Let’s install a gravel driveway First, we scrape out the loose powdery soil and roots. Once we have the base material spread and compacted, then comes the top layer, in this case #67 crushed stone. We spread and back drag the gravel for slope and drainage. in this case there was enough natural swale that a culvert was not required. The benefit of Gravel is of course cost and the fact that gravel can be graded and dressed many times over the lifetime of the driveway.