What is the minimum size of gravel that can be used to backfill a trench of a silt fence?

The minimum size of gravel that can be used to backfill a trench of a silt fence is determined by the requirement for effective drainage and structural integrity of the fence. Using gravel that is between 0.75 and 1.5 inches in size allows for adequate permeability, enabling water to flow through the gravel without causing pressure buildup behind the silt fence. This size range also prevents the gravel from being easily displaced or washed away due to water flow, which helps maintain the effectiveness of the silt fence in controlling sediment and protecting the area from erosion.

Gravel larger than 1.5 inches might not settle effectively in the trench and could create voids, while gravel smaller than 0.75 inches may lead to clogging and reduce drainage efficiency. Therefore, the specified size range strikes an optimal balance between drainage capabilities and stability.