$V-$notch weir:

$=90$

Plot and Calculations:

Plot of $log(Q)$ vs$.log(H)$ for rectangular weir and

determine the slope and Intercept of the plot.

Plot $Q$ vs $H^{\frac{5}{2}}$ and use it find $C_d$ for the $V-$notch weir.

Plot a graph of $-$axis$)$ against $-$axis$)$ for the

rectangular weir

Use a linear function to plot the best fit and express the relationship between $Q$ and $H^n$ and

in the form of: $Q=m{H}^n,$ in which the exponent value $n$ is $1\mathrm{.}5$ for the rectangular weir and

$2\mathrm{.}5$ for the triangular weir.

Calculate the coefficients of discharge Cd $($theoretical method$)$ using equations:

$C_d=\frac{m}{\frac{2}{3}\sqrt[\phantom{2}]{2g}b},C_d=\frac{m}{\frac{8}{15}\sqrt[\phantom{2}]{2g}tan\frac{}{2}}$

Record C $C_d$ values calculated from the theoretical method in the Result Tables.

Compare the experimental results to the theory by calculating the percentage of error.