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diff --git a/2513/CH2/EX2.4/2_4.sce b/2513/CH2/EX2.4/2_4.sce
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+clc
+//initialisation of variables
+p1=10//mgd
+p2=6940//gpm
+w=67000//people
+d=2//min
+v=d*p2/d//gal
+v1=98.2//cu ft each
+q=30//min
+q1=q*p2/d//gal
+q2=13900//cu ft
+a=1390//sq ft
+s=2//hr
+s1=120*p2/d//gal
+s2=55700//cu ft 
+s3=s2/8//sq ft
+r=3//gpm/sq ft
+r1=6//rapid
+//CALCULATIONS
+D=sqrt(v1*4/%pi)//ft
+S=p2/s3//gpm/sq ft
+A=p2/(r1*r)//sq ft
+//RESULTS
+printf('the capacity of the components of a rapid sand filtration plant=% f sq ft',A)