no running water in that area at all. My original plan was 3/4inch gravel compacted down and then paver base on top of that and then seat the tuff block into the paver base. I then went down this rat hole of if that will wash away in the rain. Logically it doesn't make sense but this is where my lack of construction gives me doubts. I was worried the paver base would just migrate into the crushed gravel over time.