Setting up a rain barrel system requires choosing the right downspout, building a level base, cutting the downspout to fit a diverter, and routing overflow at least 4–6 feet from your home’s foundation.
, so the first priority is the ground underneath. Getting the base right, choosing the downspout, and handling overflow before rain keeps the system stable for years. Here’s how to do it in order, including what not to do.
Choosing the Downspout and the Barrel Spot
Pick a downspout draining a roof area you want to capture. Place the barrel directly beneath it at final height on reasonably level ground. Avoid spots where soil stays soft or collects puddles — the barrel can sink unevenly under full weight. Elevate the barrel 12 to 24 inches on concrete blocks, cinder blocks, or a sturdy wooden crate for gravity pressure at the spigot. Stack blocks in a crisscross pattern if more than one high to reduce tipping risk.
Building a Stable, Level Base
Clear turf and tamp the ground flat before placing anything. On bare soil, a full barrel settles unevenly in the first season. Set your platform on the compacted spot and level it with a spirit level. A wobbling barrel strains the downspout connection and can tip in a heavy storm. Leave room to reach the spigot and overflow, plus clearance above to remove the barrel for winter storage or cleaning.
Cutting the Downspout and Installing the Diverter
Measure barrel height from base to water entry point. Mark that height on the downspout so the elbow or diverter sits just above the barrel opening. For aluminum downspouts, remove screws, cut with a hacksaw, and reattach. PVC downspouts often use cement at the elbow, so cut the straight section above. Leave a gap so the barrel can shift or be removed. Fit the elbow or diverter to flow directly into the screened barrel opening. Every opening must be covered with fiberglass screen or fine mesh to exclude leaves, roof grit, and mosquitoes. Leave at least a 1-inch rim on the barrel top to secure screen with a hose clamp or zip tie. Test the seal with a hose.
Overflow Routing: The Most Overlooked Step
A full rain barrel with no overflow will spill water toward your foundation. Attach a hose or pipe to the overflow valve and route it 4–6 feet away into a garden bed, lawn, or rain garden. Never let it drain against the foundation wall. Test by running a hose into the barrel until overflow occurs; confirm water exits where intended. Fix leaks now, not during a storm.
Common Mistakes That Ruin a Rain Barrel Setup
- Soft or unlevel ground — a full barrel sinks and tilts, straining connections. Compact and level the base.
- No overflow plan — water spills toward foundation. Route it away before first rain.
- Downspout cut too short — prevents barrel removal for winter or cleaning. Leave a few inches clearance above barrel top.
- Missing screen mesh — mosquitoes breed in standing water; debris clogs spigot. Cover every opening.
- Skipping the water test — leaks are easy to fix dry, impossible mid-storm. Test everything with a hose first.
Before freezing weather, reattach the downspout section and store the barrel in a shed or garage, or invert it to prevent ice cracking.
FAQs
Should I raise the barrel or set it on the ground?
Raise it 12–24 inches for gravity pressure at the spigot and direct watering can filling. On-ground barrels need a pump or siphon.
Can I connect multiple rain barrels together?
Yes, link the overflow of one to the inlet of the next with a connecting hose. Keep barrels on the same level base and use matching overflow fittings.
How close to the house should the barrel sit?
Place it directly under the downspout, but route overflow water 4–6 feet from the foundation. The barrel can be tight to the wall as long as overflow exits well clear of the house.
References & Sources
- Chesapeake Bay Program. “How to Build a Rain Barrel.” Step-by-step guide for constructing and installing a rain barrel system.
- University of Arkansas Cooperative Extension Service. “How to Build a Rain Barrel.” Detailed instructions including hole sizes, screen placement, and winter storage.
- Southwest Florida Water Management District. “Rain Barrels.” Homeowner guidance on installation, overflow routing, and maintenance.