Simulate. Predict. Optimize. The essential groundwater tool.

Anaqsim is the leading analytic element method for simulating groundwater flow. Perfect for quick analysis of simple to moderately complex problems

Used By / Whos using Anaqsim

Trusted by industryleading hydrogeologists, geologists, environmental scientists and engineers.

Key Features / 3 reasons to use Anaqsim

Empowering Precision in Water Modelling.

Gain more insight in less time

A quick alternative to finite element or finite-difference based models for modelling cases ranging from simple to moderately complex.

Fully transient with flexible layering

Ability to model spatially varying and transient boundary conditions in a flexible layering environment, allowing increased detail in areas of interest, whilst keeping the far-field simple

Feature rich with Anisotropy and fresh/salt water interfaces

An analytical model for solving not just theoretical textbook problems, but real-life messy problems

Use Cases / Where Anaqsim works

Since 2011, Anaqsim has been used on a range of groundwater projects projects of varying complexity.

Mine & Construction dewatering

Enables rapid testing of design concepts for dewatering strategies, costs optimisations, mitigation design testing and potential risk identification.

Regional aquifer flow

Allows quick development of conceptual models that can be tested against real-world data.

Well field impacts

Quickly simulate the impacts of well(s) location(s) to understand and address the potential impacts of wellfields.

Contaminant remediation

Quickly adjust your model to incorporate new 3D subsurface information for better understanding of even the most challenging in-situ groundwater remediation systems.

Infiltration mounding

Anaqsim becomes your most valuable tool in planning groundwater recharge and storage programs.

Capture zones

Simulate the movement of groundwater and assess the extent of the capture zone for informed decision-making.

Water injection

Manage model uncertainty with rapid prototyping of the system design in aquifer storage and recovery (ASR) projects.

Pricing / How much Anaqsim costs

Get started for free.

Download Anaqsim for free and dive into the world of fluid simulations. Upgrade to the paid version for advanced features, unlocking limitless possibilities for complex water modelling scenarios.




Ideal for personal or academic use on simple problems

Not for commercial use.



Per activation, yearly

Our full modelling solution, Ideal for commercial use and personal use for more complex problems

B Corp


Do you work for a B Corp or other impact focussed business? Get in touch to access your discount.



Are you an academic solving more complex problems? Get in touch to access your discount.

System Requirements

System Requirements for Windows:

  • Operating System: Windows 10 (64-bit)
  • RAM: 1GB although 8GB+ helps with larger problems
  • Storage: 500MB
  • Internet Connection: Required for software activation and updates
  • Additional Requirements: Microsoft .NET Framework 4.8 or later

Unfortunately there is currently no support for MacOS or Linux.

Version History

  • Release 2021-2 (27 Oct 2021)
    • The Surfer grid file export feature under the Plot File menu has been improved so the file imports as a text grid import file (*.grd) to Surfer without any modification needed.
    • In cases where the head drops below the base of an unconfined domain, the stored grid value is set to the base elevation.  This improves the appearance of exported grids when used in Surfer or other surface visualization tools.
    • Increased the marker size in plots of calibration target heads vs. modeled heads to improve plot appearance.
    • Fixed bug in automated run output of gridded data in transient models.
    • Fixed bug in multi-segment line pathlines, so pathlines starting from all segments of the polyline are drawn.
    • Fixed bug in Analysis/Check Boundary Condition at Latest Iteration, which had prevented display of this feature in the prior release.
  • Release 2021-1 (27 July 2021)
    • The unlicensed free version of Anaqsim is now much more capable, allowing up to 2000 equations, 3 levels, 2 time periods, and 5 steps per time period. The free version is now called unlicensed Anaqsim instead of AnaqsimEDU, since it is so capable and useful. For many users, the unlicensed version may be all they need. In prior releases, the free AnaqsimEDU version allowed 500 equations and 2 levels.
    • The unlicensed and licensed versions of Anaqsim are the same software – they only differ depending on whether there is a valid activated license or not. The unlicensed version limits the complexity of models at the solve step only. For all other features (making plots, analysis menu items, etc.), the unlicensed and licensed versions have the same capabilities. If you have a saved solution, you can make plots and analyze any model with the unlicensed, free version.
    • Added the option to specify the confined domain storage parameter as specific storage in addition to storativity. Specific storage is a more fundamental storage parameter independent of saturated thickness.
    • You can now export the data that is contoured in a plot in a format readily imported into the popular Surfer plotting program.
    • Added calibration targets for the discharges of internal head-specified and river line boundaries. These can be for single line boundaries or the total of multiple line boundaries. This is good for comparing stream gage data to modeled discharges of line boundaries representing those stream reaches. It is also useful for summing dewatering system discharges if the system uses sumps and trenches.
    • Added calibration targets for the discharges of head-specified wells. These can be for single wells or the total of multiple wells. This is useful for summing well dewatering system discharges.
    • Changed Sy and porosity (n) so they must be positive but can be 1.0 or more. This can be useful for modeling average travel times with adsorption and retardation (use R*n in place of n). Setting Sy=1 can be useful for modeling storage in ponds that are simulated as high-K unconfined domains.
    • Made it so calibration head difference labels are selected with drop-down lists, rather than having to type them in.
    • Forced the x axis lower limit to zero in time and distance plots when the starting x value is known to be zero.
    • Fixed a bug that made the check of SVAS boundary conditions appear wrong in certain circumstances despite a correct transient solve.
    • Fixed a bug in the scaling of v, and q vectors in nonlinear (not confined) domains.
    • Fixed a bug that left off last column of contoured data at the right edge of a plot.
    • Updated the math library component to the current version. They dropped support for 32-bit, so Anaqsim is now only 64-bit.
    • Updated the CAD drawing component to the current version.
  • Release 2020-1 (5 Feb 2020)
    • Changed licensing to a new system where you purchase a fixed number of 1-year activations that can be used on one computer or many computers, as desired. There is no time limit for when activations can occur, but each activation lasts for 1 year. This replaces the old purchase/license scheme which had a fixed number of computers and a fixed duration (1-, 2-, or 3-years). The new system is more flexible and automated, so a user can independently activate licenses with an activation key code sent to them right after purchase. Release 2020-1 honors licenses under the old system (purchases prior to February 2020) and under the new system (Feb 2020 and later).
    • Transient model initial heads are now specified by level and x,y instead of by domain and x,y. This allows greater flexibility and difference in the domain arrangements between the initial condition model vs. the transient model.
    • Line pathlines can now propagate from equally spaced points on each segment of a polyline instead of from points on just a single line segment.
    • Added an analysis tool to compute the discharge across all external line boundaries and report these to the run log. In a transient run these are reported for each time step. This capability is also now available in automated runs from the command prompt.
    • Updated Microsoft .NET from version 4.5 to version 4.6.
    • Fixed bug that placed pathline end point markers at 0,0 when no other end point was drawn
    • Fixed bug in pathline tracing when a particle leaves vertically
    • Fixed bug where in autorun mode, the plot points evaluated was always default (10000) instead of what was set in the .anaq file
    • Fixed bug that prevented graphic editing of area pathline polygons
Demo VersionLicensed Version
(inc B Corp and Academic)
Model layersUp to 3Up to 15
Time periodsUp to 2Unlimited
Time steps per periodUp to 5Up to 20
EquationsUp to 200040,000+
Activation & setup supportNoYes
Getting Started / Available Anaqsim resources

Everything you need to get going today.


Pumping Test

Dewatering Example


#Tutorial 1 Single layer modelling

Tutorial #1 steady, single layer

#Tutorial 2 Multi-layer modelling

Tutorial #2 steady multilayer

#Tutorial 3 Multi-layer modelling with 2 time periods

Tutorial #3 transient multilayer


  • Multi-Layer Models: Up to 15 levels, with layering scheme able to vary across the model
  • Transient Flow: Fully transient modelling using finite difference time steps and spatially-variable area sinks to model storage fluxes.
  • Aquifer Heterogeneity and Anisotropy: Confined, unconfined, and hybrid confined/unconfined domains.  Anisotropy can vary from one domain to the next
  • Full range of boundary elements: Wells – including multi domain wells, Lines – including rivers, fractures, drains and leaky barriers, Area Sink/Sources, including spatially variable sinks
  • Map-view plots: These include model elements, head contours, vectors, pathlines, and ability to annotate outputs.
  • Vertical profiles: These include head levels, domain boundaries, 3D pathlines, vertical leakage, and transient evolution thereof.


Our water modelling software has been extensively tested to ensure its accuracy and reliability. If you would like more information about the specific tests conducted, please see this page. If you have any questions, please get in touch and our team will be delighted to provide you with the comprehensive information you seek.

Get in touch.