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| Minnesota Water Science Center |
U.S. Geological Survey Scientific Investigations Report 2007–5138
By Allan D. Arntson
ONLINE ONLY
This report is available below as a 12-page PDF for viewing and printing.
Report covers 4 and 1 and report covers 2 and 3 (each is 11" by 17" tabloid) also are available for viewing and printing.
A time-of-travel study involving a luminescent dye was done on the Crow River in Minnesota from Rockford to the confluence with the Mississippi River at Dayton on July 11, 2006, at a streamflow of 293 cubic feet per second at Rockford. Dye was injected in the Crow River at Rockford, and traveltime and concentrations were measured at three sampling locations downstream: at the Hanover historic bridge in Hanover, at County Road 116 near St. Michael, and at County Road 12 in Dayton. The results of the measured traveltimes were compared to estimated traveltimes from a previous study of the Crow River and six other rivers in the Upper Mississippi River basin in 2003. Regression equations based on watershed characteristics of drainage area, river slope, mean-annual streamflow, and instantaneous streamflow at the time of measurement from more than 900 stream segments across the Nation were used to estimate traveltimes. Traveltimes were estimated and measured for the leading edge, peak concentration, and trailing edge of tracer-response curves. Estimated traveltimes for the leading edge, peak concentration, and trailing edge at Dayton were 25.3, 28.4, and 35.6 hours, respectively. Measured traveltimes for the leading edge, peak concentration, and trailing edge at Dayton were 33.2, 38.2, and 49.2 hours, respectively, for the 22.4-mile reach. Although traveltimes for the Crow and the Sauk Rivers were underestimated by use of the regression equations, the regression estimates were close enough to measured values to be considered satisfactory; hence, this estimating technique should be applicable in other source-water planning efforts in and near the study area.
ContentsAbstract Introduction Purpose and Scope Previous Studies Hydrologic Setting Methods Estimates of Traveltimes from Equations Time-of-Travel Study Estimated Traveltimes of the Crow River Measured Traveltimes from the Crow River Time-of-Travel Study Comparisons Between the Crow and Sauk Time-of-Travel Studies Implications Summary Acknowledgments References Cited |
| 1. Map showing location of seven watersheds tributary to the Upper Mississippi River. | |
| 2. Map showing downstream reach of Crow River showing selected locations of estimated and measured traveltime points. | |
| 3. Definition sketch for tracer-response curves. | |
| 4. Diagram showing lateral mixing and longitudinal dispersion of concentration
of a water-soluble tracer downstream from a single, center, slug injection. |
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| 5. Graph showing tracer-response curves for three Crow River locations. |
| 1. Estimated and measured traveltimes for reaches in the Crow River. | |
| 2. Watershed and dye-study characteristics for the Crow and Sauk Rivers time-of-travel studies. |
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Printable tabloid covers 4 and 1 (1.02 MB) - 1 page (11" by 17" paper)
Printable tabloid covers 2 and 3 (14.42 KB) - 1 page (11" by 17" paper)
Whole report (1.77 MB) - 12 pages (8.5" by 11" paper)
Suggested Citation:
Arntson, Allan D., 2007, Estimated and measured traveltime for the Crow River Watershed, Minnesota: U.S. Geological Survey Scientific Investigations Report 2007–5138, 12 p.
For more information about USGS activities in Minnesota, visit the USGS Minnesota Water Science Center home page.
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