Save Thousands With This Backyard Rainwater Catchment & Gravity Setup
By Survival Garden Company • Off-Grid Water Engineering
Municipal water costs and well pump power outages can quickly compromise a garden during hot summer dry spells. Capturing pure rainwater off your roof gives you thousands of gallons of zero-cost irrigation.
💧 Sizing Your Exact Rainwater Storage
Calculate roof runoff volume and drought storage needs for your specific roof size.
Launch Rainwater Calculator →The Rain Catchment Formula
Gallons = Roof Sq Ft × Rainfall Inches × 0.623 × 0.90 Efficiency
- A 1,500 sq ft roof yields 841 gallons of water per 1 inch of rain.
- Elevating linked IBC totes 4 to 6 feet provides sufficient head pressure for low-pressure drip irrigation tape.
- A simple vertical PVC first-flush pipe diverts the initial dirty wash containing shingle grit and pollen.
Build an Off-Grid Homestead Water System
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