Wells & water/ CALCULATOR
Combine lift, delivery pressure and friction in a first-pass pump calculation.
FROM ESTIMATE TO ACTION
Use the elevation rise from the pumping water level to that point, not borehole depth or pump installation depth. Enter the required gauge pressure at the same point in bar. Estimate pipe, fitting and filter head losses at the entered flow; do not add drawdown again.
Find the required flow and calculated head together on the manufacturer’s pump curve. Maximum flow and shutoff head are different endpoints, not one operating point. Confirm the well’s supply with a pumping test; this calculation does not establish sustainable yield.
Use combined wire-to-water efficiency at the operating point, not motor efficiency alone. The kW result estimates steady electrical input, not shaft output or starting demand. Use manufacturer starting data and a qualified electrical design for a generator, cable or protection.