Six $(6)$ rainfall stations are located in Catchment A$.$ The observed daily precipitation

and contribution area obtained from GIS analysis are shown in Table $1.$

Table $1$: Daily precipitation and contribution area

$($i$)$ Calculate the mean precipitation by using the Thiessen polygon method.

$[4$ Marks$]$

$($ii$)$ Compare the result obtained in $($i$)$ with mean precipitation by arithmetic mean

method.

$[4$ Marks$]$

Rainfall station RF$9132$ located in Sg Klang has recorded $10$ highest rainfall for $90$

minutes duration, as shown in Table $2.$ Construct the design rainfall temporal pattern

for Station $9132.$