Gravity-Fed Water Distribution — FarmPal

Design and build a water distribution system that uses gravity instead of pumps. By placing storage above your points of use, you get reliable water pressure with zero energy cost and zero mechanical failure points.

How It Works

Water from a spring, rainwater tank, or pump-filled elevated tank flows downhill through pipes to all points of use. Every foot of elevation provides 0.433 PSI of pressure. A tank 100 feet above your house gives 43 PSI equal to municipal water pressure.

Site Requirements

  • •Elevation difference between source and points of use
  • •Route for buried pipe (avoid rock outcrops)
  • •Tank location at sufficient height for desired pressure
  • •Access for pipe installation (trenching or surface)
  • •Freeze protection in cold climates (bury below frost line)

Components

Elevated Storage Tank
Provide head pressure through elevation
$200-2,000 (tank) + $0-5,000 (tower if needed)
Main Distribution Pipe
Carry water from tank to distribution points
$0.50-3/foot
Pressure Reducing Valve
Limit pressure if head is too high
$30-100
Float Valve
Auto-fill tank from source without overflow
$15-50
Frost-Free Hydrants
Provide water access points that won't freeze
$80-200 each

Sizing Guide

Pipe size and tank elevation determine flow and pressure

Formula
Pressure (PSI) = Elevation (ft) × 0.433 | Flow depends on pipe diameter, length, and pressure
DIY Minimum
$200 (short run from hillside spring/tank)
DIY Typical
$1,000-5,000 (full farm distribution)
Professional
$5,000-20,000 (complex multi-building system)
Annual Maint.
$0-100 (inspect valves, check for leaks)

DIY Steps

1
Elevation Survey

Map your property elevations. Identify the highest practical tank location and all water demand points. Calculate head pressure at each point.

⏱ 1 day
2
Pipe Sizing & Layout

Size pipe for required flow rate at given head. Plan route avoiding obstacles. Include air vents at high points and cleanouts at low points.

⏱ 1 day planning
3
Trenching & Installation

Dig trench below frost line (4-6 feet in cold climates, 12-18" in mild). Lay pipe on sand bed, backfill. Install hydrants and tees at use points.

⏱ 2-7 days depending on distance

✓ Pros

  • •Zero energy cost gravity is free and never breaks
  • •No pumps, no electricity, no mechanical failure
  • •Provides water during power outages
  • •Extremely reliable can last 50+ years
  • •Low maintenance compared to pressurized pump systems

⚠️ Safety

  • •Bury pipe below frost line to prevent freeze damage
  • •Include pressure relief on any closed section
  • •Ensure tank is structurally sound and properly supported
  • •Elevated tanks on towers must be engineered for wind and seismic loads