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+// A Textbook of Fluid Mecahnics and Hydraulic Machines - By R K Bansal
+// Chapter 3-Hydrostatic Forces on surfaces
+// Problem 3.11
+
+//Data given in the Problem
+d=0.5
+D=1
+SG=0.8
+dens=1000
+dens1=SG*dens
+w=2
+g=9.81
+
+//calculations
+//1)total pressure 
+pA=0
+pD=dens1*g*D
+pB=pD+dens*g*d      //Pressure on the base
+F1=1/2*D*pD*w
+F2=(d*pD)*w
+F3=1/2*d*(pB-pD)*2
+F=F1+F2+F3
+mprintf("The total pressure on one side of the wall is %f N\n",F)
+
+//Centre of pressure
+//we know , from geametry that
+h=((F1*2/3*D)+(F2*(D+0.5*d))+(F3*(D+2/3*d)))/F
+mprintf("The centre of pressure is %f m from the top",h)
+