This wind dam is made of fabric, and is supported by very tall guyed towers. Its cross-section is shaped like an American Indian Tipi:
The fabric on either side of the tower may be rolled up to the top of the tower or rolled down to ground level. The fabric on both sides of all towers can be rolled up or down to minimize the drag profile during storm winds. The fabric on the upwind sides of the towers that are on the upwind side of the dam is rolled up to concentrate the flow. The fabric on the downwind sides of the towers that are on the downwind side of the dam is rolled up to further concentrate the flow. The operation of the machine is very similar to the operation of the Circular Wind Dam. Two wind dams may be constructed as described here so that they form concentric rings. In this way, the concentric rings variation of the Circular Wind Dam may be mimicked.