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Published in: Hydrogeology Journal 7/2023

28-09-2023 | Technical Note

Computing natural recharge using the water-table fluctuation method: where to site an observation well

Authors: Jean-Christophe Maréchal, Pierre Perrochet, Yvan Caballero

Published in: Hydrogeology Journal | Issue 7/2023

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Abstract

Accurate evaluation of natural recharge is fundamental for the estimation of renewable groundwater resources and constitutes a key issue for water resources management. Among physical, chemical and numerical methods, the water-table fluctuation technique is simple and easy to use. The main question is where, with respect to the draining stream, to locate the monitoring well to effectively observe representative water level fluctuations. Storage and discharged volumes in an unconfined aquifer during the water-table fluctuation application are described with equations using the Dupuit-Forchheimer model. This leads to the determination of an optimal distance from the stream (0.4 times the length of the aquifer) for siting observation wells. Beyond this distance, the computed volumes stored in the aquifer are overestimated by up to 20%. Less than this distance, the stored volume is highly underestimated.

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Literature
go back to reference Lanini S, Caballero Y (2021) ESPERE: a tool for multimethod aquifer recharge estimation: what’s new with version 2? Groundwater 59:5–6CrossRef Lanini S, Caballero Y (2021) ESPERE: a tool for multimethod aquifer recharge estimation: what’s new with version 2? Groundwater 59:5–6CrossRef
go back to reference Scanlon BR (2011) Estimating groundwater recharge. Cambridge University Press, Cambridge Scanlon BR (2011) Estimating groundwater recharge. Cambridge University Press, Cambridge
Metadata
Title
Computing natural recharge using the water-table fluctuation method: where to site an observation well
Authors
Jean-Christophe Maréchal
Pierre Perrochet
Yvan Caballero
Publication date
28-09-2023
Publisher
Springer Berlin Heidelberg
Published in
Hydrogeology Journal / Issue 7/2023
Print ISSN: 1431-2174
Electronic ISSN: 1435-0157
DOI
https://doi.org/10.1007/s10040-023-02707-5

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