People lined up outside hospitals, looking through photographs of the dead pasted on walls; families wading through mud and debris in search of their possessions; a woman carrying a child past damaged buildings; and a dead dog lying amid the wreckage.

These are some of the stark images that have come to define the aftermath of Nepal’s devastating flashfloods. With each passing day, relatives of those missing lose a little more hope, even as rescuers battle difficult conditions in the search for survivors. Nepal is struggling to find its footing after a torrent of water, mud and debris swept through towns and villages on Wednesday, washing away homes, vehicles, roads, bridges and damaging hydropower projects, causing heavy casualties. The death toll crossed 650 on Saturday, while more than 2,400 people remained missing, as rescue teams raced against time amid intermittent rainfall in the flood-affected regions.

Outside hospitals, families could be seen lining up to chec...