Groundwater Modeling Software
AnAqSim (analytic aquifer simulator) is a groundwater modeling tool that can cover a range of needs from the simplest 2D capture zone simulation to moderately complex 3D and transient simulations. It employs the analytic element method (AEM) in a unique way that allows fully transient modeling, multi-level aquifer systems, and anisotropy.
Dr. Charlie Fitts, author of AnAqSim and the textbook Groundwater Science, 2nd ed., has over 35 years experience with groundwater and geotechnical consulting, and is available for consulting on groundwater modeling projects.
3-D Dewatering Example Model Posted
Many users are solving transient construction and mining dewatering problems with AnAqSim, so we have created an example model to show how to create such models. This model is of a construction dewatering system that includes a partially-penetrating sheet pile barrier, three partially-penetrating wells within the barrier, and a recharge trench outside the barrier where well discharge is injected back into the aquifer. The model has 7 layers in the system area and is transient with two phases of pumping. See the model and its results and download the model files.
AnAqSim (analytic aquifer simulator)
Gain more insight in less time
A quick alternative to MODFLOW and other numerical methods for modeling cases that range from simple to moderately complex.
AnAqSim is the most versatile and capable analytic element method software: multi-layer 3D systems, full transient capabilities, heterogeneity, anisotropy, fresh-salt interface aquifers, and a full suite of line boundary types.
AnAqSim has been used to simulate groundwater remediation designs, mine and construction dewatering, infiltration mounding, regional aquifer flow, capture zones, well field impacts, fresh/salt interface flow in coastal aquifers, pathlines, advective transport, and embankment seepage.
Video overview of AnAqSim:
What AnAqSim users have to say
We recently purchased two AnAqSim licenses and have had a lot of success with it. We have since built a good portfolio of multi-layer models that have been successfully simulated with AnAqSim and benchmarked against other software. We are starting to use it a lot.Stephen Thomas
AnAqSim is an easy to use, powerful, and cost effective AEM software that keeps getting better with every new release. I have used it successfully on a number of consulting projects including wellfield permitting, remediation design, site characterization, saltwater intrusion studies, and mine hydrology investigations, and it has worked well for all my applications. Whenever I have questions or need help with AnAqSim, Fitts Geosolutions always responds quickly and thoroughly. I would recommend AnAqSim to any groundwater flow modeler, beginner or expert.Katie Feiner
I use AnAqSim for estimating the potential impact of 1) leaky wells in multi-layer aquifer settings linked with calibration constrained uncertainty analysis (via PEST); 2) rapid impacts assessment of quarry/mines. The prompt and helpful support offered by the software developer has made understanding the principles behind the AEM method relatively easy to grasp. I would recommend AnAqSim to anyone who requires a rapid groundwater impact assessment method.Mark Hocking
I am new to AnAqSim but have already learnt some useful tips and tricks which I can apply to other modelling applications such as Modflow. The developer quickly replies to my queries and provides lengthy explanations when needed. I purchased the flexAEM tutorials with the AnAqSim software and have found these to be extremely helpful in learning how to properly set up my models. I have successfully used AnAqSim to approximate stream depletion solutions for Jenkins (1968), Hantush (1965) and Hunt (1999) type settings.Simon Harper