24% Aerodynamic Porosity Fabric Information
F1 – Choose the more porous fabrics such as 20% and 30% aerodynamic porosity. This gives a modest reduction in wind speed over a greater distance. The loads on the structure are also minimized which reduces the cost. This effect is quite pronounced as typically 70% of the total cost are the poles, and the cost of the poles is tied to how strong they need to be.
The 30% aerodynamic porosity fabric is also useful in internal situations where there are several lines of shelter as the shelter effect and the turbulence is aggregated.
F4 – The bottom part of a downwind wind fence can be more solid. This makes sense as 90% of eroded dust never gets far above the ground apart from when it is being blown up the face of a solid obstruction. A low block wall is often used at the very bottom as it gives loaders something to run their blades against.
Above that fabric of 24% aerodynamic porosity is usually recommended. It gives excellent dust control without flapping and banging too much. More solid fabrics are available but they can have durability issues unless they are very narrow (1.2 m wide or less).
F5 – The ideal cladding fabric for most situations is the 24% porosity. It is porous enough to allow the enclosure to breathe, but still trap nearly all dust inside it.
- Used down low on fences
- Good for close to stock pile