Rain Barrels for Garden Irrigation
Rain barrels collect runoff from roofs and store it for later use.
They can be useful for:
- Containers
- Flowers
- Shrubs
- Small garden areas
But they are not usually enough to irrigate a large garden through a long drought.
How Much Water Can You Collect?
One inch of rain falling on 1,000 square feet of roof produces roughly:
- 620 gallons of water
A 50-gallon barrel can fill surprisingly quickly.
Basic Setup
A rain barrel typically includes:
- Covered barrel
- Downspout connection
- Screen
- Overflow outlet
- Spigot
Keep Mosquitoes Out
Use a tight screen over all openings.
Do not leave open standing water.
Provide Overflow
Once the barrel is full, water needs somewhere to go.
Direct overflow:
- Away from foundations
- Toward safe drainage areas
Elevate the Barrel
Raising the barrel creates more gravity pressure.
Use a strong level base.
Remember:
A full 50-gallon barrel weighs more than 400 pounds.
Gravity Pressure Is Low
Rain barrels do not produce household water pressure.
They work best with:
- Watering cans
- Short hoses
- Low-pressure drip systems designed for gravity feed
Roof Water Considerations
Roof runoff can contain:
- Dust
- Bird droppings
- Roofing residues
- Airborne contaminants
For edible crops, use collected rainwater thoughtfully and avoid spraying harvested produce directly when water quality is uncertain.
Apply to the soil rather than leaves or edible portions.
Keep the Barrel Covered
A secure lid helps prevent:
- Mosquitoes
- Debris
- Animals
- Accidents
Clean Periodically
Flush sediment and clean screens.
Inspect gutters and downspouts.
GardenGrowz Tip
Think of a rain barrel as stored supplemental water—not an endless irrigation supply.