How to Build a DIY Rain Barrel

The fastest way to fill up your rain barrel is by placing it under a downspout. Tyler Dell, program manager and research associate at the Colorado Stormwater Center, recommends choosing a downspout location with an adequate amount of roof drainage, greater than 350 square feet of roof. That way every time it rains, you’ll be able to maximize your yield.

Once you’ve determined the best downspout location, you can either cut it to your desired height or install a diverter to funnel part of the stream to your barrel. You can find rain barrel diverters at most home improvement stores, as well as local water conservation organizations, such as Colorado Rain Catchers.

If you opt to cut your downspout instead, a utility knife should be enough. But if the material is too thick, a Dremel tool is recommended. Then, reattach the curved end so it rests just above the top of the trash can.

Make sure the trash can is clean before this next step. You don’t want any dirt or plastic bits floating around in the water. Once cleaned, roll the window screen over the top of the barrel. Use your staple gun to attach the screen around the lip of the barrel. Cut off any remaining material with scissors.

Now, you’ve essentially made a rain barrel. But to avoid leaves piling up on it, you should take the extra step and cut a hole in the lid. Use your utility knife to cut out a hole large enough that your downspout can drain into it. If your lid is indented, you should have no problem cutting a rectangular hole out of the inside edges.

Place the barrel underneath your downspout, on top of the cinder blocks. Make sure the downspout is lined up over the hole in the lid. Next, attach your garden hose to the bottom faucet. The next time it rains, you’ll be all set to water your garden using good old rainwater!