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Bias in groundwater samples caused by wellbore flow

Journal of Hydraulic Engineering

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Abstract

Proper design of physical installations and sampling procedures for groundwater monitoring networks is critical for the detection and analysis of possible contaminants. Monitoring networks associated with known contaminant sources sometimes include an array of monitoring wells with long well screens. The purpose of this paper is: (a) to report the results of a numerical experiment indicating that significant borehole flow can occur within long well screens installed in homogeneous aquifers with very small head differences in the aquifer (less than 0.01 feet between the top and bottom of the screen); (b) to demonstrate that contaminant monitoring wells with long screens may completely fail to fulfill their purpose in many groundwater environments.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Bias in groundwater samples caused by wellbore flow
Series title:
Journal of Hydraulic Engineering
Volume
115
Issue:
2
Year Published:
1989
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Hydraulic Engineering
First page:
270
Last page:
276
Number of Pages:
7