A model for solving transient groundwater flow in confined, unconfined and leaky aquifers.

About CVM10

CVM10 is a cartesian and radial finite element groundwater flow model.  It simulates groundwater flow in confined, unconfined and leaky aquifers, under steady-state and transient conditions.

CVM10 has two main components: an extremely quick finite element solver built using FORTRAN, and a front end user interface built in Microsoft Excel. This combination makes running models and displaying results quick and easy in CVM10.

There are two versions of CVM10: CVM10-LITE (available to download for free now) and CVM10-PRO (available to purchase later this year). 

See feature comparison.

All CVM

Pumping Test Simulation

CVM-LITE is ideal for simulating the monitoring results from a pumping test, where parameters of Transmissivity, Storage Coefficient, Leakage Coefficient and Head Boundary Conditions can be adjusted to best match the observed drawdown and measured pumping rate.

CVM10-LITE can simulate Theis confined aquifer conditions and Hantush leaky aquifer conditions, and can simulate radial flow to a well under either constant pumping rate or constant drawdown conditions.

Below: Modelling a constant head pump test in CVM10-Lite. The profiles show the change in groundwater head with time in the aquifer. The initial water level in the aquifer is set at 10m and the head in the well is kept constant at 5m.

 

Head vs distance chart

Recharge Simulation

Distributed recharge to the aquifer (i.e. rainfall) can be modelled as a constant recharge rate, or a variable leakage rate with recharge proportional to the drawdown from an initial uniform head.

The example below shows how a confined aquifer is modelled under constant recharge conditions when the boundary conditions at both ends are known.

CVM10-Lite can model rainfall to an aquifer. as distributed recharge.

Key features

Click the tabs below to explore in further detail the features of CVM10.

Built In Manual

CVM10 contains a built-in manual. This manual is accessed by pressing the purple About or ? buttons in the CVM Flow Input Worksheet.

CVM10 Groundwater Modelling Software - Groundwater Flow Equation

 

Geometry

CVM10 can run in either an Axisymmetric or Cartesian coordinate model system. It can also model confined and unconfined conditions.

Mesh

CVM10 is a one-dimensional finite element model. The mesh can be generated with one of four mesh generation techniques. The mesh can be generated to have either fixed or logarithmic spacing, or geometric increasing or decreasing element length. The mesh can contain up to 300 elements. 

Mesh generation in CVM10

Time Conditions

CVM10 can be run in both Steady State and Transient conditions. You can define the maximum time by deciding the number of time steps per log cycle.

 

Materials

In CVM10-LITE one material is set to all elements within the mesh. CVM10-PRO can model up to six materials within the modelled domain. With nodal input, you can linearly interpolate between the material properties. For example, you could model an unconfined aquifer with a sloping base.

 

Initial Conditions

In CVM10-LITE a uniform initial head condition can be set. In CVM10-PRO it is possible to read in a non-uniform initial head profile from a restart file (a previous CVM10-PRO run) or set a maximum of 9 non-uniform head values defined at specified nodes.

Boundary Conditions

In CVM10-LITE a maximum of 2 fixed head and 1 fixed flux boundary conditions can be set. The desired coordinate of the boundary condition is input, and the boundary condition is specified at the nearest node.

Observation Points

The calculated head vs time result can be viewed at a maximum of 10 observation coordinates. The observational coordinates are specified by the user, and the graph of head vs time will be plotted for each specified observation coordinate.

Time Step Profiles

The calculated head vs distance result can be viewed at a maximum of 9 times. The required times are specified by the user, and the results are plotted as head versus distance for each user specified time.

 

 

 

 

 

Feature Comparison

Features

COMPARE PACKAGE FEATURES

Max No. Elements

Max No Time Steps

Model Geometry

Aquifer Type

No. of Vertical Materials

Initial Head Conditions

Fixed Head Boundary Conditions

Fixed Flux Boundary Conditions

No. Observation Points

No. Time Step Profiles

FREE

Available to download now

300

101

Axisymmetric & Cartesian

Confined & Unconfined

1

Uniform Head

2

1

10

9

£TBC

available later in 2017

300

101

Axisymmetric & Cartesian

Confined & Unconfined

6

Uniform Head

Read in Non-Uniform Head from a Previous Analysis  

6

6

10

9

Download CVM10-LITE

To download CVM10-Lite, please fill in the form below. A download link will become available once submitted.

At this time CVM10 is only supported on Windows PCs (32-bit and 64-bit).

To install CVM10 the download package must be extracted to access the files. Windows 10 has a built in extractor. If you are running an earlier version of Windows then you may need to install some software such as 7zip or WinRar. 

There are installation instructions included within the download package which MUST be followed to set up CVM10 correctly.

Please bear in mind this is a beta version of the software. You may run into some difficulties/bugs when running the software. If you would like to report any issues or submit any feedback then please get in touch by emailing George French at george.french@ogi.co.uk.





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