TimML

A multi-aquifer, analytic element model

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.

Downloads

TimML can only be run if you also install Python, and the numpy and scipy packages. The current release of TimML is for Python 2.4.X (make sure you get the packages specifically for Python 2.4). Download options for these free products are given below. Detailed installation instructions are also given in the TimML manual.

The TimML installer, manual and code can be downloaded from www.code.google.com/p/timml.

TimML Installation Questions

The only common problem with installation (and running) seems to be the error message: "Could not find DFORRT.DLL". If you don't have this dll on your machine, click here, and save the dll at an appropriate spot on your machine, for example c:\winnt\system32 or c:\windows\system32.

Funding for TimML development

• Ecosystems Research Division, Office of Research and Development, United States Environmental Protection Agency, Athens, Georgia, USA. Project manager: Steve Kraemer.
• Wittman Hydro Planning Associates, Inc., Bloomington, Indiana, USA. Project manager: Vic Kelson.
• Amsterdam Water Supply, Brabant Water, and WBL, in collaboration with Artesia.

Development

TimML was devoped by Mark Bakker. For questions, bug reports, or if you want to contribute to TimML, contact: Mark Bakker