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//example 16.7
//calculate annual average rainfall
clc;funcprot(0);
//given
L=50; //spacing between drains
k=1D-5; //permeability coefficient
a=10;
b=10.3;
Q=4*k*(b^2-a^2)/L;
Pav=Q*24*3600*100*100/L;
mprintf("annual average rainfall=%i cm",Pav);
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