Hazen-Williams Hydraulic Grade
In Hazen-Williams coefficient, the hydraulic gradient is one of the parameters used in the equation to calculate the flow rate of water through a pipe. The hydraulic grade, or hydraulic gradient, is a parameter in hydraulic engineering, as it helps determine the direction and rate of flow of water in a pipe or open channel. It takes into account the elevation changes and head losses along the flow path.
Hazen-Williams hydraulic grade formula |
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\( m = ( v \;/\; C \; 1.318 \; r_h^{0.63} )^{1 / 0.54} \) (Hazen-Williams Hydraulic Grade) \( v = C \; 1.318 \; r_h^{0.63} \; m^{0.54} \) \( C = v \;/\; 1.318 \; r_h^{0.63} \; m^{0.54} \) \( r_h = ( v \;/\; C \; 1.318 \; m^{0.54} )^{1 / 0.63} \) |
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Solve for mSolve for vSolve for CSolve for rh |
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| Symbol | English | Metric |
| \( m \) = hydraulic grade line slope | \( dimensionless \) | |
| \( v \) = mean flow velocity | \(ft \;/\; sec\) | \(m \;/\; s\) |
| \( C \) = Hazen-Williams coefficient, see below for values | \( dimensionless \) | |
| \( r_h \) = hydraulic radius | \( ft \) | \( m \) |
Hazen-Williams hydraulic grade formula |
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\( m = ( Q \;/\; C \; 0.285 \; d^{2.63} ) ^{1/0.54} \) (Hazen-Williams Hydraulic Grade) \( Q = C \; 0.285 \; d^{2.63} \; m^{0.54} \) \( C = Q \;/\; 0.285 \; d^{2.63} \; m^{0.54} \) \( d = ( Q \;/\; C \; 0.285 \; m^{0.54} ) ^{1/2.63} \) |
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Solve for mSolve for QSolve for CSolve for d |
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| Symbol | English | Metric |
| \( m \) = hydraulic grade line slope | \( dimensionless \) | |
| \( Q \) = flow rate | \(ft^3 \;/\; sec\) | \(m^3 \;/\; s\) |
| \( C \) = Hazen-Williams coefficient, see below for values | \( dimensionless \) | |
| \( d \) = pipe inside diameter | \( in \) | \( mm \) |
