The Marsh Creek Rain Garden Park is an innovative program designed to improve water quality by treating and filtering stormwater runoff before it flows into Marsh Creek, the tributary leading into the Chattahoochee River. The project is anticipated to reduce flooding and stream bank erosion in the neighborhoods surrounding the immediate headwater area by reducing and controlling stormwater flow. The official ribbon cutting to open the park took place on Tuesday, December 6, 2016.
Formerly known as Marsh Creek Headwaters Best Management Practice (BMP), Marsh Creek Rain Garden is located downstream from the City Springs development on Johnson Ferry Road.
Marsh Creek is listed by the Environmental Protection Department as an impaired water body for not meeting the state’s water quality standards primarily due to urban storm water runoff. Working with the Georgia Environmental Protection Department (EPD), this City project should not only improve water quality for Marsh Creek, but could also become a model for regional detention facilities.
Storm water, dirt, grease, debris and pollutants that wash away during rainstorms, is filtered through a natural water treatment process. Storm water runoff will flow through a bio-retention area that cleans and treats the water with aquatic native vegetation and specially designed soils. The water is then channeled into a wet pond that removes pollutants and sedimentation. A fountain in the wet pond will circulate and oxygenate the water, increasing the number of organisms that consume and break down contaminants. In addition to the cleaning process, the project will also reduce flooding and stream bank erosion.
An added feature is esthetics. Project amenities will include green space, walking trails, and extensive landscaping, as well as educational signage to explain the storm water treatment process.
The City and the EPD, through the Nonpoint Source 319h Grant program, fund this project jointly. Water quality monitoring for this project pre- and post- construction will allow EPD to measure its effectiveness with hopes of replicating the successes in future detention programs.
Project background materials: