The inner surface of the dam is curved, which affects the curvilinear surface

find the pressure force and the pressure center. Calculate it for the unit width. Take it as Z=2x.

(Things to note when solving: The horizontal and vertical components will be calculated separately, when taking the projection area for the horizontal component, the volume for the vertical component will be determined by integral, the vertical component will become calculable after the volume is found)

the density of the fluid=9806

g=9.81

x=2 m

y=8 m