Hand Pumps

Part of Water Systems

How to build and maintain hand-operated pumps for drawing water from wells and low-lying sources.

Why This Matters

A hand pump transforms a dug well from an awkward excavation requiring rope and bucket into a reliable, sanitary water supply. The mechanical advantage of a lever pump handle means a child can lift water from 15 meters depth. The pump head seals the well against contamination. One person can maintain and repair a well-designed pump with basic tools.

Hand pumps are critical where gravity supply is impossible — the source is lower than the users, or no elevated spring exists. They are also the resilience backup for any community: when the gravity system fails or drought lowers reservoir levels, hand pumps from deep wells continue to produce.

The two fundamental pump types are the suction pump (limited to about 7 meters lift) and the force pump or bucket pump (effective to 30+ meters). Understanding which applies to your well depth determines everything about the mechanism you build.

Pump Physics

Suction limit: A suction pump works by creating a partial vacuum above the water. Atmospheric pressure (about 10.3 meters of water column at sea level) pushes water up into the vacuum. In practice, leakage and friction reduce this to a maximum usable suction lift of 6–7 meters. For wells deeper than this, the pump cylinder must be submerged or close to the water level — a force pump.

Force pump principle: A submerged piston pushes water upward through a pipe, overcoming the full head of the water column above. There is no theoretical depth limit, though friction and seal performance become challenging beyond 40–50 m.

Flow rate: A typical single-acting hand pump produces 20–30 liters per minute with one person pumping. A double-acting pump (pumping on both stroke directions) doubles this. Output decreases with depth because the force required increases.

Suction Pump Construction

Suitable for wells 0–6 meters deep. All components above ground — easy to maintain.

Components needed:

• Cylinder body: 75–100 mm bore, 300–400 mm long (wood bored out, or clay-fired ceramic, or iron pipe)
• Piston: turned wood or wrapped leather, fitted to cylinder bore with leather cup seal
• Two check valves: one at the cylinder base (inlet), one at the piston (delivery)
• Pump rod: wood or iron, connecting piston to handle
• Handle: lever arm, pivot-mounted on a post, ratio 3:1 or 4:1 (effort arm : pump rod arm)
• Drop pipe: from cylinder down into the well, open end submerged

Check valve construction: The check valve is the heart of the pump. It must open easily in one direction and seal completely in the other.

Simple flap valve: Cut a circle of stout leather 20% larger than the pipe bore. Fix one edge as a hinge. The valve opens downstream under flow, seals upstream under back pressure. Works well but leather degrades in water over 1–2 years.

Ball valve: A wooden or stone ball (slightly larger than the seat opening) lifts off its conical seat when flow passes, falls back under gravity to seal. The seat is a turned tapered bore in wood or a fired clay insert. Requires no special materials and lasts many years.

Assembly and installation:

1. Build the cylinder body — bore wood to 75–100 mm smooth bore, 400 mm length
2. Fit the inlet check valve at the base opening
3. Fit the delivery check valve in the piston center
4. Make the leather piston cup: a disc of firm leather cut to cylinder bore, wet and formed over a mandrel to create a cup shape, then dried. The cup lip faces downward (toward the water) and forms a seal against the cylinder wall.
5. Thread the piston onto the pump rod
6. Assemble cylinder with piston inside, connect drop pipe below
7. Mount handle lever with pivot pin; connect pump rod to short arm of lever
8. Install so drop pipe is submerged at least 300 mm below the lowest expected water level
9. Seal the cylinder top to the pump rod with a leather gland packed with tallow

Priming: The pump must be full of water to start. Pour water into the cylinder through the spout until full. Begin pumping; it may take 10–15 strokes before the suction lifts water. If it does not prime within 20 strokes, check for air leaks at joints.

Force Pump (Deep Wells)

For wells 6–30 meters. The cylinder sits at or near the water level, inside the well casing.

Cylinder location: The piston cylinder must be within 6 meters of the water surface inside the well. For a 20-meter well with 5 meters of water standing, the cylinder sits at 15–17 m depth (just above the water surface).

Long pump rod: A wood or iron rod extends from the deep cylinder up through the well to the handle at the surface. For 15–20 m depths, this rod is in 2–3 m sections joined with pin connections. The rod is under tension on the upstroke and compression on the downstroke — it must be stiff enough not to buckle in compression. Iron rod minimum 20 mm diameter; hardwood rod minimum 40 mm diameter.

Materials for a 15 m force pump:

• 3–4 m of 75 mm ID iron or ceramic pipe for the rising main (from cylinder to surface)
• Wooden pump cylinder (harder to access for maintenance but works well)
• Leather or rubber piston cup
• Four check valves (two in piston, two at cylinder base in double-acting design)
• 5 sections × 3 m wooden pump rod with iron pins
• Lever handle at surface
• Well head platform to support handle frame

Maintenance access: Mark the rod sections so they can be pulled individually. The lower sections come up through the pipe — require 2 people and a simple tripod lift. Service the cylinder seals every 1–2 years (more often in sandy water). Keep spare leather for piston cups.

Rope Pump (Low-Cost Alternative)

The rope pump is a ingenious design requiring minimal materials: a loop of rope with evenly-spaced discs passes through a vertical pipe from below the water surface to the pump head above, and back down the outside. Each disc lifts a column of water in the pipe on its way up.

Components:

• Continuous loop of rope (sisal, hemp, or synthetic)
• Discs: rubber, leather, or carved wood, 3–5 mm smaller than the pipe bore
• Pipe: 50 mm bore, any material, length from pump head to below water surface
• Drive wheel: bicycle wheel or wooden wheel at the top, turned by a handle
• Return guide: keeps the rope loop running straight below the wheel

Building a rope pump:

1. Set a 50 mm pipe vertically, bottom submerged in the well
2. Thread the rope through the pipe, over a grooved drive wheel, and back down outside the pipe
3. Attach discs to the rope at 300 mm spacing — each disc is a rubber or leather circle tied firmly to the rope
4. Fix a handle to the drive wheel
5. Turning the handle pulls rope (with discs) upward through the pipe, lifting water
6. Water discharges from the pipe top into a collection trough

The rope pump is especially suitable for large-diameter dug wells (1+ meter) where the pump mechanism can be lowered partway into the shaft. Maintenance is done at the surface — no need to pull anything from depth. A worn disc is replaced by cutting the rope, threading a new disc, and re-splicing.

Water Seal and Sanitation

A pump head without a proper well seal defeats the sanitation purpose of the pump. Install:

• Apron slab: A 1 m × 1 m concrete or stone slab around the pump head, sloped to drain spillage away from the well. Crack-free.
• Drainage channel: Leads spillage water at least 5 m from the well to prevent reinfiltration
• Well cover: Concrete slab or fitted lid over the entire well opening — no gap for insects, rodents, or contaminated runoff to enter
• Pump head seal: The pump rod or pipe passes through the well cover with a tight seal — sand and grit around the rod will score the cylinder and destroy the pump within months

A properly sealed well with a good hand pump reduces diarrheal disease incidence by 25–50% in village settings — one of the most cost-effective public health interventions available.