How thick should the layer of no.5 stone be on the upstream side of the outlet?

The correct thickness for a layer of no. 5 stone on the upstream side of the outlet is 6 inches. This specific thickness is recommended to provide adequate filtration and stability. A layer of this depth helps to facilitate proper water flow while capturing sediment that might otherwise be carried away.

The no. 5 stone, typically consisting of a specific size range, ensures that voids are present, allowing water to permeate through while retaining larger particles. By establishing a depth of 6 inches, you strike a balance between effective sediment control and maintaining sufficient structural integrity at the outlet, mitigating the risk of erosion and ensuring that the stone layer functions as intended in managing water runoff.

Understanding the importance of this thickness aids in implementing best practices for erosion prevention and sediment control measures. Choosing a thicker or thinner layer could compromise the effectiveness of the system in preventing sediment discharge and safeguarding water quality.