Question

what do you mean by drinage​

Answer 1

$\huge\mathfrak\purple{Hello\:Mate}$❤

Drainage refers to the river system of an area.

Hope it helps uhh✌✌✌

Answer 2

When rain falls on an area of land, the water travels downhill and typically collects into a lake or travels on through a river. ... In a catchment area water can be collected through rain or drained by rivers or streams.