Rain Barrel Systems — FarmPal

Key Points

• 💧1 inch of rain on a 1,000 sq ft roof = ~600 gallons of water
• 💧A single rain barrel (55 gal) fills in about 10 minutes of moderate rain
• 💧First-flush diverters remove initial dirty roof runoff
• 💧Overflow planning is essential more water WILL come
• 💧Check local laws most US states now explicitly allow rainwater harvesting

Installation Steps

1. 1Calculate roof collection area and annual rainfall potential
2. 2Choose barrel (food-grade 55-gallon drums are ideal and often free)
3. 3Install gutter downspout diverter or direct connection
4. 4Add screen at inlet (mosquito prevention non-negotiable)
5. 5Install spigot near bottom, overflow near top
6. 6Connect overflow to second barrel, rain garden, or drainage
7. 7Elevate barrel on cinder blocks for gravity-fed pressure
8. 8Install first-flush diverter for cleanest water

Tips

• 💡Dark-colored barrels prevent algae growth better than light colors
• 💡Connect multiple barrels in series for larger capacity
• 💡Use for garden irrigation not drinking without proper filtration
• 💡Winterize: drain before first hard freeze, or use heating element
• 💡2025 research: rainwater-irrigated vegetables had comparable safety to municipal water