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Laboratory study on effects of vegetations on the open channel hydraulic roughness (Pennisetum Purpureum and Ipomoea Aquatica)

Unrestricted growth of such vegetation in an open channel can lead to its complete loss of the hydraulic capacity 
which has potential to generate flood. A laboratory study has been conducted to analyze the effects of different 
types of vegetation to the velocity and on the Manning roughness coefficient (n) in an open channel, and to 
develop relationships between the characteristics of the vegetation (density, type and distribution) on the 
hydraulic roughness. Plants namely Napier grass and Ipomoea Aquatica have been selected for this study. From 
the conducted experiments, the roughness of Napier Grass is in the range of 0.0002 – 0.0073 and Ipomoea 
Aquatica is 0.0002-0.0062. It was also found that the Manning’s n value has a linear relationship with flow 
depth, vegetation arrangements and density.