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+

+

+//example 5.13

+//calculate formation constant of acquifer using theis method

+clc;funcprot(0);

+//given

+Q=2500;      //discharge(l/min)

+r=60;        //distance of observation well from acquifer

+tmin=[1 1.5 2 2.5 3 4 5 6 8 10 12 14 18 24 30 40 50 60 80 100 120 150 180 210 240];  //time in minutes

+s=[0.2 0.26 0.3 0.33 0.36 0.41 0.45 0.48 0.53 0.56 0.59 0.62 0.66 0.71 0.75 0.80 0.83 0.86 0.91 0.95 0.98 1.03 1.05 1.08 1.10];  //drawdown

+u=[1:1:9];

+Wu=[0.2194 0.04891 0.01315 0.003779 0.001148 0.000360 0.000116 0.0000377 0.0000125];

+for i=1:25

+    tday(i)=tmin(i)/(60*24);

+end

+

+for i=1:25

+    rt(i)=r^2/tday(i);

+end

+//graph is plotted between s and r^2/t and W(u) and u and they are superimposed.

+//from which we get

+s1=0.52;

+Wu1=2.96;

+rt1=700000; u1=0.03;

+Q=3600;                //discharge in cumec/day

+T=Q*Wu1/(4*%pi*s1);

+S=4*u1*T/rt1;

+T=round(T);

+mprintf("formation constant of acquifer:");

+mprintf("\nT=%f cubic metre/day/m.\nS=%f.",T,S);