Dewatering Pump Calculator
Calculate dewatering pump requirements including inflow rate, pump capacity, horsepower, and discharge pipe sizing for excavations.
Inputs
sq ft
ft
ft/min
ft
ft
Results
Seepage Inflow
80.28 GPM
Required Pump Capacity
120.42 GPM
Pump Horsepower0.56 HP
Number of Pumps1
Discharge Pipe Size3 in
How to Use This Calculator
- Enter Excavation Area in sq ft and Depth in feet to define the volume to dewater.
- Set Soil Permeability — higher permeability (gravel/sand) means faster inflow and a larger pump.
- Enter Pumping Distance (ft) and Total Head to account for pipe friction and elevation.
- Read Required Pump Capacity (GPM), Pump Horsepower, and Number of Pumps to spec equipment.
- Use Discharge Pipe Size to size the discharge header and plan site drainage.
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