The US Geological Survey's website hosts a wide range of hydrologic data products, including thematic map viewer options for the National Hydrography Data set; NHD Plus, and the Watershed Boundary Dataset (WBD): https://nhd.usgs.gov/data.html.
Jacqueline V. Nolan
Cartographer
Library of Congress
From: Maps-L: Map Librarians, etc. [mailto:[log in to unmask]] On Behalf Of Susan M Peschel
Sent: Friday, December 08, 2017 11:54 AM
To: [log in to unmask]
Subject: Surface drainage information for Georgia
We have a patron looking for a detailed hydrologic unit map for Forsyth County, GA (Cumming Quad) or something showing surface drainage for that particular area.
Any suggestions would be appreciated.
Susan Peschel
AGS Library