Entries by imported

Three Reasons Eelgrass is Declining—What’s Being Done?

In an earlier post we showed how important eelgrass is to fish, and noted that eelgrass is declining worldwide. West coast eelgrass is affected by a combination of coastal development and nutrient pollution, direct displacement (such as dredging activities), and climate change. Here’s why: Eelgrass needs light. Urbanization and construction activities in coastal areas remove vegetated buffers, allowing […]

Eelgrass—Nowhere to Hide

A marine ecologist in Hart Crowser’s Anchorage, Alaska office, overheard a recent complaint, “When I go fishing I can’t stand all this ‘eelweed’ getting in my prop and fouling my lines.” “Then why do you fish where there is eelgrass?” asked the marine ecologist. “Because that is where fishing is best.” That was the crucial […]

5 Things Lurking Underwater

We previously posted about things you didn’t know were under your feet. Now we’re posting about things you may not know are underwater. Hart Crowser staff have been involved with projects with the following submerged items: Logs and wood waste. This isn’t that surprising, given Seattle’s logging industry history. See this KOMO news broadcast for […]

Emerging Contaminants – Perfluorinated Compounds

You could say that perfluorinated compounds (PFCs) are the Superheros of chemicals. They resist heat and other chemicals, have dielectric properties, make things slippery, and repel grease and water. That’s why they’re used in fire-fighting foams, semiconductor manufacturing, medical implant devices, pharmaceutical tubing, non-stick cookware, and coatings for carpet, clothing, and food packaging. In fact, […]

What Do Tree Trunks and Fish Ears Have in Common?

Most of us know about tree rings—a tree forms a new one every year in its trunk. When counted, they tell us the tree’s age. But trees are not the only living things to produce annual rings. All fish produce small calcium carbonate structures just below their brains called “otoliths.” Fish add calcium carbonate and […]

Bathtubs and Floating Buildings

You wouldn’t think that a building built on solid ground would be in danger of floating upwards. In fact, building where the water table is close to the surface can make this a concern. Dewatering the soil can keep floating buildings from being a problem, but some areas can’t be dewatered. Here’s one example. Back […]

Seattle Children’s Hospital Rain Gardens

In an earlier post (Infiltration and Laboratory Testing Support Green Design), we described how rain gardens and bio-filtration swales are important to sustainability. The Seattle Children’s Hospital main campus expanded through the Building Hope program to meet the growing need in our region. Please enjoy these photos of the rain gardens when they were newly […]

Wetland Banking 101

When the EPA and Army Corps of Engineers released their final rule on Compensatory Mitigation for Losses of Aquatic Resources in 2008 (2008 Rules), compensatory mitigation became as easy as going to the bank. A mitigation bank, that is. The 2008 Rules set out a hierarchy for mitigation that gives preference to larger-scale wetland restoration […]