A three dimensional non-suspension type density current modelled by releasing denser saltwater from the top of sloping plane boundary immersed in lighter freshwater. Flow examined at different slopes. At times Richardson number sufficiently predicts flow behaviour. Velocity profiles are self preserving in outer region of flow while density profile self preserving. Inner regions differ. Variation in characteristic velocity, density, width and height scales at a cross section with distance from orifice were examined. Disparity between measured and predicted relations may be due to turbulence damping effect of steep density gradient occurring in inner region of flow adjacent to the boundary plane. Entrainment constant was found to decrease and Local Richardson number to increase in the direction of flow. This contrasts with the two dimensional case.