TimML is a computer program for the modeling of steady-state multiaquifer flow with analytic elements and consists of a library of Python scripts and FORTRAN extensions. TimML may be applied to an arbitrary number of aquifers and leaky layers. The head, flow, and leakage between aquifers may be computed analytically at any point in the aquifer system. The design of TimML is object-oriented and has been kept simple and flexible. New analytic elements may be added to the code without making any changes in the existing part of the code. TimML is coded in Python, a free, open-source, powerful programming language; occasional use is made of FORTRAN extensions to improve performance. TimML is free and open-source software and is released under the GNU Lesser General Public License.
Download options include the TimML program and the manual. The manual contains full instructions on how to run TimML. The objective of the manual is to provide enough information for someone familiar with the analytic element method to use (and possibly modify) the program. More information on the analytic element method may be found in the books Groundwater Mechanics by O.D.L. Strack and Analytic Element Modeling of Groundwater Flow by H.M. Haitjema. Details about multi-aquifer modeling with analytic elements are provided in a series of papers, see Mark Bakker's publications Running TimML and especially modifying TimML requires some knowledge of Python. Python is very easy to learn. A number of free tutorials are available from the Python website.