The scour on hydraulic structures could be reducing its stability due to the caused foundations damage. This study aims to propose an approach for estimating the shape and the depth of the scour hole on rocks. In this study, integrated jet pressure fluctuation and threshold stream power to estimate scour whole shape. The calculation works using MATLAB program for tool, the source code is written by the authors. When given an appropriate interval, analysis range, generated a two-dimensional grids in the flow direction and depth direction. Furthermore, partial modify were made to previous research results which including impinge angle and flow rate changed with time. Compare the threshold stream power with the calculated jet stream power at each grid on matrix. When the threshold stream power value less than the jet stream power value at node, it means that scouring will occur at the grid, the location of grid will be recorded. Several dam or wire sites information were collected and compared with approach method. The results were compared with field data; the compared results show that the approach method has obvious improvement compared with previous research methods.