Hydraulic Ram Pump & Lift Water With No Fuel
Lifts water
Enter supply flow, fall height and delivery lift to estimate the delivery flow and the daily volume a hydram can push uphill — with no fuel or electricity.
Hydraulic ram pump
Next: a ram running 24/7 here yields 3,456 L/day with no fuel — size your storage tank to this and add a delivery check valve; more fall or less lift boosts the rate.
Delivery scales with the fall-to-lift ratio and pump efficiency (typically 40–70%). A ram delivers a small steady trickle continuously, not a large burst.
Hydraulic ram pump — key facts
- Delivery flow
- Supply × (fall ÷ lift) × efficiency
- Power needed
- None — driven by falling water
- Typical efficiency
- ≈ 50–70%
- Minimum fall
- ≈ 1 m or more
- Runs
- Continuously, day and night
- Moving parts
- Just two valves
- Best for
- Hilly streams & springs
- Privacy
- Runs in your browser; nothing uploaded
A pump that runs on falling water alone
A hydraulic ram is one of the cleverest machines on a farm: it lifts water uphill with no fuel, no electricity and no motor. It uses the momentum of a larger flow falling a small height to slam a valve shut, and the resulting pressure surge pushes a fraction of that water far higher than it fell. Set up on a hillside stream or spring, it cycles several times a minute, around the clock, for years — costing nothing to run.
This tool estimates the delivery flow, daily delivery volume, fall height and lift height for your setup, using delivery ≈ supply × (fall ÷ lift) × efficiency. Use it to check whether a stream can supply a tank, trough or gravity drip block on the hill above, and to size the fall and pipework before you build. Pair it with the Irrigation Pump Power, Pump Run Time and Solar Pump Sizing tools to compare your off-grid lifting options.
Zero running cost
No fuel, no power — driven by falling water.
Works off-grid
Perfect for remote hilly streams and springs.
Runs around the clock
Continuous flow adds up to big daily volume.
Size before you build
Check delivery against fall, lift and supply.
Frequently Asked Questions
What is a hydraulic ram pump?+
A hydraulic ram (or hydram) is a pump that lifts water using only the energy of falling water — no fuel, electricity or moving motor. A larger flow falling a small height (the drive head) builds pressure that pushes a small fraction of that water much higher (the delivery head), cycling automatically day and night for years with almost no maintenance.
How does a ram pump work?+
Water flows down the drive pipe and out a waste valve until the rushing flow slams the valve shut. The sudden stop creates a pressure surge (water hammer) that forces a slug of water past a one-way valve into an air chamber and up the delivery pipe. The cycle then repeats, several times a minute, on its own.
How is the delivery flow calculated?+
A simple working estimate is delivery flow ≈ supply flow × (fall ÷ lift) × efficiency. So if 60 L/min falls 3 m and you lift to 30 m at 60% efficiency, delivery ≈ 60 × (3 ÷ 30) × 0.6 ≈ 3.6 L/min. The more you lift relative to the fall, the less water reaches the top.
What is the fall (drive head) versus the lift (delivery head)?+
The fall is the vertical drop from the water source to the pump that drives it; the lift is the vertical height from the pump up to where you want the water delivered. A ram pump trades volume for height — using a big flow falling a little to send a small flow up high.
What efficiency should I expect?+
Typical hydram efficiency is around 50–70%, depending on the fall-to-lift ratio, pipe sizing and valve tuning. Efficiency is highest when the lift is a modest multiple of the fall; very high lifts relative to the fall deliver less water and lower efficiency. The tool lets you set your expected efficiency.
How much water can a ram pump deliver in a day?+
Because it runs continuously, even a modest delivery flow adds up. A pump delivering 3.6 L/min runs all day to give about 3.6 × 60 × 24 ≈ 5,200 L/day. The tool multiplies your delivery flow by the running hours so you can see the daily volume for tanks, troughs or drip.
Where is a hydram ideal?+
Anywhere with a flowing stream or spring and some fall — classic hilly and remote settings with no grid power and no fuel budget. It's perfect for lifting water from a valley stream up to a farmhouse, livestock trough, storage tank or gravity-fed drip block on the hillside above.
What are the limits of a ram pump?+
It needs a continuous drive flow and a usable fall (often at least about a metre), and it only delivers a fraction of the supply — the rest leaves through the waste valve (which can be returned to the stream). It can't be used where there's no fall, and very high lifts give small yields.
Does it need any power or maintenance?+
No external power at all — it is driven entirely by the falling water, runs unattended around the clock, and has only two valves as moving parts. Maintenance is minimal: occasional cleaning, checking the air chamber and adjusting the waste valve. That low running cost is what makes the hydram so attractive off-grid.