Hydraulic roughness

Hydraulic roughness is the measure of the amount of frictional resistance water experiences when passing over land and channel features. It quantifies the impact of surface irregularities and obstructions on the flow of water. One roughness coefficient is Manning's n-value. Manning's n is used extensively around the world to predict the degree of roughness in channels. The coefficient is critical in hydraulic engineering, floodplain management, and sediment transport studies. Flow velocity is strongly dependent on the resistance to flow. An increase in this n value will cause a decrease in the velocity of water flowing across a surface.

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