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Evaluation of flowmeter-head loss effects in the flowmeter test

Publication ,  Journal Article
Ruud, NC; Kabala, ZJ; Molz, FJ
Published in: Journal of Hydrology
October 12, 1999

In this study, we develop an axisymmetric groundwater flow model to numerically simulate the hydraulic head loss across the flowmeter during a flowmeter test. Using it, we investigate the influence of flowmeter induced hydraulic head losses and filter pack effects on the calculated drawdown distributions in the vicinity of the pumping well and on the flowmeter test estimates of layer horizontal hydraulic conductivity, K(i), in three different aquifer-well systems: A homogeneous aquifer; a homogeneous aquifer with a filter pack surrounding the well; and a two-layer aquifer with a filter pack surrounding the well. We confirm that the K(i) estimates can be significantly biased due to the head loss across the flowmeter. This head loss induces a non-uniform flow pattern in the vicinity of the well, which violates the horizontal flow assumption invoked by flowmeter test interpretation methodologies. The effect of the hydraulic head losses alone (i,e. no cross-flow through the filter pack) can lead to K(i) estimation errors as great as a factor of three even in a homogeneous aquifer. The coupled effect of hydraulic head losses and cross-flow through the filter pack can lead to K(i) estimation errors of up to a factor of 10 or greater. In actual flowmeter tests, these head losses can be reduced by increasing the annulus of the flowmeter, by operating the flowmeter without a packer, or by choosing a small enough pumping rate.

Duke Scholars

Published In

Journal of Hydrology

DOI

ISSN

0022-1694

Publication Date

October 12, 1999

Volume

224

Issue

1-2

Start / End Page

55 / 63

Related Subject Headings

  • Environmental Engineering
 

Citation

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Ruud, N. C., Kabala, Z. J., & Molz, F. J. (1999). Evaluation of flowmeter-head loss effects in the flowmeter test. Journal of Hydrology, 224(1–2), 55–63. https://doi.org/10.1016/S0022-1694(99)00119-5
Ruud, N. C., Z. J. Kabala, and F. J. Molz. “Evaluation of flowmeter-head loss effects in the flowmeter test.” Journal of Hydrology 224, no. 1–2 (October 12, 1999): 55–63. https://doi.org/10.1016/S0022-1694(99)00119-5.
Ruud NC, Kabala ZJ, Molz FJ. Evaluation of flowmeter-head loss effects in the flowmeter test. Journal of Hydrology. 1999 Oct 12;224(1–2):55–63.
Ruud, N. C., et al. “Evaluation of flowmeter-head loss effects in the flowmeter test.” Journal of Hydrology, vol. 224, no. 1–2, Oct. 1999, pp. 55–63. Scopus, doi:10.1016/S0022-1694(99)00119-5.
Ruud NC, Kabala ZJ, Molz FJ. Evaluation of flowmeter-head loss effects in the flowmeter test. Journal of Hydrology. 1999 Oct 12;224(1–2):55–63.
Journal cover image

Published In

Journal of Hydrology

DOI

ISSN

0022-1694

Publication Date

October 12, 1999

Volume

224

Issue

1-2

Start / End Page

55 / 63

Related Subject Headings

  • Environmental Engineering