This article discusses how with recent rains in California, which has been in a drought for years, has had rivers carrying lots of sediment. This sediment helps build up the marshes, this is important for the local wildlife that use the marsh as a home, or stopping ground for migratory birds.

 

http://www.sfgate.com/news/article/San-Francisco-Bay-turns-brown-after-nonstop-storms-10932444.php

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