II$.$ Unit$-$Hydrograph $($de$-$convolution and application$)(20\backslash \%)$

According to a historical event, a storm had three successive $6-$hr interval of rainfall magnitude of $\backslash (3\mathrm{.}0,5\mathrm{.}0\backslash ),$ and $4\mathrm{.}0$ cm $,$ respectively. Assuming $\backslash (\backslash$emptyset $\backslash )-$index of $\backslash (0\mathrm{.}20\backslash$mathrm$\{$~cm$\}/\backslash$mathrm$\{$hr$\}\backslash ).$ In the outlet of this watershed, we find the observed streamflow is as following table,

$($a$)$ From your observation, which part of the streamflow hydrograph is the baseflow, and which part is the direct runoff?

$($b$)$ Please determine the $6-$hr unit hydrograph.

$($c$)$ Please estimate the area of this watershed.

$($d$)$ Now we have a rainfall forecast as following,

Please determine the flood hydrograph for this coming storm. $($Note: I guess you need using S$-$curve to determine the $3-$hr unit hydrograph, rather than using the $6-$hr unit hydrograph directly. Can you also tell me why?$)$

$($e$)$ If you are the person in charge, and informed that the levee capacity in the outlet of watershed is $400$ cms $.$ When will you issue a mandatory evacuation order to ask residents "they" to evacuate? Tell me your reason$/$consideration$/$concern$.($Note: You may have to estimate the time for evacuation according to the area of watershed.$)$