Measure of frictional resistance water experiences when passing over land and channel features
Hydraulic roughness is the measure of the amount of frictional resistance water experiences when passing over land and channel features.[1]
One roughness coefficient is Manning's n-value.[2] Manning's n is used extensively around the world to predict the degree of roughness in channels. Flow velocity is strongly dependent on the resistance to flow.[3] An increase in this n value will cause a decrease in the velocity of water flowing across a surface.[4]
^Fard, R., Heidarnejad, M., & Zohrabi, N. (2013). Study Factors Influencing the Hydraulic Roughness Coefficient of the Karun River (Iran). International Journal of Farming and Allied Sciences, 2(22), 976-981. ISSN 2322-4134