$!!!$Urgent Please!!! Problem $4$: Streamflow discharge for a river at a station for a year are given in Table below.

a$)$ Draw the flow duration curve

b$)$ What is the discharge in the fifty percent of the time?

c$)$ Draw the total discharge curve.

d$)$ Calculate the annual average discharge

d$)$ What should be the volume of a reservoir to be built on the stream to meet a need equal to the average flow of the stream throughout the year.

$(30$ points$)$

$\backslash$table$[[$Month$,$Oct.,Nov.,Dec.,Jan.,Feb.,Mar.,Apr.,May,Jun.,Jul.,Aug.,Sep.$],[Q_{av}(\frac{m^3}{s}),45,80,55,51,65,95,155,210,109,43,35,31]]$

Number of days in each month

$\backslash$table$[[$Month$,$Jan.,Feb.,Mar.,Apr.,May,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.$],[$Day$,31,28,31,30,31,30,31,31,30,31,30,31]]$