The Economic Benefits of Green Infrastructure: A Case Study of Lancaster, PA -

Lancaster, like hundreds of other cities across the county, has both a combined sewer system (CSS) and a municipal separate storm sewer system (MS4). While the CSS collects both sewage and stormwater and conveys flows to a wastewater treatment plant (WWTP), the MS4 collects only stormwater runoff and discharges flows directly to receiving streams. The benefits analysis summarized in this report evaluates how installing green infrastructure in the CSS area could reduce gray infrastructure capital investments and associated wastewater pumping and treatment costs; as well as how installing green infrastructure in both the CSS and MS4 areas could produce a range of environmental benefits across the city

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