What size stone do you use for a dry well?
What size stone do you use for a dry well? What size gravel should be used for the dry well? #57 stone is the size to use. How do you calculate dry well size? Divide the runoff volume by the 40% void space to find the volume of the dry well. If using a material that has a different void space, substitute that value for the 0.40 in the equation below. The total volume of the dry well will be used to determine the dimensions of the dry well box. How deep should a dry well be? three feet deep...