Predicting collector well yields with MODFLOW

Ground Water
Vic Kelson

Abstract

Groundwater flow models are commonly used to design new wells and wellfields. As the spatial scale of the problem is large and much local-scale detail is not needed, modelers often utilize two-dimensional (2D) or quasi three-dimensional models based on the Dupuit-Forchheimer assumption. Dupuit models offer a robust set of tools for simulating regional groundwater flow including interactions with surface waters, the potential for well interference, and varying aquifer properties and recharge rates. However, given an assumed operating water level or drawdown at a well screen, Dupuit models systematically overpredict well yields. For design purposes, this discrepancy is unacceptable, and a method for predicting accurate well yields is needed. While published methods exist for vertical wells, little guidance is available for predicting yields in horizontal screens or collector wells. In plan view, a horizontal screen has a linear geometry, and will likely extend over several neighboring cells that may not align with rows or columns in a numerical model. Furthermore, the model must account for the effects of converging three-dimensional (3D) flow to the well screens and hydraulic interference among the well screens; these all depend...Continue Reading

References

Nov 16, 2001·Ground Water·H HaitjemaW de Lange
Mar 25, 2010·Ground Water·Henk HaitjemaDaniel Abrams
Aug 23, 2011·Ground Water·Rhett MooreVern Rash

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Citations

Jul 12, 2013·BioMed Research International·Antonio PeñaMartha Calahorra

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