Hello, I am going to start a project soon in my backyard using the NDS Flo-Well Catch Basin. Its a 50 gallon basin which I am going to use to catch my downspout water from the back roof of my house. I have one downspout that will go into the catch basin 15 feet from back of house. The hole I am going to dig will be 4'x4'x4'. Lined with 2B limestone and will use landscaping fabric around the hole and catch basin itself. I will be using all 4" PVC piping. Has anyone here ever done this? If so, could you give me some tips or advice on how to do this correctly? I have all the things I need, except (2) 10ft PVC pipes. How much 2B limestone will I need? The hole itself is 64 cubic feet, but minus the basin which is roughly 16 cubic feet. So, 48 cubic feet is what I need about. That should be about 2 tons, sound about right? I have not started digging yet, but what if the dirt is all clay? Then, what should I do? Dig another spot? Thanks and hope you can help.