We consider the flow passing through a sluice gate $($figure Q$18).$ The depth at the

sluice gate is $0\mathrm{.}9m$ and the depth just downstream is $0\mathrm{.}5m.$ Compute the

discharge per unit width

a$)1\mathrm{.}09\frac{m^2}{s}$

b$)0\mathrm{.}318\frac{m^2}{s}$

c$)1\mathrm{.}68\frac{m^2}{s}$

d$)0\mathrm{.}93\frac{m^2}{s}$

e$)1\mathrm{.}22\frac{m^2}{s}$