Two box culverts each is $0\mathrm{.}61m$ by $0\mathrm{.}61m$ and has $n=0\mathrm{.}013,K_e=$

$0\mathrm{.}05,C_d=0\mathrm{.}85,L=30m,S_0=0\mathrm{.}7\%,$ and $HW=1\mathrm{.}5m.$ What is the

design flow capacity $(\frac{m^3}{s})$ for tailwater of $TW=1\mathrm{.}17m?$

Answer: