PA cities have a sewer-system problem. Green infrastructure can help — but comes with its own risks

In many cities, rainwater is drained through "grey infrastructure" things like pipes, streets, etc. In some cities, this system is combined with the sewage system. Rainwater drains into the sewage system, is then cleaned, then emptied into the river. However, with strong storms some sewage systems overflow. A problem that will worsen with climate change. In Harrisburg, Pennsylvania, rain gardens are one solution to overflowing sewage systems. Cities like Harrisburg are turning to green infrastructure, things like rain gardens, roofs with gardens, and parks, to ease the burden on gray infrastructure.

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