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The short answer: Setting up a rain barrel is a straightforward DIY project that takes about an hour. You’ll need to choose a level spot near a downspout, elevate the barrel for gravity flow, connect a diverter or cut the downspout, and ensure overflow is directed away from your foundation. Below, we walk through each step in detail, including common pitfalls and how to avoid them.
Your rain barrel needs a solid, level surface that can support its full weight when filled. A 50-gallon barrel weighs over 400 pounds when full, so don’t place it on soft soil or uneven pavers. Concrete blocks, a sturdy wooden pallet, or a purpose-built stand work well. Elevate the barrel at least 6 to 12 inches off the ground. This height increases water pressure when you attach a hose, making watering easier without a pump.
Place the barrel under a downspout that collects runoff from a large roof area. A typical 1,000-square-foot roof can produce over 600 gallons from one inch of rain, so position it where you expect the most water. Avoid areas with overhanging trees that drop leaves and debris, as they’ll clog the screen. Also, keep the barrel within reach of your garden or storage area so you don’t have to carry water far.
If you live in a cold climate, plan for winter. You’ll need to disconnect and drain the barrel before freezing temperatures hit. Ease of access for winterization is key, so don’t bury the barrel or make it difficult to move.
There are two main methods to connect your rain barrel to the downspout: a diverter or a direct downspout cut. Many top rain barrels, like those reviewed in our rain barrel buying guide, include a flexible downspout adapter or a diverter kit. Here’s how to handle both.
Using a diverter: A diverter attaches to the side of your existing downspout. You drill a hole, screw the diverter in place, and connect the barrel hose. The advantage is that you don’t have to cut the downspout, and when the barrel is full, water flows out the diverter and down the original downspout. It’s the easiest for beginners.
Direct cut method: If your barrel has an inlet at the top, you can cut the downspout to route water directly into the barrel. Measure the height of your barrel plus the stand, then mark the downspout at that height. Use a hacksaw or tin snips to cut, then attach a flexible elbow to direct water into the barrel’s inlet. Ensure the inlet is covered with a fine mesh screen (most barrels have one) to keep out mosquitoes and debris.
Whichever method you choose, check that the connection is tight and leak-free. Use thread tape on threaded connections and a hose clamp on flexible hoses.
An overflow is essential. When your barrel is full, excess water needs somewhere to go. Most barrels have a pre-drilled overflow outlet near the top. If not, you can drill one yourself. Attach a hose or PVC pipe to the overflow and direct it away from your foundation. Ideally, route it to a rain garden, a second barrel, or a drainage area. Never let it just spill next to the house, as that can cause basement leaks.
Also, consider a hose adapter at the bottom spigot. Most barrels come with a standard garden hose threading. If you want to use a soaker hose, attach it directly. For gravity-fed watering, you’ll need the barrel elevated; if you didn’t elevate it enough, you might get a weak stream. You can also add a short hose to the spigot and use a spray nozzle.
Mosquitoes breed in stagnant water, so your barrel must have a tight-fitting screen over the inlet. If your barrel doesn’t have one, purchase a fine mesh screen or a floating mosquito dunk. Also, check for any gaps around the downspout connection where leaves or bugs could enter. Use silicone caulk or weatherproof tape to seal small openings.
If your barrel has a lid that’s not sealed, consider adding a rubber gasket. Some barrels have a removable top for cleaning; make sure it fits snugly. For extra protection, you can place a piece of fine mesh under the lid.
Once everything is connected, do a test run. Wait for rain or simulate with a hose. Check for leaks at all connections. Ensure the overflow directs water away as intended. If you notice slow filling, your downspout may be too small or the inlet screen is clogged. Clean the screen after heavy storms.
Maintenance is simple: empty the barrel completely every few weeks to prevent algae growth, especially in warm weather. Use a brush or a mild bleach solution (1 part bleach to 10 parts water) to scrub the inside, then rinse thoroughly. In winter, drain the barrel, disconnect hoses, and store it upside down or indoors. If you can’t move it, remove the spigot and open the overflow to let water drain.
With a gravity-fed barrel, pressure depends on elevation. For every foot of height, you get about 0.43 PSI. So a barrel elevated 3 feet gives about 1.3 PSI. That’s enough to drip water from a soaker hose or water plants at ground level, but not enough to run a sprinkler or power sprayer. If you need more pressure, consider a small rain barrel pump.
Yes. Use a hose from the overflow of the first barrel to the inlet of a second barrel. For best flow, connect them at the bottom using a short hose and a Y-connector, so both fill simultaneously. This setup doubles your storage without much extra work.
Generally, yes, for watering soil and not directly on edible parts. Rainwater is free of chlorine and fluoride, which many plants prefer. However, if you have a roof with treated wood or copper gutters, avoid using that water on edible plants. Also, always use a screen to keep out bird droppings and other debris.
Remember, setup is only the first step. Regular maintenance keeps your barrel functional for years. For help choosing a barrel that fits your needs, check out our top rated rain barrels. Happy harvesting!
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