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Toxic Algae in Lake Needwood
Lake Needwood is a 75 acre reservoir located in Derwood, Maryland. The lake was created to provide flood control to Rock Creek and to protect the creeks water quality by acting as a retention basin to trap sediment from stormwater runoff.

This past fall Lake Needwood posted warning signs to “Avoid contact with Lake Water” after testing positive for toxic algae. Harmful algal blooms are often triggered by excessive levels of nutrients such as nitrogen and phosphorus. The excess nutrients come from many sources such as aquatic plants and fertilizers and stimulate the growth of algae.

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Public Awareness or Fewer People, What Made the Difference in Decline of Marine Debris - Labor Day weekend on the Sacramento River would typically yield large amounts of floating debris. Beer boxes, foam coolers, plastic bags, alcohol containers, tubes and flip-flops left behind by visitors would normally stuff 40-cubic-yard trash containers, but this year a 30-yard container was only a third full.


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