gvSIG Fonsagua is distributed as a zip file that contains gvSIG 1.1.2 portable and a set of applications, most of then developed by CartoLab, to design WatSan networks. How to install it:
In order to use gvSIG Fonsagua you need a predefined structure of information. You can use a dataset we have built to make your own tests of the application. This data is unreal and just for testing purposes. To use it unzip the data where you want and inside the application configure the path to it pressing the configure button.
The source code can be accessed from Join Up forge.
There are two manuals (in spanish) for the application, one for the tools designed to introduce field information in the application and another one for the tools to design water networks.