Darcy-Weisbach

PRESSURISED PIPE CALCULATOR

The darcy-weisbach equation is used to analyse pressurised pipes. For open channel flow see the Mannings calculator.

  • hL = Head loss (m)
  • f = Darcy friction factor
  • K = Minor loss factor
  • L = Pipe length (m)
  • D = Hydraulic diameter (m)
  • V = Average flow velocity (m/2)
  • g = Acceleration due to gravity (m/s²)
Reference Brown, Glenn. "The Darcy–Weisbach Equation". Oklahoma State University–Stillwater.

I want to find the of my

Cross Section Input

Width m
Height m

Cross Section Input

Pipe Diameter m

Other Inputs

Length m
Head Loss m
Roughness Ks m
Minor Loss K
Kinematic Viscosity m²/s

Outputs

Flow Velocity m/s
Flow Discharge m³/s
Reynolds Number
Friction Factor

Other Inputs

Length m
m³/s
Roughness Ks m
Minor Loss K
Kinematic Viscosity m²/s

Outputs

Head Loss m
Friction Factor
Reynolds Number
Flow Velocity
m/s

Other Inputs

m³/s
Head Loss m
Roughness Ks m
Minor Loss K
Kinematic Viscosity m²/s

Outputs

Length m
Friction Factor
Reynolds Number
Flow Velocity
m/s

Other Inputs

m/s
Length m
Head Loss m
Roughness Ks m
Minor Loss K
Kinematic Viscosity m²/s

Outputs

Hydraulic Diameter m
Friction Factor
Reynolds Number
Flow Discharge
m³/s

Other Inputs

m/s
Length m
Head Loss m
Roughness Ks m
Kinematic Viscosity m²/s

Outputs

Minor Loss K
Friction Factor
Reynolds Number
Flow Discharge
m³/s

Other Inputs

m/s
Length m
Head Loss m
Minor Loss K
Kinematic Viscosity m²/s

Outputs

Roughness Ks m
Friction Factor
Reynolds Number
Flow Discharge
m³/s