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+
+
+//example 4.67
+//calculate return period of flood of 9950 cumec/s
+clc;funcprot(0);
+//given
+xavg=4200;      //mean
+sigma=1705;     //standard deviation
+xt=9550;        //flood value
+K=(xt-xavg)/sigma;
+yt=1.2825*K+0.577;
+l=%e^(%e^(-yt));
+T=l/(l-1);
+T=round(T*100)/100;
+mprintf("Return period of flood of 9950 cumec/s=%f years.",T);
+