# 2004 Milan
In sparsely populated areas a central drinking water supply is not economical. This describes exactly the situation in the mountains. Here, existing sources can be used to supply the people who live in this area. A supply system consist out of pressure pipes, several shafts and storage tanks. The complete system has to be tight, fast to install, easy to operate and must have a long service life. The elements of water supply system are presented. These are usually collecting shafts and storage tanks. The production, the installation and the operation will be described. The basis for all buildings is the structural double wall HD-PE pipe. It has a relative low weight, high ring stiffness and relative low cost. The presented structural double wall HD-PE pipe is made with an solid inner liner, a rectangular reinforcing profile and a final external layer. It can be designed in order to withstand the internal stresses and the external loads. Combined with the characteristics of the material it is ideal for building the collecting shaft and water reservoirs. It is shown, that for the fabrication of storage tanks and collecting shafts the structural double wall pipes are a vary attractive option regarding the costs and safety during the installation and use.