The discharge and entrance flow velocity were controlled by a flow meter and the water level was adjusted by a gate system setting at the end of the flume. In all the experimental runs the water level was trying to keep approximately in 0.15 m. In order to measure the entrance flow velocity, first of all the flow meter sensor was installed near to the channel inlet on the channel bed. Since flow meter is able to measure the discharge and the water level, by setting the channel width, 0.303 m, into the flow meter it shows the velocity on its screen. It should be noted that the entrance discharge and the water level were already adjusted by pump and gate systems, respectively.