Beta
  • With such a wealth of information here at SWAN, we want to make it easier for you to find the knowledge you seek as quickly as possible.

  • Lighthouse uses some of the most advanced AI language models to understand your questions and sifts through SWAN's entire knowledge base to find an answer. We have carefully trained it to present relevant information in a consolidated way.

  • As you navigate an ocean of information, let Lighthouse be your beacon.

  • Disclaimer: We cannot always guarantee complete or accurate responses, given that AI-powered dialogue is still an emerging technology. Lighthouse will always accompany answers with the most relevant references, which we encourage you to check out. We highly value your feedback to ensure that Lighthouse meets the highest standards of quality and reliability. If you notice something off, please contact us at: info@swan-forum.com.

  • Ready to join us?

    SWAN Members enjoy full access to Lighthouse (unlimited searches and gated content) along with global membership benefits.

Looking for classic search?

Case Study

Balancing Green & Grey Infrastructure Investment in the City of Atlanta

The City engaged Optimatics and Stantec Consulting to developed optimised Long-Term Control Plans (LTCPs) for three of their sewersheds with an emphasis on sustainable stormwater management practices.

AUTHOR

Related Topics

Stormwater Management

Green vs. Grey Infrastructure

The City of Atlanta Department of Watershed Management (DWM) is one of the largest utilities in the country, servicing 1.2 million customers daily. DWM places strong emphasis on sustainable stormwater management practices and utilises green infrastructure throughout its networks.

THE CHALLENGE

Prior to the optimisation study, DWM identified a range of potential projects in the North Avenue, Clear Creek, and Intrenchment Creek basins to improve hydraulic performance and water quality. The projects involved grey (pipes, tanks etc.) and green infrastructure projects (rain gardens, swales etc.). Having identified these projects, DWM needed to determine which were the most effective to meet performance goals.

THE SOLUTION

Using the OptimizerTM platform, the project team was able to develop a multi-objective optimisation framework where three separate objectives could be utilised simultaneously:

  1. Project Costs
  2. Hydraulic Performance (CSOs, flooding, freeboard)
  3. Triple Bottom Line (TBL) Co-Benefits (social, environmental etc.)

The incorporation of the TBL objective allowed for the green infrastructure projects to be more fairly weighted in the optimisation and is more beneficial than grey infrastructure.

The Optimizer software allowed the Department of Watershed Management to identify the best solutions that aligned with the City of Atlanta ‘One Water’ Vision.

-City of Atlanta Commissioner, Mikita Browning

RESULTS

The project was able to produce hybrid LTCP solutions that cost $65M less than previously proposed grey-only solutions while achieving the same level of hydraulic performance. The proposed solution also scored well for the monetised TBL objective.

The success of the optimisation effort can be contributed to the following:

  • Produced LTCP solutions that saved significant capital costs for DWM and provided benefits to the environment and community through the incorporation of green infrastructure projects.
  • Established a repeatable framework that can be used by the City of Atlanta or other municipalities to incorporate TBL benefits into collection system optimisations.
Featured SWAN Members: