This document discusses the failure of earthen dams. It identifies three main categories of dam failure: hydraulic failures, seepage failures, and structural failures. Hydraulic failures can occur due to overtopping, erosion of the upstream face, cracking due to frost action, erosion of the downstream slope, and toe erosion. Seepage failures involve piping through the dam or foundation and sloughing. Structural failures include those caused by excess pore water pressure, upstream or downstream slope failures, foundation slides, and failures due to earthquakes. Proper design, construction, maintenance, and operating procedures can help prevent these failure modes.