[en] Concrete containment walls and internal concrete barrier walls are often required to withstand the effects of missile impact. Potential missiles include external tornado generated missiles (steel rods, steel pipes, wooden poles, and automobiles), aircraft crash, and internal accident generated missiles (turbine blade, and steel pipe missiles resulting from pipe break). Impacting missiles can be classified as either 'hard' or 'soft' depending upon whether the missile deformability is small or large relative to the target deformability. This paper only deals with the effects of 'hard' missile impact. Missile velocities between 100 and 1500 ft/sec are emphasized. 'Hard' missile impact results in both local wall damage and in overall dynamic response of the target wall. Local damage consists of spalling of concrete from the front (impacted) face and scabbing of concrete from the rear face of the target together with missile penetration into the target. If damage is sufficient the missile may perforate or pass through the target. This paper reviews the various empirical procedures commonly used for determining penetration depth, perforation thickness and scabbing thickness for concrete targets subjected to 'hard' missile impact. Results obtained from these procedures are compared with test data results for low velocity impacts (200-1500 ft/sec). Design recommendations to prevent detrimental local wall damage are presented. (Auth.)