Dear Afnan Ahmed,

Any FEM based software is Ok for designing of Earth fill dam. Anyway, I will suggest you to use GEO5 software. It is free. The web site is:  http://www.finesoftware.eu/geotechnical-software/

Hope, this will help.

For quick analysis, you can use Rock-science software "SLIDE" .  Which is limit equilibrium based software.

Any FDM or FEM based software can be used for designing such a dam, e.g. FLAC3D.

Thanks Md. Mahmud Sazzad, Amarnath Hegde and Wentao Feng for your answer. 

let me try it the FEM based software.

Dear Mr. Ahmad,

You can use MIKE software for your research work.

All the best

Dear Afnan

You can use Geo Studio Package and can perform slope and seepage analysis.

ARC GIS SOFTWARE

ABAQUS

Abaqus, Plaxis, or Geo Studio

i think Plaxis Finite Element punchmark

With the Flac software

Yes, what is the Flac software???

GeoStudio, SoilVision.

Dear Afnan,

If you are looking for a free or trial version, you could go for GeoStudio or Slide (from Rockscience), but if you want a more advanced software, you must go for a FEM of DEM software, such as Plaxis or Flac. Both of them are useful but the second is a little bit more complicated and I am not sure that them provide trial versions.

Any case, the trial versions have restrictions which could interfer, waste away or mislead your aproaches.

Best regards.

Geostudio is the easiest to learn and start with. There are many modules and they work in tandem for providing complete solution. Here is s link to help you. https://www.geo-slope.com/solutions/dams-and-levees

The clue is in the question: it says SMALL dams, so any basic seepage and slope stability software should be adequate, such as those already suggested, i.e. Geostudio.  You do not mention the dam abutments as an issue, but for most small dams there are not normally any major concerns.

GeoStudio

Thanks to all for your useful answers.

I have installed the Geostudio software and started work on slope stability, after that i will go toward seepage. 

Once again thanks.

GeoStudio is suitable.

I like Slide 7 of rocscience (Ewert Hoek).

Have a good job.

SlopeW

SeepW

Plaxis i think is suitable for that.

SLIDE

seep w  is better than plaxis

Thanks to all