clc
//initialisation of variables
Q1=30//cfs
Q2=16//cfs
a=32//sq ft
r=1.6//ft
i=10^-4//ft
n=1.25*10^-2//ft
h2=0.50//ft
c=3.33//ft
h1=5.20//ft
l=72//ft
s=12320//ft
//CALCULATIONS
L=s-l//ft
//RESULTS
printf('the forchheimer s methos =% f ft',L)