Retrofitting impervious surfaces to reduce stormwater runoff impacts in municipalities with combined sewer systems
Hamilton, Milton Hugh
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This thesis examines retrofitting impervious surfaces to pervious surfaces to address a large-scale combined sewer overflow problem in Nashville, Tennessee. The question being researched is: What management and design strategies should municipalities use to retrofit traditional impervious surfaces to pervious pavements in an effort to reduce stormwater impacts on combined sewer systems? Pervious pavements are widely promoted in new developments; however, the potential to retrofit existing impervious surfaces has received limited attention. With the Environmental Protection Agency assessing millions of dollars in penalties to municipalities for pollution from combined sewer overflows, retrofitting pavements should be a valid consideration to address this pollution concern. Evaluation and diagnostic strategies, and projective design will be used to evaluate the practical considerations, implementation cost, and performance of retrofitting impervious pavements.