Watering the pitch at half-time?

[ChuckyB]

Watching the Real - Betis match...
They come back for a shot of the Bernebeu at half-time and two big sprinklers are running at each end of the pitch (inside the area). By the looks of it, this could be a live shot, or one on tape from just before the game.

Are they watering the pitch at half-time? Is there a reason they'd do that? I've never seen it before.