Selected nutrients in stormwater runoff from Davenport, Iowa, 1992

Water-Resources Investigations Report 94-4130
Prepared in cooperation with the City of Davenport, Iowa
By:  and 



Flow-weighted composite samples of stormwater runoff from areas of different land use in Davenport, Iowa, were collected in the summer and fall of 1992 and analyzed for selected nutrients. Annual constituent loads were estimated for the area drained by the Davenport storm-sewer network. In all cases, the regression-equation estimate of mean annual load is less than the estimate obtained by using the method of the U.S. Environmental Protection Agency. The largest mean annual loads for total nitrite nitrogen, total nitrate nitrogen, total nitrite and nitrate nitrogen, total organic nitrogen, total ammonia and organic nitrogen, total nitrogen, and total phosphorus are associated with residential land, which covers 67.2 percent of the area drained.

Using concentration data from this study, it is estimated that an average storm-producing runoff during the 7-day, 10-year low-flow discharge of the Mississippi River would contribute about 4 percent of the total ammonia and organic nitrogen load in the river. Precipitation-chemistry data indicate that substantial parts of the nitrate nitrogen and ammonia nitrogen contained in the stormwater runoff could be from precipitation.

Study Area

Additional publication details

Publication type Report
Publication Subtype USGS Numbered Series
Title Selected nutrients in stormwater runoff from Davenport, Iowa, 1992
Series title Water-Resources Investigations Report
Series number 94-4130
DOI 10.3133/wri944130
Year Published 1994
Language English
Publisher U.S. Geological Survey
Publisher location Iowa City, IA
Contributing office(s) Iowa Water Science Center
Description iv, 29 p.: ill., maps; 28 cm.
Country United States
State Iowa
City Davenport
Online Only (Y/N) N
Additional Online Files (Y/N) N
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