Water flows in a $1\mathrm{.}9-$m$-$diameter finished concrete pipe so that it is completely full and the pressure is constant all along the pipe. If the

slope is $S_0=0\mathrm{.}0084,($a$)$ determine the flowrate by using open$-$channel flow methods. Compare this result with $($b$)$ that obtained using

the pipe flow methods of Chapter $8($Use Colebrook formula, Table $8\mathrm{.}1,$ Table $10\mathrm{.}1$ and assume that $Re>{10}^6).$

$($a$)Q=$

$\frac{m^3}{s}$

$($b$)Q=$

$\frac{m^3}{s}$