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In 2020, engineers pumped 225,000 cubic yards of dredged sediment into the Columbia River; it became four new islands now being studied as salmon habitat

A routine dredging project on the Lower Columbia River has become a major long-term experiment to see whether dredged sediment can be used to restore lost wildlife habitat.

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https://timesofindia.indiatimes.com/world/europe/the-netherlands-used-37-million-tonnes-of-lake-sediment-to-build-new-islands-and-the-artificial-wetlands-now-attract-thousands-of-birds/articleshow/133143892.cms

Marker Wadden: The Netherlands used 37 million tonnes of lake sediment to build new islands, and the artificial wetlands now attract thousands of birds | World News - The Times of India

https://timesofindia.indiatimes.com/world/europe/the-netherlands-used-37-million-tonnes-of-lake-sediment-to-build-new-islands-and-the-artificial-wetlands-now-attract-thousands-of-birds/articleshow/133143892.cms