Which factor is NOT included in the USLE?

The Universal Soil Loss Equation (USLE) is an established tool used to estimate soil erosion caused by water. It is composed of several key factors that contribute to the amount of soil loss that can be expected in a given area.

Soil erodibility refers to the inherent vulnerability of a particular soil type to erosion, taking into account its characteristics such as texture, structure, and organic matter content. Slope length is crucial in determining the potential for erosion, as longer slopes can lead to increased runoff speed, resulting in more significant soil loss. Cover management practices involve the use of vegetation and land management techniques to protect the soil surface and reduce erosion.

The age of a construction project, while relevant to factors such as site stability and sediment control, is not a parameter that is directly included in the calculations of the USLE. Therefore, it does not fit into the equation's framework for estimating soil erosion, making it the correct choice for the factor that is not included in the USLE.