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diff --git a/3683/CH13/EX13.1/Ex13_1.sce b/3683/CH13/EX13.1/Ex13_1.sce
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+sigma_cbc=7//in MPa
+sigma_ct=1.2//in MPa
+sigma_st=100//in MPa
+m=13.33//modular ratio
+V=200000//capacity, in L
+V=V/10^3//in cu m
+h=2.5//assumed depth of water in tank, in m
+A=V/h//area of tank, in sq m
+B=sqrt(4/%pi*A)//diameter, in m
+B=10.1//assume, in m
+H=h+0.5//including freeboard, in m
+w=10//unit weight of water, in kN/cu m
+T=w*H*B/2//hoop tension, in kN
+Ast=T*10^3/sigma_st//in sq mm
+s1=10^3*0.785*16^2/Ast//in mm
+s1=130//assume, in mm
+t=(T*10^3/sigma_ct-(m-1)*Ast)/1000//in mm
+t=110//assume, in mm
+//hoop tension steel at 1.5 m below top of wall
+h=1.5//in m
+T=w*h*B/2//in kN
+Ast=T*10^3/sigma_st//in sq mm
+s2=10^3*0.785*16^2/Ast//in mm
+s2=260//assume, in mm
+Ads=0.3/100*t*10^3//vertical steel as distribution steel, in sq mm
+s3=1000*0.785*10^2/Ads//in mm
+s3=235//in mm
+//design of tank floor
+D=150//in mm
+Ast=0.3/100*D*1000//in sq mm
+s4=1000*0.785*10^2/Ast//in mm
+s4=170//in mm
+mprintf("Summary of design\nDiameter of tank=%f m\nDepth of tank=%d m\nTank wall thickness=%d mm\nSteel-hoop steel; 3 m to 1.5 m below top=16 mm dia @ %d mm c/c\n1.5 m to 0 m below top=16 mm dia @ %d mm c/c\nvertical steel=10 mm dia @ %d mm c/c\nTank floor: Thickness %d mm\nSteel=10 mm dia @ %d mm c/c",B,H,t,s1,s2,s3,D,s4)
+//answer in textbook for spacing of 16 mm dia bars from 1.5 m to 0 m below top is incorrect