Stormwater biofiltration increases coho salmon hatchling survival
PUYALLUP, Wash. – A relatively simple, inexpensive method of filtering urban stormwater runoff dramatically boosted survival of newly hatched coho salmon in an experimental study. That’s the good news for the threatened species from the Washington State University-led research. The bad news: unfiltered stormwater killed almost all of them.
The findings, published in the journal Science of the Total Environment, are consistent with previous research on adult and juvenile coho that found exposure to untreated roadway runoff that typically winds up ...














