This is the first weekend I’ve had the rain barrel set up on the southeast corner of the house (where the majority of the runoff from the main roof empties out to the driveway.) I set it up and we left on a weekend where Maryland and D.C. saw some of the worst flooding in five years. When we got back on Monday night, the barrel was full and the overflow was shooting out of the side where I hadn’t plugged one of the threaded valve openings.
Tuesday I returned to the barrel with a handful of 3/4 PVC fittings and pipe length, and rigged up an overflow valve that empties into the driveway. The next project is to install the second rain barrel underneath the first to catch the overflow, and then rig up an overflow drain on that second barrel. That’s going to be trickier, because the second barrel is cheaper and lacks a threaded outlet at the top like the first barrel does, so I’m going to have to get creative.
Plus, the gravity platform I put in is not sturdy enough (it needs cross bracing) and needs a stronger platform to carry the weight of a full barrel.