If you're tired of seeing your water supply run dry after just one afternoon of watering the tomatoes, learning how to make your rain barrel connect together is probably the best weekend project you could tackle. It's one of those things that sounds a bit intimidating if you aren't a plumber, but honestly, it's mostly just drilling a couple of holes and making sure things are level. Once you've got a "daisy chain" of barrels set up, you go from having a measly 50 gallons of water to a massive reservoir that can actually sustain a garden through a dry spell.
I remember the first time I set up a single barrel. I was so proud of it until the first big summer storm hit. Within twenty minutes, the barrel was full, and the rest of that glorious, free rainwater was just dumping out of the overflow and soaking the foundation of my house. It felt like such a waste. That's when I realized that unless you live somewhere where it rains every single day, one barrel just isn't going to cut it. You need a system.
Why You Should Link Your Barrels
The math is actually pretty wild when you look at it. A standard roof can shed hundreds of gallons of water during a decent rainstorm. If you only have one tank, you're catching maybe 5% of what's available. By having your rain barrel connect together with others, you're basically building a custom cistern.
The best part is that it's scalable. You can start with two, and if you find you still have too much runoff, you can just keep adding more down the line. It gives you a huge safety net for those weeks in July or August when the sky turns into a brass bowl and your plants start looking a little crispy. Plus, it saves a ton of money on the water bill, which is always a win in my book.
Choosing Your Connection Method
There are really two main ways to go about this, and which one you pick depends on how you want the water to move. You've got the "top-fill" method and the "bottom-fill" method. Both work, but they behave a little differently.
The Bottom-Link Approach
This is my personal favorite. In this setup, you connect the barrels near the bottom. Because of how physics works (gravity and all that), the water level will stay the same in all the barrels simultaneously. As the first barrel fills up from the downspout, the water gets pushed into the second barrel, then the third, and so on.
The big advantage here is that you only need one spigot at the very end of the line to access all the water. It's super convenient. The downside? If one barrel gets a leak at the bottom, the whole system might drain out. But if you use good fittings, that's usually not a huge worry.
The Top-Link Approach
This is more of an "overflow" style. You connect the barrels near the top. The first barrel fills up completely, and once it reaches the connector pipe, the excess spills over into the second barrel. It's a bit easier to set up if you're worried about leaks because the water pressure at the top is much lower.
The annoying part about this method is that to get the water out, you either need a spigot on every single barrel or you have to wait until they're all full. It's a bit less efficient for using the water, but it's a very safe way to start if you're nervous about cutting holes in the bottom of your plastic tanks.
Tools and Materials You'll Actually Need
You don't need a specialized kit for this, though they do sell them. You can usually find everything at a local hardware store. Here's the basic list:
- Bulkhead fittings: These are the most important part. They're the little plastic or brass threaded pieces that create a waterproof seal through the barrel wall.
- A drill and a hole saw bit: Make sure the bit matches the size of your bulkhead fitting.
- Short lengths of hose: You can use actual garden hose or flexible PVC tubing.
- Plumber's tape (Teflon tape): Don't skip this. It's the difference between a dry setup and a constant, annoying drip.
- Cinder blocks or a sturdy stand: Water is heavy—like, really heavy.
Setting Up the Foundation
Before you even think about how your rain barrel connect together, you have to think about where they're sitting. A full 50-gallon barrel weighs over 400 pounds. If you have four of them linked together, you're looking at nearly a ton of weight sitting on your soil.
If the ground isn't perfectly level, those barrels are going to start leaning, and eventually, the pressure will crack your connectors or, worse, the barrels themselves. I usually recommend clearing the area, tamping down the dirt, and laying down some gravel or heavy pavers. Most people use cinder blocks to raise the barrels up. This isn't just for stability; it also uses gravity to give you better water pressure when you're trying to use a hose later.
The Step-By-Step Process
Once your barrels are sitting where you want them, it's time to do the "surgery."
- Mark your spots: If you're doing a bottom connection, mark a spot about 2-3 inches from the bottom of each barrel. You don't want it right on the floor because sediment (dirt and roof gunk) tends to settle there, and you don't want that clogging up your pipes.
- Drill the holes: Use your hole saw. Go slow. Plastic can sometimes crack if you ram the drill through too fast.
- Install the bulkheads: This is where it gets fun. You'll probably have to reach inside the barrel to tighten the nut on the back of the fitting. If you have long arms, you're in luck. If not, you might need a buddy to help or a long-handled wrench.
- Seal it up: Use that plumber's tape on the threads. Tighten it well, but don't go so crazy that you strip the plastic threads.
- Connect the hose: Attach your short piece of hose between the two bulkheads. Make sure there's a little bit of slack so that if the barrels shift slightly, the hose won't pull out.
Managing the Overflow
Even with three or four barrels, a massive thunderstorm can still overwhelm the system. You must have an overflow outlet on the very last barrel in the chain. Run a hose from that overflow away from your house. It sounds redundant, but if you don't do this, the water will just back up into your downspout or spill out the top of the first barrel, which defeats the whole purpose of having a neat, organized system.
Keeping Things Clean
Since you've gone through the trouble to make your rain barrel connect together, you want to make sure the system stays functional. Roofs are dirty places. You've got leaves, bird droppings, and those little asphalt granules from the shingles.
I highly recommend putting a fine mesh screen over the entry point of the first barrel. This stops the "big stuff" from getting in. If debris gets into your linking hoses, it can be a real pain to clear out without dismantling the whole thing. Also, make sure the barrels are opaque (not see-through). If sunlight can get inside, you'll end up with an algae farm, and that green sludge will clog your spigots faster than you can say "garden hose."
Wrapping Things Up
It might take an afternoon of sweating and a little bit of trial and error, but seeing that system full for the first time is incredibly satisfying. There's a certain peace of mind that comes with knowing you've got a massive backup of water ready for your plants.
When you make your rain barrel connect together, you're not just saving water; you're building a more resilient home. It's a simple DIY project that pays for itself in a single season. Just remember to check your seals once a year and keep those screens clean, and your garden will thank you all summer long. Now, go grab your drill and get started!