AnAqSim (Analytic Aquifer Simulator) is groundwater flow modeling software based on an analytic element  approach that  divides the modeled region into subdomains (Fitts, 2010).   Like other analytic element programs, AnAqSim a great tool for relatively simple groundwater flow models.  But AnAqSim goes well beyond earlier analytic element  programs like TWODAN (earlier Fitts Geosolutions software), with its broad range of problem-solving capabilities:

• Fully transient capabilities using finite-difference time steps
• Isotropic or anisotropic subdomains, with variable direction and ratio of anisotropy
• Multiple layers with spatially-variable vertical leakage between layers (3-D)
• Ability to transition from multi-layer modeling in the area of interest to fewer layers or a single layer in the far-field
• Confined and unconfined subdomains
• Confined interface and unconfined interface subdomains for coastal aquifers

AnAqSim is lets you model moderately complex aquifer systems, while keeping the advantages analytic methods have over numerical methods: minimal input, rapid model construction, high accuracy, and easy modification of the modeled region.

To learn more, read AnAqSim's specifications, see a gallery of screen shots, read the User Guide, or read journal articles about the methods employed in AnAqSim.  You may test the free educational version AnAqSimEDU, or request a trial 7-day license to check out the full version of AnAqSim.  See the download page.

Plot view in user interface

Head profiles vs. time in transient model of dewatering

Profile showing pathlines heads, layering.

Data view in the user interface

Fitts Geosolutions   Groundwater Software and Consulting