QUESTION $2[25$ MARKS$]$

Figure $1$ shows the schematic diagram of a River A that is located in the $150k{m}^2$ of catchment.

Every year, the catchment receives $2,713mm$ of rainfall with December's monthly rainfall

contributing for $40\%$ of the annual rainfall. Information on stage and discharge of this river are

tabulated in Table $1.$

$($a$)$ Identify the type of soil based on the Horton infiltration equation of $f_p=1\mathrm{.}05+$

$0\mathrm{.}2e^{-0\mathrm{.}5t}.$

$[4$ Marks$]$

$($b$)$ Construct the stage discharge equation for River A$.$

$[12$ Marks$]$

$($c$)$ Determine the condition of River A in December based on the schematic diagram in

Figure $1.$ Consider the river flow in November was $1550\frac{m^3}{s}.$

$[9$ Marks$]$

Table $1$