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//example 15.1
//design a channel by Kennedy theory using Garret's diagram
clc;funcprot(0);
//given
Q=7; //full supply discharge
N=0.0225; //rogosity coefficient
S=1/4444; //bed slope
m=1; //critical velocity ratio
s=1/2; //side slope
//Values of B and D are obtained by Garret's diagram fig. 15.3(b) and tabulated as below
B=[6 7 6.75]; //width of bed from Garret diagram
D=[1.5 1.35 1.38]; //depth of bed from Garret diagram
Vo=[0.72 0.673 0.685]; //from Garret diagram
mprintf("Bed width Depth Ratio of V/Vo: Remarks");
for i=1:3
A(i)=B(i)*D(i)+D(i)^2/2; //Area
V(i)=Q/A(i); //Velocity
r(i)=V(i)/Vo(i); //ratio V/Vo
r(i)=round(r(i)*1000)/1000;
if i==1 then
s='small';
else
if (i==2) then
s='more';
else
s='satisfactory';
end
end
mprintf("\n%f %f %f %s",B(i),D(i),r(i),s);
end
mprintf("\nHence, B=%f m; D=%f m.",B(3),D(3));
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