Wing dam in a man-made river bed. A wing dam or wing dike is a manmade barrier that, unlike a conventional dam, only extends partway into a river. These structures force water into a fast-moving center channel which reduces the rate of sediment accumulation while slowing water flow near the riverbanks.
Each foot is made up of 28 bones, 30 joints and more than 100 muscles, tendons and ligaments, all of which work together to provide support, balance and mobility. Here's a look at the main structures of the feet. Bones. Nearly one-fourth of the body's bones are in our feet.The bones of the feet are:1  Talus â the bone on top of the foot that forms a joint with the two bones of the lower leg, the tibia and fibula. 2  Calcaneus â the largest bone of the foot, which lies beneath the talus to form the heel bone.ones. Nearly one-fourth of the body's bones are in our feet. The bones of the feet are: 1  Talus â the bone on top of the foot that forms a joint with the two bones of the lower leg, the tibia and fibula. 2  Calcaneus â the largest bone of the foot, which lies beneath the talus to form the heel bone.
The knee is a pivot-like hinge joint in the leg that connects the bones in the upper and lower leg. It is the largest joint in the human body. The knee is where the femur in the upper leg meets with the tibia and fibula bones in the lower leg. Another bone, the patella or kneecap, is at the center of the knee.The knee joint is composed of numerous tendons, ligaments, and protective elements, such as cartilage and bursa.any muscles that power foot movements begin as high up as the back of the knee and extend down to the foot. Possibly the most important structure in the lower leg is the Achilles tendon. It connects three musclesâthe plantaris, calf, and soleusâto the heel bone.