English Experts

[Adriano Japan]

A rain gutter (also known as eavestrough (especially in Canada), eaves channel guttering or simply as a gutter) is a narrow channel, or trough, forming the component of a roof system which collects and diverts rainwater shed by the roof.

[Flavia.lm]

what about "spout" ? é só a "entrada" da calha?

musica-infantil-a-dona-aranha-em-ingles-t8696.html

[Adriano Japan]

mmm... fui pesquisar por "rain spout" é parece que é mais a saída da calha, ou seja, a "bica" que mencionaram no post.

Por outro lado, não confundir com Waterspout (tromba d'água).
Abs!

[Henry Cunha]

We also use downspout for the portion of the system that carries water down to the ground. My little grandchild was singing this to me today:

The itsy-bitsy spider
Climbed up the water spout
Down came the rain
And washed the spider out
Out came the sun
And dried up all the rain
And the itsy-bitsy spider
Climbed up the spout again

http://www.youtube.com/watch?v=aGpnYl4OpXk