Riprap Rock Size
Riprap Rock Size Formula |
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| \( D \;=\; v^2 \;/\; 2 \; g \; c^2 \; (s - 1) \) |
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| Symbol | English | Metric |
| \( D \) = Median Diameter of Spherical Stone or Rock | \(in\) | \(mm\) |
| \( v \) = Water Velocity Approaching the Riprap | \(ft\;/\;sec\) | \(m\;/\;s\) |
| \( g \) = Gravitational Acceleration | \(ft\;/\;sec^2\) | \(m\;/\;s^2\) |
| \( c \) = Isbash Constant (c = 0.86 for Highly Turbulent Conditions or c = 1.2 for Low Turbulence) | \(dimensionless\) | \(dimensionless\) |
| \( s \) = Specific Gravity of Stone or Rock (Typically Varies from 2.56 to 2.92 Depending on the Rock Material. A Commonly Used Value is 2.65.) | \(dimensionless\) | \(dimensionless\) |
Tags: Hydrology