- Located on the coast of Orcas Island, this 57 acre forested preserve protects natural examples of dry-site forest communities dominated by Douglas-fir, Pacific madrone, salal and ocean spray, representing the “rain shadow” vegetation that occurs in the San Juan Islands. Bald eagles feed and nest on the preserve and seals haul out on the rocky shoreline. A small state-owned recreation site on the point is used for marine mammal study, kayak and small boat camping, as well as outdoor education through nearby, privately owned Camp Orkila.
- How French Drains Work (practical.engineering)
In February of 2017, one of the largest spillways in the world, the one at Oroville Dam in northern California, was severely damaged during releases from heavy rain. You might remember this. I made a video about it, and then another one about the impressive feat of rebuilding the structure. In the forensic report following the incident, one of the contributing causes identified in the failure was the drainage system below the spillway. Rather than being installed below the concrete, each drain protruded into it, reducing the thickness of the concrete and making it more prone to cracking.