In this experimental work, laboratory channel was constructed to evaluate the hydrodynamics of flow through cow grass. Acoustic Doppler Velocimeter (ADV) was used in determining the magnitude of velocity across various segments of the channel due to flow vegetation� interaction. The effect of vegetative roughness on flow velocity, Manning�s resistance, and velocity profiles were investigated. Results revealed the changes in the normal parabolic velocity profile to nearly flat in the streamwise direction. İt was also observed that the Manning�s coefficient generally decreases with rise in velocity of flow, and it increases with increase in the fractional flow depths, as the grass was completely submerged. Thus, the relationships and n�V curve obtained could be use in proper design of grassed channels. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2021.