The objective of this research work is to understand the behavior of water flow through gradual contraction. Computational Fluid Dynamics (CFD) is a useful approach to solving equations that describe fluid motion using numerical methods and computational techniques; this area of mechanics provides the fundamentals of piping hydraulics and channel hydraulics. A study of flow through the pipe has been conducted to calculate losses in changes in geometry. Energy losses due to cross-sectional area change is an important part of analyzing flow through pipelines. The velocity profiles were determined due to the change of section in the piping systems. Calculations were used using the K-épsilon model of the software. This simulation provides the values of pressure contours, velocity and kinetic turbulence in various sections of the pipeline where water is the fluid.