Hydraulic structures like river and canal outlets and culverts somelimes work under submerged conditions. For designing safe but economical energy dissipators for these outlets slructures, il is necessary to have a good lmowledge of at least the mean flow characleristics below them. If the outlet jet is far removed l'rom the confining boundaries, it could be analysed as a l'l'ce turbulent jet [1, 5, 13] (1). If it occupies the full widlh of lhe downstream channel and issues tangential to its bed, then it eould be treated as a plane turbulent wall jet [4, O, 6, 11]. If the full-widlh jel has an abrupt drop al lhe entrance, the flowcould he analysed as a plane turbulent realtached wall jet [8J. If it is a part-width jet with no drop, it could he analysed as a reslricted l'orIn of three dimensional wall jet [7 J. The case of parl-wid th rectangular jets with drop has recenlly been studied by Raj aratnam and Muralidhar [10 J. This paper presents the results of an experimental study of the diffusion helow certain non-rectangular outlets under suhmerged flow conditions.