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CHATTANOOGA By Colline Ferrier MPA
TCAPWA 2018 Project of the Year
Anderson Avenue Project
Background improvements alongside public right-of- AFTER COMPLETION
way improvements.
The Anderson Avenue Green delineated on-street parking areas,
Infrastructure Demonstration Project was Project Details with the current asphalt pavement
developed by the City of Chattanooga’s approximately 30 feet wide. The design
Department of Public Works Water Traditional stormwater management calls for 22 feet of asphalt with the
Quality Program. The project serves as a practices of merely concentrating and remaining to be pervious concrete.
model for replication in other areas where piping runoff would undoubtedly result On-street parking is designed as pull-
green infrastructure practices can be in the conveyance of contaminated urban outs along the westerly side of the street
established and monitored to determine runoff which pollutes our waterways. with pavers as the surface. Tree boxes
changes in water quality and quantity. The main goal of this retrofit project are utilized at the intersection of South
This green infrastructure demonstration is to focus on the immediate capture, Holly Street and Vance Avenue. Along the
project was required by Chattanooga’s re-use and infiltration of runoff through alignment within the right-of-way, there
Consent Decree with the EPA. innovative approaches that improve are landscape areas between the roadway/
water quality and also reduce the volume parking and sidewalk. These areas will
Located in the historic Highland and velocity flowing to waterways. The accommodate infiltration beds, flow-
Park neighborhood of Chattanooga, project decreases the amount of existing through planter boxes and proprietary
the project is within a subwatershed impervious surface area, slows erosive water quality devices. The green
of Dobbs Branch, an impaired stream stormwater flows and increases beneficial infrastructure proposed for this portion
listed on the Clean Water Act 303(d) infiltration. is anticipated to remove 80 percent of the
list. The project encompassed a portion total suspended solids (TSS) from runoff
of the subwatershed along two blocks South Holly Street Retrofit generated by a design storm up to and
of Anderson Avenue, and a one-block including 2.1 inches of rainfall over a 72-
section of South Holly Street. These The previously existing layout of South hour period.
areas are unique as the project addresses Holly Street was mostly unchanged.
stormwater runoff at its source with However, to accommodate green Anderson Avenue Retrofit
the integration of private property infrastructure practices, the roadway
width was lessened to accommodate Anderson Avenue’s layout has changed
dramatically, from the existing purely
18 TPW January/February 2019
