I ordered 2 27,000L tanks. I didn’t have my sand pad done (sand not delivered in time), so got them dropped in the paddock. I then used ropes, chains and decking boards and a couple of ceiling battens to use as skids, and slid the tanks away from the shed. Sand finally delivered, leveled it out by hand, then dragged the tanks into place, again using ropes, chains and skids… and the van.
I created a first flush diversion by adding a T section and drop pipe in the PVC of each downpipe (last photo). An end cap screws off for cleaning, and I also added a small hole to the bottom of the cap, so small showers won’t make it to the tanks, and any heavier dirt settles in the bottom of the drop pipes, which get cleaned periodically.