Plan effective water removal on any site with accurate pump sizing. Enter inflow lift pipe details and losses. See total dynamic head power and capacity. Get fast guidance safety factors and a clear breakdown for reliable field decisions. Supports metric and imperial inputs with friction and fittings and hose runs for realistic outputs everywhere
A dewatering pump moves unwanted water from excavations foundations tunnels or flooded areas to keep work conditions safe and stable. Correct sizing matters because flow can surge and head losses rise across hose runs bends and elevation. If the pump is too small flooding persists schedules slip and equipment suffers. If oversized energy is wasted priming may fail and portability drops. Balanced sizing delivers dependable removal and efficient operation daily
1) Which unit system does this support?
Metric inputs in m³ per hour meters and millimeters and Imperial inputs in gallons per minute feet and inches are supported with automatic conversion.
2) What safety factor should I use?
Typical projects use 1.1 to 1.3 to cover inflow spikes and uncertainties. Higher values increase pump size and power.
3) How is friction loss calculated?
The calculation uses the Darcy Weisbach method with a Swamee Jain friction factor and adds minor losses for valves elbows entrance exit and foot or check valves.
4) Why is NPSH important?
Insufficient NPSH causes cavitation which damages impellers and cuts performance. Keep available NPSH higher than the pump curve requirement.
5) What if I only know friction per 100 units?
You can approximate by converting manufacturer tables into equivalent head using velocity head. For higher accuracy provide hose diameter length and fittings count.
6) Can this handle fluids other than water?
This model assumes clean water. For slurries or high temperature fluids adjust density viscosity and losses using conservative safety factors and consult pump curves.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.