Hazen-Williams method is only valid for water flowing at ambient temperatures, the Darcy-Weisbach method should be used for other liquids or gases. The Hazen-Williams Equation can be used for flow through an open channel or through a pressurized pipe.
Hazen-Williams Flow Through an Open Channel Equation
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| \( v \;=\; k \cdot C \cdot r_h^{0.63} \cdot m^{0.54} \) | ||
| Symbol | English | Metric |
| \( v \) = Mean Flow Velocity | \(ft\;/\;sec\) | \(m\;/\;s\) |
| \( k \) = Conversion Factor | \(dimensionless \) | \(dimensionless \) |
| \( C \) = Hazen-Williams Coefficient | \( dimensionless \) | \(dimensionless \) |
| \( m \) = Hydraulic Grade line Slope | \( ft \) | \(m \) |
| \( r_h \) = Hydraulic Radius | \( ft \) | \( m \) |
