I also take your point on Saura's affiliation. Party loyalty is probably not really an accurate expression. What I was trying to say is that the left in Catalonia finds itself opposing an allied leftist government in Madrid because local concerns trump common ideology. "My True Religion Is Kindness" -- The Dalai Lama
Then, as ICV define themselves as ecosocialist it would not be surprising that they would clash with their Socialist allies over environmental issues, except that in this case they're proposing a diversion of water to Barcelona despite its environmental impact, because ICV is stronger in the urban areas than in the rural areas.
As you pointed out in your econoticiario #4, the PP is also using this as a wedge issue: the PSC has opposed the transfer of water from Tortosa (in Tarragona) to Valencia, but advocates a transfer from the Segre, which means that the PSC's opposition to the transfer to Valencia has less to do with protecting the Ebro than with keeping the water in Catalonia. It'd be nice if the battle were only against the right wingers, not half of the left on top of that — François in Paris