Two experiments have been made to study the effect of the side walls on the behaviour of a plane turbulent wall jet, produced by a deeply submerged sluice gate in a rectangular channel. It was found that the transverse velocity distribution, even very close to the side walls, is similar and agrees with that of plane turbulent wall jet under zero pressure gradient. But the length scale becomes large in the vicinity of the walls and the wall jet appears to climb the side walls. Some observations have also been made regarding the distribution of the discharge intensity in the forward flow.