Water Map for the Outer Boroughs

In 1874, a map like none other was unfurled before city planners by Col. Egbert Ludovicus Viele. Designed in a time when the city was rapidly expanding north thanks to advances in public transportation, Viele captured for posterity the locations of the island’s springs, brooks, creeks, and swamps, where land meets landfill, tracing former shorelines and hilltops. To this day, this map is used by structural engineers in Manhattan, who check it for buried streams when constructing buildings, tunnels and utility lines.

With 82 of the 101 hidden city streams in my book located outside of Manhattan, what map did I use to find these waterways?