Many a visitor to Mendoza has stumbled into the drainage ditches that line miles of city streets- especially those who’ve been over-served the juice of the indigenous Malbec grape.  And it was the indigenous people who first dug those mini canals that funnel glacial runoff into what would otherwise be an arid high desert.  The vast tree canopy over Mendoza is possible only because of that irrigation.  Local orthopedic surgeons like ’em too.