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//example 5.6
//calculate yield from well
clc;
//given
b=30; //thickness of acquifer
s=4; //drawdown
r=0.1; //well radius
k=36; //permeability coefficient
R=3000*s*(k/(24*3600))^0.5;
Q=2.72*b*k*s/(log10(R/r)*24*3.6);
Q=round(Q*10)/10;
mprintf("yield from well=%f lit/sec.",Q);
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