Europe about 40 years, this system is a very conventional building system has several advantages compared to that stated below. Sifonik rain drainage system, vacuum system is completely filled with work sağlanır.Konvansiyonel slope compared to the system and thus avoid the use of a lower diameter of pipes seems to be the most important difference. Sifonik rain drainage system pipes are provided with the principle of operation is completely filled. The horizontal line as a result of the calculations in the 0% slope and lower diameters are provided with the system's first fully filled with water. Fully filled with water and air in horizontal lines, vertical line passing through the water with barındırmayan environment creates a vacuum effect. With this vacuum and flow rate of water increases. According to the conventional system is completely filled with pipes, pipe diameter is reduced by half. Horizontal piping can be made without the inclination or even very long distances. Landing is much less than conventional numbers. Thanks to high-flow self-cleaning feature of the system vardır.Yatay line rate up to 10 times the length of the line of descent, where the cost is minimized. This ratio may be a maximum of 20.