Stormwater Design Manual

The Stormwater Design Manual is compatible with the Minimum Design Criteria (MDC) that are codified in the stormwater rules, which went into effect on Jan. 1, 2017.  The Stormwater Program will periodically update the Manual to provide better guidance on meeting the stormwater rules.  

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Comment on the Design Manual and Related Forms


Supplement EZ form (3/29/2017)

O&M EZ form

Training and SCM Crediting

Welcome to the MDC Workshops: NCSU and DEQ are cooperating to offer 1.5-day workshops on the MDC if you would like an intensive training on the new rules and manual. 

Stormwater Reviewer Certification: The expiration dates for all certifications have been extended until September 1, 2017.  People seeking Stormwater Reviewer Certification for the first time should attend a Welcome to the MDC Workshop. 

Final Stormwater Control Measure Credit Document (8/7/2017):  This document lists all SCM credits together facilitate comparisons between different SCMs for the regulated community. It is a joint effort between DEQ’s Stormwater and Nonpoint Source Planning programs.

Stormwater Design Manual Table of Contents

Part A: Common Site and SCM Elements

A-0.     Areas of Research Needed (11/9/2017)

A-1.     Runoff Treatment & Volume Match  (4/3/2017)

A-2.     Soils (4/3/2017)

A-3.     Vegetation (4/3/2017)

A-4.     Common Structures and Materials (3/8/2017)

A-5.     Construction  (3/8/2017)

A-6.    Operation and Maintenance  (3/8/2017)

A-7.    Guidance on SCM Selection  (3/8/2017)

Part B: Calculations Guidance   (3/15/2017)

Part C: Minimum Design Criteria and Recommendations for Stormwater Control Measures

C-0.     MDC for all SCMs  (1/3/2017)

C-1.     Infiltration System (1/3/2017)

C-2.     Bioretention Cell (4/5/2017)

C-3.     Wet Pond (4/17/2017)

C-4.     Stormwater Wetland (1/3/2017)

C-5.     Permeable Pavement  (4/6/2017)

C-6.     Sand Filter  (1/3/2017)

C-7.     Rainwater Harvesting  (8/11/2017)

C-8.     Green Roof (3/13/2017)

C-9.     Level Spreader-Filter Strip (1/3/2017)

C-10.   Disconnected Impervious Surface (1/3/2017)

C-11.   Treatment Swale (1/3/2017)

C-12.   Dry Pond (1/3/2017)

Part D: Minimum Design Criteria and Recommendations for New Stormwater Technologies

D-1.     StormFilter  (1/3/2017)

D-2.     Silva Cell Suspended Pavement with Bioretention (8/7/2017)

Part E: Guidance for Specific Types of Sites

E-1.     Low Density  (7/21/2017)

E-2.     Single Family Homes with BUA Limits (4/6/2017)

E-3.     Retrofits (1/3/2017)

E-4.     Airports (3/8/2017)

E-5.     Linear Transportation and Greenways (1/3/2017)

E-6.     Solar Farms (4/5/2017)

Part F:  Guidance for New Stormwater Technologies (4/17/2017)


MDC Team: Documents all of the discussions from the stakeholders group that developed the new Minimum Design Criteria