Characterization of High-K Pathways by Borehole Flowmeter and Tracer Tests |
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Authors: | Steven C Young |
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Institution: | Waterloo Centre for Groundwater Research, University of Waterloo, Waterloo, Ontario, Canada N2L 5Y9. (Currently employed by Environmental Consulting Engineers, Knoxville, Tennessee 37933.) |
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Abstract: | This paper reviews different borehole flowmeter analysis methods and evaluates their applicability to a test site composed of fluvial deposits. Results from tracer and aquifer tests indicate that the aquifer is highly heterogeneous and that low-K skin effects exist at the wells. Borehole flowmeter tests were performed at 37 wells. An appropriate method for calculating borehole flowmeter K values was developed based on results from multiwell pumping tests, single-well pumping tests, and slug tests. The flowmeter data produced 881 K values. The trends and the magnitude of the K values are consistent with results from geologic investigations, recirculating tracer tests, and large-scale multiwell pumping tests. The field tests illustrate that high-K deposits can significantly affect ground-water flows in some heterogeneous fluvial aquifers. |
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