Abstract
Combined sewer overflow (CSO) control in ageing urban areas is a costly and on-going issue. In addition, urban municipalities must deal with other daunting issues such as economics, sustainability, etc. In this paper, we show how decision makers might capitalize on the concept of natural capital or ecosystem services benefits, as well as other economic benefits in sewershed-scale green storm-water infrastructure (GSI) designs aimed at reducing CSO volumes. This concept is demonstrated on a sewershed within the City of Philadelphia using triple bottom line (TBL) estimates of benefits and continuous hydrologic/hydraulic simulations using EPA’s Storm Water Management Model (SWMM) coupled with a simple genetic algorithm (SGA). Results are compared to existing conditions. Also explored are situations where property values are excluded from the analysis as a method of promoting economic equity in GSI placement.
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