Photo courtesy of USACE Instrument packages at 28 points along the 7.5-mile levee include spider magnetometers, which slide down a tube as the soil below the levee compresses. Clusters also include two inclinometers that bow out of plumb in response to horizontal soil movement and settlement plates buried in the new lifts to measure placement and consolidation in the new work zone. A benchmark, anchored in a stable sand layer, completes the package. + Image Infographic courtesy of USACE Inclinometers bow out of plumb in response to horizontal soil movement and settlement plates buried in the new lifts. Related Links:
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.