English: This X-Y plot describes n-value as a function of median bed material grain size as predicted by Strickler's equation. Predicted n-values range from 0.019 for 4 millimeter (mm) gravel to 0.03 for 64 mm gravel. Strickler's equation relates n-value to the sixth root of grain size; therefore, the rate of increase in n-value decreases as grain size increases.
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Captions
Strickler's equation describes n-value, a measure of hydraulic roughness, as a fuction of the median diameter of gravel on a river bed.