Constructed Levee            

High embankment that runs parallel to a river. They can be made of rock or soil, and occasionally have concrete as well. They are built to contain the water in the streambed, and prevent flooding. Levees tend to have broad bases, and taper to a narrower top. The photograph shows a grass covered artificial levee along the Mississippi River. In large storm events, levees may not be able to withstand floodwaters and sometimes levees may be intentionally breached to prevent flooding further downstream as shown in the video.