Experts warn of 'dead zone' in Chesapeake Bay from pollution

When the Conowingo Dam opened to fanfare nearly a century ago, the massive wall of concrete and steel began its job of harnessing water power in northern Maryland. It also quietly provided a side benefit: trapping sediment and silt before it could flow miles downstream and pollute the Chesapeake Bay, the nation's largest estuary.

source https://www.lifetechnology.com/blogs/life-technology-news-blog/experts-warn-of-dead-zone-in-chesapeake-bay-from-pollution