Illinois Water Supply Planning




Hydrologic drought:
     An extended period of below-normal precipitation that results in uncommonly low levels of streamflow, shallow groundwater, and/or reservoir storage. Hydrologic drought usually infers some adverse impact, or the threat thereof, to the availability of water for instream and/or offstream uses. For Illinois, a hydrologic drought is typically considered to represent infrequent conditions that may recur on average no more than once in roughly 8-10 years, and, like other types of drought, affects large regions within the State.

Choose Another Glossary Word

You can also Search the questions/terms. Term References    

WSP FAQ Home - Glossary - Search

Illinois State Water Survey

2204 Griffith Dr
Champaign, IL 61820-7463

Terms of use. Email the Web Administrator with questions or comments.

© 2018 University of Illinois Board of Trustees. All rights reserved.
For permissions information, contact the Illinois State Water Survey.
Site Map