Two rounds of heavy rainfall Monday washed nearly 600,000 gallons of sewage-contaminated stormwater into Baltimore's harbor, city officials said.

A mix of human waste and storm runoff routinely overflows from Baltimore’s sewage system during heavy rainfall. Water enters sewers through breaks and cracks in pipes and reaches streams and the harbor through outflows designed a century ago to relieve the system when it’s overloaded.

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As another surge of stormwater and pollution flows through Conowingo Dam, scientists worry about impact on oysters, grasses

As another surge of stormwater and pollution flows down the Susquehanna River, requiring Conowingo Dam floodgates to open for the second time in weeks, Chesapeake Bay scientists are concerned about the potential impact on oysters and still watching closely for other impacts.

The largest single overflow Monday, about 208,000 gallons, washed into the Jones Falls near the Baltimore Streetcar Museum during an early morning rainstorm.

More overflows occurred when a round of storms passed through Monday night.

The city is required to close the outflows and stop most sewage overflows by 2021 under a consent decree with the Environmental Protection Agency and Maryland Department of the Environment.

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