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.  

*Recent Updates to Stormwater Design Manual*

The DEQ Stormwater Program has recently made updates to the SCM chapters of the Stormwater Design Manual as well as relasing new versions of the O & M EZ and Supplement EZ tools. Below is a summary of the major changes:

  • The operation and maintenance sections of each chapter in Par C: Minimum Design Criteria and Recommendations for Stormwater Control Measures have been updated to use consistent language and address any changes required by the 2017 Rule update. 
  • Chapter C-2: Bioretention Cell - MDC 1 was corrected to remove the reference to forebay.
  • Chapter C-5: Permeable Pavement - 
    • MDC 2 was corrected to change the requirement for the water table to subside within five days to the property requirement that the soil profile will allow the design to infiltrate within 72 hours.
    • Erroneous language was eliminated from MDC 10.
    • Guidance was updated to improve clarity for MDC 4 (Soil Subgrade Slope), MDC 5 (Stone Base), and MDC 7 (Runoff from Adjacent Areas). 
  • Chapter C-6: Sand Filter - A table of contents was added.
  • Chapter C-9: Level Spreader - Filter Strip - MDC 10, which was previously missing, has been added to the chapter with guidance on meeting the requirements.
  • Supplement EZ - 
    • An option was added for projects that contain both areas of high and low density.
    • Various fields were renamed to clarify the information required in each field.
    • Various typos and errors were corrected. Fields that were improperly formatted were fixed to ensure that information can be entered properly.
  • O & M EZ - 
    • Maintenance requirements were revised to match the maintenance sections of each SCM in the Stormwater Design Manual.
    • A low density option was added to allow O & M EZ to be used for low density projects. 

Low Impact Development (LID) Guide

This guidebook is to provide technical and policy guidance to local and county government staff, building professionals, and consultants on low impact development principles and practices.

Phase II SCM Locations Map

This map shows the locations of SCM's in the Town of Black Mountain. 


Adopt-A-Stream is a flexible program that allows teams to contribute to a healthier watershed on their schedule. Each Adopt-A-Stream team is assigned a specific stretch of stream or river which they are responsible for cleaning at least 3 times per year.

Stormwater Management Brochure

Controlling Sedimentation and Erosion on Construction Sites Brochure

Construction Waste Management Fact Sheet


RiverLink promotes the environmental and economic vitality of the French Broad River and its watershed as a place to live, learn, work and play.

RiverLink accomplishes its mission by providing permanent public access to the river through conservation and recreation easements, reclaiming contaminated lands for public use and enjoyment, greenway development,  creating public overnight camping sites along the river, adaptive reuse of historic structures, educating  3,300 students K-12 annually as well as the public-at-large about the French Broad River watersheds’ importance  and empowering over 1,000 volunteers each year.

RiverLink was established in 1987 and is the only French Broad River watershed non-profit exclusively focused on the French Broad River.

US Army Corps of Engineers

The Wilmington District administers the Corps of Engineers regulatory permit program for waters and wetlands in North Carolina. The Wilmington District's Regulatory Program manages and protects North Carolina's aquatic resources through fair, flexible, and balanced permit decisions. Aquatic resources that we regulate include wetlands, rivers, stream channels, lakes, ponds and tidal waters.

There are two main federal laws that task the Corps of Engineers with the authority to regulate our nation's waterways: Section 404 of the Clean Water Act and Section 10 of the Rivers and Harbors Act of 1899.

NCDEQ (North Carolina Department of Environmental Quality)

The organization, which has offices from the mountains to the coast, administers regulatory programs designed to protect air quality, water quality, and the public's health, and also works to advance an all-of-the-above energy strategy that fits North Carolina’s needs. DEQ also offers technical assistance to businesses, farmers, local governments, and the public and encourages responsible behavior with respect to the environment through education programs provided at DEQ facilities and through the state's school system. 

EPA (Environmental Protection Agency)

Born in the wake of elevated concern about environmental pollution, EPA was established on December 2, 1970 to consolidate in one agency a variety of federal research, monitoring, standard-setting and enforcement activities to ensure environmental protection. Since its inception, EPA has been working for a cleaner, healthier environment for the American people. 

Surf Your Watershed

Learn the condition of local streams, lakes and other waters anywhere in the US... quickly and in plain language.  See if your local waterway was checked for pollution, what was found, and what is being done.  The source of this information is a US Environmental Protection Agency (EPA) database of State water quality monitoring reports provided under the Clean Water Act.


Learn about flood risk at a specific address, to include flood hazard, structural and content impacts, potential insurance rates, mitigation opportunities and the location of flood warning sites near you.

FIMAN (Flood Inundation Mapping and Alert Network)

This web site provides real-time data on stream elevation, rainfall and weather parameters from over 550 gages across North Carolina. Some sites may be rain or stage gages only while some may have weather data available. Many of these gages are managed by the Division of Emergency Management (NCDEM) while some are operated by local government agencies and private organizations. Additionally, gages from the U.S. Geological Survey are included in this network. 


Plan, prepare, stay informed. 

American Red Cross 

Each day, thousands of people – people just like you – provide compassionate care to those in need. Our network of generous donors, volunteers and employees share a mission of preventing and relieving suffering, here at home and around the world.

We roll up our sleeves and donate time, money and blood. We learn or teach life-saving skills so our communities can be better prepared when the need arises. We do this every day because the Red Cross is needed - every day.

FEMA (Federal Emergency Management Agency)

Helping people before, during, and after disasters.

Only Rain Down the Drain

Outreach program to assist with public education and outreach requirements for the Phase II Stormwater Permit.