
2.3 Stream Protection Requirements
2.3.1 Stream Channelization/Piping Restrictions
2.3.2 Stream Buffers
2.4 Stormwater Quality and Quantity Control
2.4.1 Quality Control for High Density Development in Water Supply Watershed Areas
2.4.2 Quantity Control
2.4.3 Hydraulic/Hydrologic Methods
2.4.4 Engineer’s Certification Note of Stormwater Quantity Control
2.5 Modifications to Stormwater Requirements
2.5.1 Water Supply Watershed Protection
2.5.2 Stormwater Management Control

SWM - Section 3.1 - Overview of Stormwater BMPs (pdf)
3.1.1 Pollution Prevention BMPs
3.1.2 Stormwater Quality/Quantity BMPs

SWM - Section 3.2 - Pollution Prevention BMPs (pdf)

3.2.1 Employee Education
3.2.2 On-Site Refuse Management
3.2.3 Stormwater System Maintenance
3.2.4 Paved Area Sweeping
3.2.5 Used Oil Recycling
3.2.6 Covering
3.2.7 Spill Containment
3.2.8 Soil Erosion Control

SWM - Section 3.3 - Non-Structural BMPs (pdf)
3.3.1 Open Vegetated Conveyance
3.3.2 Stream Buffers
3.3.3 Disconnect Rooftop Drainage
3.3.4 Clustering/Conservation of Natural Areas
3.3.5 Grass Paving
3.3.6 Natural Infiltration

SWM - Section 3.4  - Structural BMPs (pdf)
3.4.1 Introduction
3.4.2 Structural BMP Selection Guidelines
3.4.3 Control Volumes
3.4.4 Stormwater Utility Credit
3.4.5 Regulatory Considerations
3.4.6 Grass Swales
3.4.7 Filter Strips
3.4.8 Dry Detention Basins
3.4.9 Wet Detention Ponds
3.4.10 Stormwater Wetlands
3.4.11 Bioretention Areas
3.4.12 Sand Filtration Facilities
3.4.13 Proprietary Stormwater Treatment Facilities

SWM - Section 3.5  - Structural BMP Installation Guidelines
3.5.1 Introduction
3.5.2 Grass Swales, Filter Strips
3.5.3 Dry Detention Basins and Wet Detention Ponds
3.5.4 Stormwater Wetlands
3.5.5 Bioretention Areas
3.5.6 Sand Filtration Facilities
3.5.7 Proprietary Stormwater Treatment Facilities

SWM - Section 3.6 - Structural BMP Maintenance and Inspection Guidelines
3.6.1 Introduction
3.6.2 BMP Maintenance Requirements
3.6.3 General Maintenance Guidelines
3.6.4 Grass Swales, Filter Strips
3.6.5 Dry Detention Basins, Wet Detention Ponds,Stormwater Wetlands
3.6.6 Bioretention Areas
3.6.7 Sand Filtration Facilities
3.6.8 Proprietary Stormwater Treatment Facilities

SWM - Glossary

SWM - References and Resources
 
SWM - Appendix A
Amended Chapter 30 Ordinance – Randleman Lake Watershed Protection Requirements (effective January 1, 2000)
Map of the Greensboro Water-Supply Watershed
Map of the Greensboro Water-Supply Watershed Critical Area

SWM - Appendix B: Amended Section 27 (effective April 2000)

SWM - Appendix C
Precipitation Distribution Table
Depth-Duration-Frequency Table, Intensity-Duration-Frequency

SWM - Appendix D: Example of Pond Detention Computations

SWM - Appendix E: Dr. H.R. Malcom’s Preliminary Basin Design

SWM - Appendix F: Dam Safety NC Administrative Code Title 15A Subchapter 2K,
(Amended 1995)


SWM - Appendix G: Example Wetland Plantings

SWM - Appendix H: Example Trash Protection for Low Flow Orifices

SWM - Appendix I: Example Calculation Method for Orifice Drawdown Time

SWM - Appendix J: Description of Filter and Drainage Diaphragm for Seepage Control
(Source: NRCS)


SWM - Appendix K: Sample BMP Inspection and Maintenance Checklists

SWM - Appendix L: Preliminary Estimates of Capital Costs of Stormwater Ponds for Quantity
and Combined Quantity and Quality Control