General Hydraulic Characteristics of an Open Channel with Narrow Path

This study uses laboratory and theoretical experiments considering upstream, narrow and downstream sections of the channel in its normal and inundated state conditions. In a normal state condition, results proved that as the cross-section of a channel decreases, the higher the velocity and maximum water depth occurs. Asymmetry of flow was caused by the occurrence of different velocities and pressures at the exit right and left sides section of a narrow path and was dependent on the initial boundary conditions applied at upstream section of the channel. On the other hand, bank overflow starts to inundate where maximum water depth occurs during the normal state condition then goes to the floodplain upstream side direction. Moreover, Ishikawa's theoretical overflow equation correlates with the laboratory and theoretical results. Understanding the flow characteristics of a channel will allow us to predict and identify the direction and extent of damage in case of flood.