Curb gutter roadway cross slope are design features of a street that work together to manage stormwater runoff. The roadway cross slope is the angle at which the surface of the road is inclined from the center towards the edges. This gentle slope, typically expressed as a percentage, ensures that rainwater flows laterally off the driving lanes.
Curb gutter Roadway Cross Slope formula |
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\( m_c \;=\; \left( \dfrac{ Q \cdot n }{ 0.56 \cdot m_l^{1/2} \cdot q^{8/3} } \right)^{3/5}\) (Curb Gutter Roadway Cross Slope) \( Q \;=\; \dfrac{ 0.56 }{ n } \cdot m_c^{5/3} \cdot m_l^{1/2} \cdot q^{8/3} \) \( n \;=\; \dfrac{ 0.56 }{ Q } \cdot m_c^{5/3} \cdot m_l^{1/2} \cdot q^{8/3} \) \( m_l \;=\; \left( \dfrac{ Q \cdot n }{ 0.56 \cdot m_c^{5/3} \cdot q^{8/3} } \right)^2\) \( q \;=\; \left( \dfrac{ Q \cdot n }{ 0.56 \cdot m_c^{5/3} \cdot m_l^{1/2} } \right)^{3/8} \) |
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| Symbol | English | Metric |
| \( m_c \) = Roadway Cross Slope | \(dimensionless\) | - |
| \( Q \) = Gutter Flow Rate | \(ft^3 \;/\; sec\) | - |
| \( n \) = Manning's Roughness Coefficient | \(dimensionless\) | - |
| \( m_l \) = Gutter Longitudinal Slope | \(dimensionless\) | - |
| \( q \) = Gutter Flow Width | \(ft\) | - |
