Abstract
Wells are the major hydraulic structures for groundwater abstraction from aquifers. They have different geometrical features such as the small or large diameter; full or partial penetration; circular or irregular cross-section, which affect the groundwater movement pattern and hence the amount of water that can be abstractable by pumping. Field works are explained as for the well vicinity subsurface geological composition feature qualitative interpretation and preliminary aquifer parameter appreciation. Especially, time–drawdown data plot visualization on different scales (natural, logarithmic or semilogarithmic) is explained for meaningful deductions for possibilities of aquifer material heterogeneity, anisotropy, structural geological features, fractures, impervious layer existence, and porous medium. Steady and unsteady groundwater flow formulations about radial flow types are derived on simple, logical, and rational reasoning leading to mathematical formulations that are helpful for the quantitative aquifer parameter estimations for confined and leaky aquifers. Innovative methodologies are presented, including partial type curve matching, slope method, dimensionless straight-line, and double aquifer tests. Aquifer parameters, temporal and spatial variations within the depression cone during an aquifer test are explained quantitatively by statistical techniques. Furthermore, fuzzy aquifer parameter classification approach is also explained with practical application. At different sections, relevant numerical examples are presented with numerical solutions.
Published Version
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