1992
DOI: 10.1144/gsl.qjeg.1992.025.02.08
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Level-determined groundwater sampling from open boreholes

Abstract: An important aspect of any detailed groundwater quality investigation is determining the vertical distribution of pollutants. This may best be achieved by using permanent sampling systems installed in dedicated boreholes. However, the availability of open boreholes in the UK, coupled with the relative expense of installing dedicated systems, has increased the value of methods for obtaining level-determined samples from such boreholes. This paper presents a qualitative appraisal of three such methods, based on … Show more

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Cited by 12 publications
(5 citation statements)
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“…The average concentration of fluorescein in the water entering the abstraction borehole from layer n , C n [M/L 3 ], can be calculated by considering the mass balance in the section of the borehole intersecting that layer (e.g., Bishop et al ). Assuming that there is complete and effectively instantaneous mixing of water in this zone, the mass balance equation can be written: QnCn=truei=1nQiCntruei=1n1QiCn1where Q i [L 3 /T] is the discharge from layer i to the abstraction borehole, and C ′ n [M/L 3 ] is the concentration sampled from the top of layer n .…”
Section: Data Processingmentioning
confidence: 99%
See 3 more Smart Citations
“…The average concentration of fluorescein in the water entering the abstraction borehole from layer n , C n [M/L 3 ], can be calculated by considering the mass balance in the section of the borehole intersecting that layer (e.g., Bishop et al ). Assuming that there is complete and effectively instantaneous mixing of water in this zone, the mass balance equation can be written: QnCn=truei=1nQiCntruei=1n1QiCn1where Q i [L 3 /T] is the discharge from layer i to the abstraction borehole, and C ′ n [M/L 3 ] is the concentration sampled from the top of layer n .…”
Section: Data Processingmentioning
confidence: 99%
“…The average concentration of fluorescein in the water entering the abstraction borehole from layer n, C n [M/L 3 ], can be calculated by considering the mass balance in the section of the borehole intersecting that layer (e.g., Bishop et al 1992). Assuming that there is complete and effectively instantaneous mixing of water in this zone, the mass balance equation can be written:…”
Section: Data Processing High Frequency Sampling-fluoresceinmentioning
confidence: 99%
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“…To control for the bias induced by ambient flow, depth-dependent sampling [ 35 , 47 , 48 , 49 ] or vertical monitoring well nests [ 28 , 34 , 50 , 51 ] have been employed in many studies. However, these methods are technically challenging and expensive.…”
Section: Introductionmentioning
confidence: 99%