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For more information incorporating all programmed projects. Impervious area calculations were performed for each project and a total net impervious area was calculated for the overall plant. The intent of this exercise was to capture impervious areas not shown on the plant’s site topographic survey.

Collecting data and calculating the impervious footprint for projects in different stages of design and construction were challenging tasks because the projects were managed under multiple programs and by different consultant teams. Estimating a net impervious footprint was an important step to inform the ICPR model and run scenarios for the 2030 planning horizon. Coordination and communication among the various stakeholders were key steps in bringing the overall site plan and phasing plan together.

The project site had many unique site constraints that posed additional challenges. Due to the plant’s proximity to Biscayne Bay, containing stormwater onsite was critical and percolation rates for the site varied in range based on the sub-basin. Increases in groundwater elevations due to SLR were also a concern because of the plant’s designation as a flood hazard area based on Federal Emergency Management Agency (FEMA) flood maps. Solutions that incorporated redundancy in handling both water quality and quantity were a key component in addressing site constraints and allowed adaptability for longterm stormwater control.

Conclusion

The SWMP update for the CDWWTP provides a robust solution to protecting critical infrastructure in vulnerable communities susceptible to SLR and is an example of how stormwater master planning is an integral part of planning and adaptation strategies for wastewater utilities. Knowledge of the southeast Florida unified sea level rise projections, NOAA Atlas 14, and South Florida Water Management District (SFWMD) depth-duration-frequency (DDF) report is also important for future planning when considering SLR and flooding.

The CDWWTP has many unique site constraints and multiple ongoing construction projects contributing to an increased impervious footprint. Coordination among all stakeholders was a key component to developing holistic stormwater design criteria that meet both current and future stormwater needs for the wastewater treatment plant and incorporates SLR.

Acknowledgments

We would like to express our sincerest gratitude to the Miami-Dade Water and Sewer Department for the opportunity to work on this project. This project was a collaborative effort with the OOL program.

References

• “Central District Wastewater Treatment Plant Stormwater Master Plan.” MWH (now Stantec). 2017 (pdf).

• “Design Guide for Hardening Wastewater Treatment Facilities Against Flooding from Surge, Sea Level Rise, and Extreme Rainfall.” Jacobs Engineering. 2019 (pdf).

• South Florida Water Management District Determination of Future IntensityDurationFrequency Curves for Level of Service Planning Projects. SFWMD. 2016 (pdf). S

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2023-2024

FWEA Board of Directors