Some of Venice’s smaller canals have almost dried up due a prolonged spell of low tides, frustrating boat crews and bewildering tourists. The prolonged stretch of ebb tides is linked to a lingering high-pressure weather system over much of Italy, experts say. Since the canals essentially serve as streets in car-less Venice, the phenomenon of the last days has added to the challenges of everyday life in the lagoon city. Ambulance boats have had to tie up further from some destination, forcing medical crews to carry stretchers over long distances as their vessels cannot progress up canals reduced to a...