Axlrosen finds this tiem via the blog
Fogonazos - no I don't know what it means either, but it has highlighted this, the largest drain hole in the world.
This water passageway is the usual spill method for the Monticello Dam in Northern California.
It blows out its hole with great might.
More pics at the blog entry linked to above. They link to
this site which explains it in some detail. Apparently the engineering term for this type of spillway is 'morning glory spillway', and they use the term 'glory hole' for this particular one. I decided not to attract Google links by using the term as the subject for today's item.