A NOAQ Boxwall is a mobile self-anchoring flood barrier. The NOAQ Boxwall creates a dam for water up to a height of 50 cm. The boxwall is so light that it can quickly be set up to protect buildings and other property against water damage, and also to keep roads open. A boxwall is designed for use on an even surface, such as a paved street, a concrete floor or a lawn. The boxwall is patented in a large number of countries. The BW52 model replaces an older version BW50, but the two models are fully compatible. A boxwall consists of sections (boxes) that are linked together by means of a simple manual operation. No tools are needed. For bends and corners there are certain corner boxes.