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Pressure on Submerged Curved Surfaces Equation

 
The hydrostatic pressure on a submerged curved surface (Fig. 1) is given by:
 
 
Where:
 
P = total pressure force on the surface
PHforce due to pressure horizontally
PVforce due to pressure vertically
 

Figure 1
Hydrostatic pressure on a submerged curved surface. (a) Pressure variation over the surface. (b) Free-body diagram.