$10\mathrm{.}6\mathrm{.}12$ Water flows over a sharp$-$crested triangular weir with $=90.$

The head range covered is $0\mathrm{.}20H1\mathrm{.}0ft,$ and the accuracy in the

measurement of the head, $H,$ is $H=+-0\mathrm{.}01ft.$ Plot a graph of the per$-$

cent error expected in $Q$ as a function of $H.$ Solve this problem please.