There are so many groundwater modelling softwares out there. However, since you are interested in dewatering, I will suggest you employ Soil Water Charateristic Curve (SWCC) Modelling approach. There are lots of literature especially by Fredlund on these approach and the procedures.

Hi,

Have a look at Plaxis 3D. it is basically a Geo-technical finite element modelling software but has variety of options and applications available.

go to link: http://www.plaxis.nl/plaxis3d/demo/

and watch the video "Tunnels and underground structures".

Groundwater Modelling System ( GMS ) and ModFlow

Dear Farzad,

Visual MODFLOW® Flex is the industry standard software for 3D modelling flows of groundwater, transfer of heat and pollutants.

1. Construction of Conceptual Models and Digital Integrated flow of groundwater

2. Powerful 2D and 3D visualization capabilities

3. Intuitive and easy to use.

Visual MODFLOW Flex allows you to choose the modelling approach you want to use when building the flows of groundwater models. You can choose the approach conceptual models, highly efficient and extremely flexible, or the approach of conventional models.

 With Visual MODFLOW Flex, you have a complete set of tools that allow you to treat the water quality, groundwater flows, and initiatives concerning the protection of spring water, thanks to:

MODFLOW-2000, 2005, NWT - Standard modelling of groundwater flow

MODGLOW-LGR - Local mesh refinement (LGR) in shared node for simulations at the regional-local

SEAWAT v.4 - groundwater flow with variable density in 3D, associated with solute transport for several species and heat transfer

MT3DMS - Package Standard simulation of pollutant transport for several species

MODPATH - Standard Package modelling the particle path

Zone Budget - water balance calculation Package of different sub-areas

PHT3D - 3D modelling of reactive transport code of several components in saturated porous medium which combines the two existing computer programs most used, the solute transport modelling and geochemical PHREEQC MT3DMS-2 code of the USGS.

WinPEST - Automatic calibration and sensitivity analysis View all flow engines, transportation engines and MODFLOW packages.

With my best regards

Prof. Bachir ACHOUR

Also FEFLOW is a good software for flexibility of a finite-element mesh, direct coupling with solute - heat transport and fracture modelling. 

If not only mass but also heat flow is importand take a look on TOUGH2

And also other Modflow based programs, for example Processing Modflow, Groundwater Vistas, 

In general, I used Groundwater modeling System (GMS), it is comprehensive one 

All of them are good, but only one is a freeware - Processing Modflow in older version 5.3.

Thank you all for your attention and comprehensive answers.

Is there any chance that one of you dears has done dewatering research ?

There are many many software programmes out there from descent firms and companies. Depending on what is your real purpose on modeling. To my knowledge one of the best is Feflow, which I strongly recommend. If you are trying to predict the evolution of a pollution in groundwater and you got all data needed such as drilling boreholes details, strata and geological types, fluctuation of aquifer during some years at least etc etc, Feflow will do the best job. But remember before you start modeling you should  carefully calibrate your model before attempting applying. This procedure is vital and critical. Finally,do not expect a model to be 100% confident because all of them incorporate some errors in their methodology and approach. But Feflow has been tested in many cases and proved quite reliable and versatile....

I wish you a good choice 

Enclosed are the well-known solution method of groundwater flow and transport processes and on this basis developed software products:

1.  FDM/FVM based GW-software

http://www.novametrixgm.com/groundwater-software

2.  FEM based GW-software

www.mikepoweredbydhi.com/products/feflow

FEFLOW provides best-in-class technology for groundwater flow, contaminant, groundwater age and heat transport simulations. With its efficient user interface and its yet unmatched range of functionality and flexibility, FEFLOW has become a standard in premium groundwater modelling over the last 35 years.

3.  Analytic Element based GW-software

www.scisoftware.com/environmental_software/product_info.php?products_id=92

Alternative numerical method based upon the superposition of simple analytical solutions

Did you finish your research? we can work together...

MODFLOW, SEAWAT are two softwares that are used for groundwater modelling. I came across these softwares when I was reviewing a paper on Saline Water Intrusion@ FARZAD

GMS

I'm quite new to modeling and was trying many software for the same but, I find FEFLOW much easier because of its interface.

Catchment scale: Flopy (MODFLOW API) just because it is much more efficient when running a lot of models than through the boring and slow GUI.

M to mm scale: Hydrus (when not concerning multiphase flow) or regarding multiphase flow problems then FEFLOW, also easier to just run on a HPC instead of a VM.

The choice always depends on wanted accuracy and available time!