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Fact Sheet 196-99

Fact Sheet 196-99

U.S. Geological Survey combined well-bore flow and depth-dependent water sampler

By Izbicki, J.A., Christensen, A.H., Hanson, R.T., Martin, Peter, Crawford, S.M., Smith, G.A.


The U.S. Geological Survey has developed a combined well-bore flow and depth-dependent sample collection tool. It is suitable for use in existing production wells having limited access and clearances as small as 1 inch. The combination of well-bore flow and depth-dependent water-quality data is especially effective in assessing changes in aquifer properties and water quality with depth. These are direct measures of changes in well yield and ground-water quality with depth under actual operating conditions. Combinations of other geophysical tools capable of making these measurements, such as vertical-axis current meters used with wire-line samplers, are commercially available but these tools are large and can not easily enter existing production wells.

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Send questions or comments about this report to the first author, Julia A. Huff, (619) 225-6123.

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