|UN-GW (for DOS)
||Order No: FOS 80
The UN-GW software package consists of two parts: 1) data bases and utilities,
and 2) mathematical models. Part 1 includes programs for permeability
calculations and conversions, ground-water chemistry, pumping tests, well
hydraulics and construction, water level data base and hydrographs, well logs
and lithological cross-sections. Part 2 consists of models for transient flow
in a confined aquifer, in an unconfined aquifer, in a small oceanic island, and
in a two-layered aquifer system. Various options are available for graphic
post-processing of results. The programs in the package are:
- GW1:Permeability calculations and conversions: units conversions;
empirical formulas (Hazen, USBR, Slichter, Kozeny, Zamarin, Terzaghi); average values
in layered media (horizontal and vertical flow); permeameter tests (constant head,
falling head, no discharge); pumping tests (steady-
state); tables with look-up values for hydraulic conductivity and
- GW2:Ground-water chemistry: data base with input, editing and report
capabilities; Stiff diagram, Piper diagram, Wilcox diagram.
- GW3:Pumping tests: Jacob, Theis, Hantush, recovery, dug wells; interac
tive data entry, editing and reporting; screen graphics, printing and plotting.
- GW4:Well hydraulics and construction: well functions (Theis, Hantush-Jacob),
Bessel functions, error function; pump tests (step-drawdown with well
loss, orifice weir, flowing well discharge); well construction
(recommended well diameter, optimum screen length).
- GW5:Water level data base and hydrographs: data entry, editing, analys
is, display, printing, plotting; depth-altitude conversion.
- GW6:Well logs and lithological cross sections: drilling data base; dis
play, print and plot lithological cross-sections.
- GW7:Confined aquifer model - areal; finite difference method: 2D transient
flow in an isotropic confined aquifer; spatially varying transmissivity
and storage coefficient; time variable recharge in outcrop areas;
dynamic (time-varying) prescribed head boundaries; space and time
variable pumping; inflow/outflow across model boundaries; uniform type
steps; uniform spacing; output includes maps, contours, hydrographs,
and water balance.
- GW8:Unconfined aquifer model - areal; finite difference method: 2D steady-
state/transient flow in an unconfined aquifer; change between confined
and unconfined condition; spatially variable hydraulic conductivities
and storage coefficients; time and space dependent recharge, evaporation
from water table, constant head stage (streams, lakes), and discharge/
recharge wells; uniform type steps; uniform spacing; dynamic (time-
varying) prescribed head boundaries; inflow/outflow across model
boundaries; output includes maps, contours, hydrographs, and water
- GW9:Model of a small island - cross-section; finite difference: 2D steady-
state/transient flow in fresh water part of an isotropic unconfined
aquifer with stagnant salt water; change between confined and unconfined
condition; spatially variable hydraulic conductivities and storage
coefficients; time and space dependent recharge, constant head stage
(streams, lakes), and discharge/recharge wells; uniform type steps;
uniform spacing; space and/or time dependent Ghyben-Herzberg ratio for
salt/fresh water used to determine transmissivities; dynamic (time-
varying) prescribed head boundaries (fluctuating sea level); inflow/
outflow across model boundaries; output includes cross-sections,
hydrographs, and water balance.
- GW10:Analytical and graphical data analysis for two-layer aquifer system:
analyze, transform, display or print data used in or produced by the
modeling of a two-layer ground-water system, modeled by GW7, GW8, or
GW9; detect discrepancies in data files.
- GW11:Graphics: used by all previous programs to create contour maps showing
wells, boundaries, roads, streams, etc.
The program is distributed on a set of HD DOS-formatted diskettes
containing runtime versions of each program, and example data sets, and includes
installation instructions, user's manual and example problems.
- Intel 80i86 based computer
- 640 Kb conventional RAM
- DOS 2.11 or higher
- CGA, EGA, VGA (recommended), Hercules, AT&T/Olivetti SGA WYSE graphics
- hard drive with about 7 Mb free disk space to install program and example
- math coprocessor strongly recommended
- Microsoft compatible mouse for graphics
- Epson compatible printer optional
- HPGL accepting plotter optional
Authors: J.K. Karanjec and D. Braticevic (U.N. Dept. of Techn. Co-op. for