Donovan's Journal is a book found in Dishonored.
[Excerpt from a worn journal]
Everyone was looking for someone to blame for what happened, as the waters rose day by day, and one by one the business owners had to give up their shops to ankle-high muck and river krusts started growing as far back as Thresh Street.
Truth is it wasn't some plot to wipe the ever-prosperous Rudshore off Dunwall's maps: it was laziness and stupidity. The barriers keeping the rising river waters out hadn't been maintained in at least a decade, and once one leak started the whole thing gave out. City was so tied up fighting the plague no one lifted a finger to salvage the place.
It's been a year now, and living in a place the Regent's forgotten about has its perks.
This note can be found in an abandoned apartment in the Rudshore Waterfront, on the corner of Agroosh Way and Ebenazar Causeway during the mission, The Flooded District.