This video is of a marine outfall / diffuser inspection Jan 2012, King County Wastewater Treatment Division (WTD). The inspection was done by the Environmental Lab in the Water and Land Resource Division, in cooperation with the WTD West Point Treatment Plant staff, using an underwater remote operating vehicle (ROV). The ROV is like a small submarine with sonar and a video camera. This allowed the inspection team to look at the Carkeek outfall and its diffusers, down over 60 meters underwater in the Puget Sound, from the safety and comfort of a boat above.

In the video you can see the ROV fly over and zoom in on the outfall (the main pipe) and diffusers (the elbow-like structures), and occasionally being swayed by the strong current. The white, swirly or squiggly forms covering the pipe surface are keel or coiled tube worms which attach themselves to stones and other hard objects and build a calcareous or chalky tube. The white and orange, “Dr.Seuss-like” organisms growing off the outfall and diffusers are sea anemone, specifically plumose anemone. You can also see the yellow tether of the ROV, which connects it to the boat, old crab pots and a little crab.

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