#Well drawdown wiki code#
#Well drawdown wiki free#

Versions Cover image from McDonald & Harbaugh (1983), which illustrates a computer surrounded by modules and arrays used by MODFLOW. Horizontal anisotropy for an entire layer can be represented by the coefficient 'TRPY' (Data Item 3 ). This tensor does not allow non- orthogonal anisotropies, as could be expected from flow in fractures. The principal components of anisotropy of the hydraulic conductivity used in MODFLOW is displayed on the right.The governing partial differential equation for a confined aquifer used in MODFLOW is: Tests become more definitive because they become less prone to being influenced unknowingly by other numerical and programming differences. This results because other aspects of the program remain the same. Models like MODFLOW make this kind of testing more definitive and controlled. Such testing is an important part of multi-modeling, or alternative hypothesis testing. This allows differences of opinion about how system processes function to be tested. Importantly, the modularity of MODFLOW makes it possible for different Packages to be written that are intended to address the same simulation goal in different ways. Indeed, this kind of innovation is exactly what was anticipated when MODFLOW was designed. If a programmer wants to change something in MODFLOW, the clean organization makes it easy. For example, capabilities (called 'packages') that simulate subsidence or lakes or streams, can easily be turned on and off and the execution time and storage requirements of those packages go away entirely. This means it has many of the attributes of what came to be called object-oriented programming. MODFLOW was constructed in what was in 1980's called a modular design. There are several actively developed commercial and non-commercial graphical user interfaces for MODFLOW.

#Well drawdown wiki code#

Since its original development in the early 1980s, the USGS has made six major releases, and is now considered to be the de facto standard code for aquifer simulation.

#Well drawdown wiki free#

The source code is free public domain software, written primarily in Fortran, and can compile and run on Microsoft Windows or Unix-like operating systems. The program is used by hydrogeologists to simulate the flow of groundwater through aquifers. Geological Survey modular finite-difference flow model, which is a computer code that solves the groundwater flow equation. ( Learn how and when to remove this template message) ( December 2021) ( Learn how and when to remove this template message) Please improve this article by removing excessive or inappropriate external links, and converting useful links where appropriate into footnote references. This article's use of external links may not follow Wikipedia's policies or guidelines.