At what slope does a conical surface extend upward from the perimeter of the horizontal surface?

The correct slope for a conical surface that extends upward from the perimeter of a horizontal surface is typically indicated as 20:1. This means that for every 20 units of horizontal distance, the slope rises 1 unit vertically. This particular slope is often used in various engineering and design standards, especially in civil engineering and aviation contexts, to ensure stability and proper drainage while maintaining a safe and manageable incline.

In the context of a conical surface, commonly used in structural designs, a 20:1 slope helps to reduce the risk of erosion and facilitates maintenance by providing a gentle incline. This is particularly important in situations involving earthwork or where a gradual transition is necessary, such as at the edges of runways, taxiways, or other surface areas.

Other slopes, like 3:1 or 7:1, are much steeper and would not generally apply to conical surfaces in the way it is structured in this scenario. The 10:1 slope, while less steep than 3:1 or 7:1, still does not meet the commonly accepted standard for a conical surface, which is typically set at 20:1 for optimal performance. Thus, the choice of 20:1 reflects best