A rain gutter (also known as eavestrough, guttering or just gutter) is a narrow channel, or trough, forming the component of a roof system which collects and diverts rainwater shed by the roof. In many buildings, the purpose of this diversion is to prevent drips off the roof edges. These drips can cause structural damage over time to the walls or the foundation of a building. However, in others the purpose is also to harvest rainwater, for household or garden use.

You may check if the abovementioned suggestions fit in your text.

--------------------------------------------------
Note added at 16 mins (2007-05-13 03:40:55 GMT)
--------------------------------------------------

Transliteration:

Chatte(n) aur nalee/parnAlee/gart/parnAlA/moree/varshA kA gutter

Roof is chatt and process of eavestroughing means exit arrangements for the rain water