New groundwater well of the Rankweil water cooperative

In spring 2020, the Rankweil water cooperative, Vorarlberg, built a new groundwater well. An almost two kilometer long pipeline was laid for the water transport. Here, the new cement-coated pipes from Tiroler Rohre GmbH with a nominal width of DN 300 were used. The decision for the products from the heart of the Alps due to the fact that the entire Rankweiler distribution and transport network consists of ductile iron pipes. They also appreciate the constant further development of the pipes from Tirol, such as the ZMU-Austria pipe. The reason for the development of additional water resources is the increasing demand for water. The new “Im Schlatt” groundwater well was built in the alluvial forest on the lower Ill on land owned by the Altenstadt agricultural community. The transport pipeline leads from the well to the existing pipeline network. The laying in a dam between two ponds can be named as a particular challenge. Specially insulated pipes from TRM were used to keep the drinking water at a constant temperature. This is necessary because the water in the lake is heated up to 24 degrees Celsius even in the depths in summer. The pipes were laid using the so-called open-close process by two construction teams. Thanks to the VRS-T connection system, the teams were able to lay up to 80 meters of pipe per day. The bedding was partially replaced in order to achieve the best possible environment. In addition, with a trench depth of a good 1.5 meters, care was taken to ensure a slight gradient in order to ensure an improved water flow. The newly built well has a delivery rate of 61 liters per second. In this way, the forecast consumption on days with intensive use is optimally met. It also offers security of supply should the existing water supply of the water cooperative with the Tillis fountain and the Hochwuhr water intake fail. In the course of the well construction, an operating building with two water chambers for oxygen enrichment and a dedicated transformer station were built next to the 15 meter deep borehole. The total costs for this project are around 3.3 million euros.

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