I recognise this spot from my cycling jaunts along the country roads around Pollenca and PP. In fact, SWSetc...(!), this stream/river passes just behind the Hotel Llenaire that you recently photographed. At this point it's called the Torrent de la Vall Marc. If you look at Google Earth you can see the river course and the abundant green growth along its path so I guess it delivers enough water to keep those trees growing! However, further BACK,'upstream', it's fed by the Torrent de Sant Jordi, which we know in summer is totally dry. Therefore, I guess there must be some spring that 'sprouts a leak', as it were, as there's always a fair bit of water even in the hot months of July/August. Mind you, what do I know. I'm no David Attenborough!