WELLS

WELLS is a C code simulating drawdowns caused by multiple pumping/inecting wells using analytical solutions.

WELLS can represent pumping in confined, unconfined, and leaky aquifers.

WELLS applies the principle of superposition to account for transients in the pumping regime and multiple sources (pumping wells).

WELLS can apply a temporal trend of water-level change to account for non-pumping influences (e.g. recharge trend).

WELLS can account early time behavior by using exponential functions (transmissivities and storativities; Harp and Vesselinov, 2010b).

WELLS analytical solutions include:

• confined aquifer (Theis, Mishra et al)
• unconfined aquifer (transformed Theis, Mishra & Neuman)
• leaky confined aquifer (Hantish, Mishra et al)
• leaky unconfined aquifer (Mishra et al)
• fully and partially penetrating pumping well(s)
• fully and partially penetrating observation well(s)
• transient pumping rates: step changes and linear changes (Mishra et al)

WELLS has been applied to decompose transient water-supply pumping influences in observed water levels at the LANL site (Harp and Vesselinov, 2010a). For example, the figure below shows simulated drawdowns caused by pumping of PM-2, PM-3, PM-4 and PM-5 on water levels observed at R-15.

Codes with similar capabilities are AquiferTest Pro, AquiferWin32, Aqtesolv, MLU, and WTAQ.

The source code, example input/output files, and a manual are available at WELLS website.

LA-CC-10-019, LA-CC-11-098