Nitrate in the Mississippi River and Its Tributaries, 1980?2010: An Update

Nitrate concentration and flux were estimated from 1980 through 2010 at eight sites in the Mississippi River Basin as part of the National Water-Quality Assessment (NAWQA) Program of the U.S. Geological Survey (USGS). These estimates extend the results from a previous investigation that provided nitrate estimates from 1980 through 2008 at the same sites. From 1980 through 2010, annual flow-normalized (FN) nitrate concentration and flux in the Iowa and Illinois Rivers decreased by 11 to 15 percent. These two rivers had the high- est FN nitrate concentration in 1980 (5.3 milligrams per liter [mg/L] and 3.9 mg/L, respectively) of any of the study sites.

• | Author: Robert M. Hirsch
• | Publisher: Createspace Independent Publishing Platform
• | Publication Date: Jul 16, 2014
• | Number of Pages: 38 pages
• | Binding: Paperback or Softback
• | ISBN-10: 1500553107
• | ISBN-13: 9781500553104