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Time of travel and dispersion in a selected reach of Roberts Creek, Clayton County, Iowa

Water-Resources Investigations Report 91-4145

Prepared in cooperation with the Iowa Department of Natural Resources, Geological Survey Bureau
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Abstract

Time of travel and dispersion were determined in a 9.4-river-mile reach of Roberts Creek in northwestern Clayton County, Iowa, in the spring of 1990. Time of travel was determined so that a discrete parcel of water could be sampled through the study area during medium to low streamflow conditions. Dispersion characteristics were determined to identify solute-transport differences under two streamflow conditions.

Time of travel was determined by dye tracing, using rhodamine WT as the tracer. One dyeinjection site and three sampling sites were used to measure time of travel. Two dye-tracing tests were conducted at discharges having flow-duration values of 48 and 80 percent. The discharges at the time of the two dye-tracing tests approximated medium- and low-flow conditions. The average stream velocity in the study area was 0.23 foot per second during medium-flow conditions, March 20 to 22,1990, and 0.07 foot per second during low-flow conditions, April 30 to May 12, 1990. The injected dye dispersed in a plume that lasted about 18 hours during medium flow and about 64 hours during low flow at the downstream site.

Study Area

Additional publication details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Time of travel and dispersion in a selected reach of Roberts Creek, Clayton County, Iowa
Series title:
Water-Resources Investigations Report
Series number:
91-4145
Year Published:
1992
Language:
English
Publisher:
U.S. Geological Survey
Publisher location:
Reston, VA
Contributing office(s):
Iowa Water Science Center
Description:
iv, 16 p.: ill.; 28 cm.
Country:
United States
State:
Iowa
County:
Clayton County
Online Only (Y/N):
N
Additional Online Files (Y/N):
N