Year: 2011
Type: erratum
Abstract: Haitjema et al. 2010. Modeling Flow into Horizontal Wells in a Dupuit-Forchheimer Model. Ground Water 48(6): 878–883. In our paper “Modeling flow into horizontal wells in a Dupuit-Forchheimer model”, by Haitjema et al. (2010) we miscalculated the resistance cls for the radial collector well in the section “Comparison with a 3D Solution.” Instead of using the radius of the lateral (0.15 m) we inadvertently used the diameter (0.3 m), which resulted in too low a resistance value. The true value is 0.004203 days instead of the reported 0.003443823 days. As a result the well discharge in our approximate solution becomes 56,775.13 m3/day, which is 5% lower than the 3D solution. The well discharge appears very sensitive to the assumed head along the lateral. When replacing the head of 20.82 m in the 3D solution of Bakker et al. (2005) by the head of 20.74 m resulting from their quasi-three dimensional solution the error reduces to 3%. While not “nearly exact” as originally reported, the approximate solution is still satisfactory from a practical point of view. In the last sentence of the “Concluding Remarks” we write: “Vertical anisotropy in the aquifer may also be included by replacing the hydraulic conductivity and the aquifer thickness by scaled values as outlined in most textbooks.” This is true, but we might have clarified that the elevation of the lateral must also be scaled (like the aquifer height), while, for best results, the radius of the lateral should not be scaled.
Source: Ground Water
Language: English
Subfield: Environmental Engineering
Field: Environmental Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W4232428218