Stormwater

Stormwater is runoff generated when rain (or the occasional snowmelt) flows over the ground.

Dunwoody Nature Center Pond Wall

Impervious surfaces like driveways, sidewalks, and streets prevent stormwater runoff from naturally soaking into the ground.

With roughly 50 inches of rain each year, the City proactively manages our stormwater through a series of 10,289 structures and 8,377 conveyances (pipes) that convey the stormwater into our streams, creeks, and ponds.

To get a better understanding of what the Stormwater Department oversees and manages, please read the Dunwoody Stormwater Extent of Service document.

Check out what we've done so far! 

Improving Water Quality

Stormwater is also very important as it relates to the quality of the water in our natural streams. As the stormwater flows over the streets, sidewalks, driveways, and parking lots it picks up and carries pollutants (like oil, lawn fertilizers, and litter) to our streams, creeks, and ponds. The City needs your help in order to improve our water quality and protect our natural water resources.

The City's Stormwater Management Plan provides details on all the Best Management Practices (BMPs) the City uses to be compliant with EPD's standards for municipal stormwater.

Be Part of the Solution to Stormwater Pollution

You can help improve Dunwoody’s water quality and protect our water resources in many ways:

 

Riprap Program

NOTICE: Beginning January 1, 2019, the City of Dunwoody will discontinue its Riprap Assistance Program. Various property laws and regulatory requirements regarding Waters of the State could be violated when altering a channel or stream.  By providing riprap to property owners for this activity, a significant liability is assumed on behalf of the City.  For questions regarding this change to the Riprap Program, please contact the Public Works Department at 678-382-6850.

The City of Dunwoody supports your decision to reduce erosion, and would like to assist by providing rock.  In order to protect our environment and ensure proper use of municipal assets, the Public Works and Community Development departments require a signed Rock Request Application and Environmental Affidavit.  The placement of rock within streams is a regulated process and will require permitting in many circumstances.  For more information, please contact Public Works at 678-382-6850.


Dunwoody's Local Streams

 

The City of Dunwoody is located in the Upper Chattahoochee Watershed and has 9 individual drainage basins. Click here to make your own maps of Dunwoody.

The City of Dunwoody has 9 individual drainage basins.


Links
Educational Resources
EPA
USGS
Other

Stormwater Activity

Mind the Leaves to Help Our Waterways - Fall/Winter 2018

Help protect our storm system and streams by keeping the leaves out. Leaves and debris can build up and adversely affect the wildlife that lives in and around the streams.

Cooler temperatures are on the way. This is a delight for many residents as they spend more time outside enjoying the fall weather and crisp days of autumn. Cooler temperatures also mean leaves have begun to change and fall, creating a bit of extra work for everyone.

The City of Dunwoody Public Works Department would like to give you some ideas about what to do with the leaves now that they have hit the ground. 

Because leaves are a good source of mulch, the best thing to do is to rake or blow the leaves into natural areas. This will keep the ground moist which is good for growing plants and shrubs, as well as preventing erosion of the soil. Bare soil is very susceptible to erosion by water so the more it is kept covered, the less erosion will take place. Keeping the ground covered with leaves will also prevent weed growth as the weeds will not have soil to root into.

Ideally, leaves should be used on the property where they fall in order to return nutrients to the ground through composting. However, most properties will have more leaves fall than can be used on their property, so another method of disposal must be used. DeKalb County Sanitation will pick up bagged leaves as long as they are in biodegradable bags and each bag does not weight more than fifty pounds. DeKalb County will recycle these leaves to create mulch and compost that is made available to the public at no cost.

Leaves should never be disposed of by being blown into the street. Not only can this be an eyesore for the neighborhood, it can also wreak havoc on the City's storm drains. Once in the street, leaves will eventually be washed into the storm drain system where they can cause clogging and even flooding of the system. When the leaves eventually pass through the system, they can cause sediment and debris build-up in ditches and creeks. This buildup can adversely affect the wildlife that lives in and around the streams.

Some landscape companies will blow the leaves and yard debris into ditches and the storm system. These companies are the biggest contributor to this problem of leaves getting into the storm system and streams. Blowing leaves into the storm system is a violation of both City and State ordinances. Please do your part to help protect our city's assets by reporting these violations. Once reported, the Code Enforcement Officers for the City will cite those responsible and have them make the necessary corrections.

Composting leaves and yard debris is an easy and effective way to transform the seasonal debris into nutrient-rich, water-saving, soil-enhancing material. The practice of composting also reduces the volume of yard waste sent to landfills. Also, by using the compost in your garden, you can lessen the need to purchase expensive commercial soils in the spring.

Dunwoody needs every citizen’s help to protect our storm system and streams by keeping the leaves out. Preventing leaves from being put into the storm system and disposing of your leaves properly will both be critical steps in preserving the system and maintaining water quality for the future. If you would like to report leaf violations please call our Code Enforcement Department at 678.382.6807.

The City of Dunwoody's Deputy Director of Stormwater, David Elliott, PE, recently wrote an article which was published by the The Georgia Association of Water Professionals in the group's quarterly news journal, The Operator.

The article offers an overview of providing accurate and fair determinations of stream classifications, stream buffers, and stream outfalls -- especially within local jurisdictions such as Dunwoody.

To read the article (located on page 60 of the fall issue), please visit the magazine's official website.