Hazen-Williams Head Loss due to Friction Formulas |
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\( h_f \;=\; \dfrac{ 4.73 \cdot l_p \cdot \left( \dfrac{Q}{C} \right)^{1.852} }{ d^{4.87} }\) (US units) \( h_f \;=\; \left( 4.73 \cdot \left( \dfrac{Q}{C} \right)^{1.852} \right) \cdot \dfrac{l_p}{d^{4.87} } \) (US units) \( h_f \;=\; \left( 10.7 \cdot \left( \dfrac{Q}{C} \right)^{1.852} \right) \cdot \dfrac{l_p}{d^{4.87} } \) (SI units) |
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| Symbol | English | Metric |
| \( h_f \) = Head Loss due to Friction | \(ft\) | \(m\) |
| \( Q \) = Flow Rate | \(ft^3\;/\;sec\) | \(m^3\;/\;s\) |
| \( C \) = Hazen-Williams Coefficient | \(dimensionless\) | \(dimensionless\) |
| \( l_p \) = Pipe Length | \(ft\) | \(m\) |
| \( d \) = Inside Diameter of Pipe | \(in\) | \(mm\) |
This head loss due to friction formula is used in Hazen-Williams equations.
