Problem $3\mathrm{.}44$

The average velocity $(V)$ and depth of flow $(d)$ in a channel reach are measured, as

shown in the following table, during four storm events. The trapezoidal reach has a bot$-$

tom width of $15$ ft $,$ side slopes of $2\mathrm{.}5$:$1($h:v$),$ and a bottom slope of $0\mathrm{.}008.$ Mean velocity

measurements are assumed to be accurate to $+-10\%,$ and the depth has an expected

accuracy of $+-0\mathrm{.}3ft.$ What is the best estimate of $n$ and what is its expected accuracy?