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Pleasant Run/Pogues Run Low Impact Development Analyses for Combined Sewer Overflow Abatement

Indianapolis, IN

The City of Indianapolis, moving to address wet-weather combined sewer overflow (CSO) issues, assessed above-ground alternatives utilizing Low Impact Development (LID) Green Infrastructure techniques for stormwater capture and treatment prior to discharge. The City retained EMH&T within their current Pleasant Run Deep Tunnel Facility Plan project to perform a comprehensive evaluation of the entire 6,700 acres of combined sewer service area watershed (40% impervious surface), and all 55 CSO overflow sub-watersheds for LID opportunities. 

Similar to the Pleasant Run project, the City retained EMH&T within their current Pogues Run Deep Tunnel Facility Plan project to perform a comprehensive evaluation of LID potential within the CSO watershed. Due to the extremely high percentage of impermeable surface within the ultra-urban study area, the City focused on integration of LID techniques within the downtown revitalization and economic development programs currently being implemented by the City. The Pogues Run CSO watershed is centrally-located within downtown Indianapolis and comprised of 16 sub-catchments. The study included a focus on developing cost-effective options for inflow re-direction including, the investigation for public-private partnerships for implementing LID practices. 

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