Question $2.$ The following Table $1$ are the ordinate of general hydrograph of flow from a

catchment of $1333\mathrm{.}1k{m}^2$ due to $6$ hour rainfall.

a$)$ Derive $2-$hour unit hydrograph and plot the $2-$hour unit hydrograph

b$)$ Derive $4-$hour unit hydrograph and plot the $4-$hour unit hydrograph

using superposition method. Provide all plots for both superposition

method

c$)$ Derive $4-$hour unit hydrograph using S$-$curve method. Provide all plots

for S$-$curve method including the S$-$ curve ordinate and lagged S$-$

curve ordinate

d$)$ Derive $6-$hour unit hydrograph using S$-$curve method. Provide all plots

for S$-$curve method including the S$-$curve ordinate and lagged S$-$

curve ordinate

e$)$ Display $2-$hour, $4-$hour and $6-$hour unit hydrograph together with

including the $S-$ curve ordinate and lagged $S-$ curve ordinate together

Mark allocated:$20$