This research presented the experimental study of improving flow conditions in pump-sump provided with an axial or mixed pump, and vertical suction pipe, to ensure reducing the minimum needed submergence of the sump. A physical model of rectangular shaped pumpsump had been studied, with a scale 1\10 , according to Froude Model. Three modifications had been added, including: floating element, conical element, and the third one consists of both of them. The flow had been watched for vortices observation whether surface or subsurface. Piezometric pressures had been measured at eight points, distributed equally on the suction pipe perimeter near pump impeller, in addition to swirl degree measure near pump impeller too. The results showed that the floating element, set behind the suction pipe, is the most appropriate and most effective solution to reduce the submergence in pump-sump in way which the other hydraulic criterions, which control the flow stability towards the suction pipe in the sump, don't be affected negatively.