Hazen-Williams Hydraulic Grade Equation
This hydraulic grade formula is used in Hazen-Williams equations and the coefficient formula.
Hazen-Williams Hydraulic Grade Equation formulas |
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\(\large{ m = \left( \frac {v} { 1.318\;C \; r_h^{0.63} } \right) ^{\frac {1}{0.54} } }\) \(\large{ m = \left( \frac {Q} { 0.285\;C \; d^{2.63} } \right) ^{\frac {1}{0.54} } }\) |
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| Symbol | English | Metric |
| \(\large{ m }\) = hydraulic grade line slope | \(\large{ft}\) | \(\large{m}\) |
| \(\large{ Q }\) = flow rate | \(\large{\frac{ft^3}{sec}}\) | \(\large{\frac{m^3}{s}}\) |
| \(\large{ C }\) = Hazen-Williams coefficient | \(\large{dimensionless}\) | |
| \(\large{ r_h }\) = hydraulic radius | \(\large{in}\) | \(\large{mm}\) |
| \(\large{ d }\) = inside diameter of pipe | \(\large{in}\) | \(\large{mm}\) |
| \(\large{ v }\) = mean flow velocity | \(\large{\frac{ft}{sec}}\) | \(\large{\frac{m}{s}}\) |
Tags: Hydraulic Equations Open Channel Equations Hazen-Williams Equations