QUESTION $1$

$[19$ marks$]$

$1\mathrm{.}1$ Detailed geotechnical investigations should be carried out once the route has been staked out. Discuss the type of methods and procedures used to obtain field samples for the following geotechnical investigations.

$(6)$

$1\mathrm{.}2$ The choice of type and shape of culvert depends on the location and the conditions prevailing. Mention the $4($four$)$ types of culverts a designer can choose from.

$(4)$

$1\mathrm{.}3$ Drawand label the hydrological cycle

$(9)$