In this work, we studied the dimensions of stream tube in the vertical as well as inclined bank conditions. Data were co-llected from both a physical model and a 3-D numerical model (SSIIM 2). Equations for predicting stream tube dimensions were presented and compared with existing formulae. In comparison with vertical bank, it is found that inclining bank causes the bottom stream tube width to be greater than at the surface. The strength of secondary current formed at the entrance of branch channel is reduced. These changes in flow pattern can reduce the amount of sediment delivery into the intake.