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+
+
+//example 16.2
+//design a trapezoidal concrete lined channel
+clc;funcprot(0);
+//given
+Q=100;               //discharge
+S=25/100000;           //bed slope
+N=0.016;             //rogsity coefficient
+s=1.5;               //side slope
+r=8;                 //b/d ratio
+
+//using manning equation V=(R^2/3*S^1/2)/N;
+//Perimeter=A/R 
+//V=Q/A and on simplification we get
+d=((101/10.09)*(12.18/10.09)^(2/3))^(3/8);
+b=r*d;
+b=round(b);
+d=round(d*100)/100;
+mprintf("required bed width=%f m.",b);
+mprintf("\nrequired bed depth=%f m",d);
+