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:
Pumping Test Example Model
AnAqSim is a great tool for doing more sophisticated pumping test analysis, where partial penetration, layering, irregular boundary conditions and other factors make the usual radial solutions like Theis inappropriate. An example analysis from a consulting project is presented that shows how AnAqSim can be used in this way. The pumped well and three observation wells are partially penetrating in a thick, stratified alluvial aquifer. See the model writeup and download the model files.
Interview with AnAqSim’s Author
Recently, Charlie Fitts, author of AnAqSim, was interviewed about the analytic element method, what inspired him to write AnAqSim, how AnAqSim differs from other AEM programs, and some other related topics. Here is a link to the interview.
AnAqSim In Depth Webinar Series Feb 23 – Mar 30, 2021
We are running the popular 6-session series again in spring 2021. The webinar series covers all key aspects of AnAqSim and helps you become a power user. There is one one-hour session per week for 6 weeks. Each session has segments of presentation, software demonstration, and Q&A, plus optional home exercises. Learn AnAqSim, which is quick, easy to use, and far more capable than other analytic element programs. Details here.
Use PEST with AnAqSim
Several AnAqSim users are using PEST (parameter estimation software) to automate calibration and optimization of AnAqSim models. AnAqSim’s command line mode and text outputs allow you to solve a wide range of parameter optimzation problems such as
- find aquifer parameters and recharge rates that best fit observed heads and discharges,
- find optimal well locations and discharges that will capture contaminant plumes with a minimum of discharge, and
- find optimal well discharges through time to meet dewatering criteria.
3-D Dewatering Example Model
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.
Join the Ranks of AnAqSim Users (below is a small sample of them)
Calif. Dept. of Toxic Subst. Control
Pontificia Universidad Javeriana
So. Florida Water Mgmt. District
University of New South Wales
University of Western Australia
Woodard and Curran
WSP Parsons Brinckerhoff