Lobau groundwater works

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Lobau groundwater works

The Lobau groundwater works in the Lower Lobau in Vienna was built between 1964 and 1966 and is used to cover consumption peaks in the drinking water supply. The Lobau waterworks is able to deliver 80,000 cubic meters of drinking water per day.

prehistory

The increasing water consumption of the City of Vienna (1935: 95 million cubic meters, 1965: 170 million cubic meters) forced those responsible to take various measures to ensure that the population of Vienna was supplied with drinking water . Additional sources were captured and fed into the pipeline network and new tanks were built.

The realization of the planned construction of the 3rd Viennese aqueduct was delayed again and again, so that the Viennese waterworks examined the groundwater areas in the city for their quality and productivity. However, the results were not satisfactory, so that the area of ​​the Lower Lobau - surrounded by the Danube , Danube-Oder Canal and the Vienna city limits - was examined as a last resort . This approximately 1,200 hectare area was declared a water protection area at the request of the waterworks in 1960 .

Investigations

In order to determine the amount of water available, its quality and the expected long-term productivity, pumping tests were necessary over a period of several months. The City of Vienna received the necessary permit in February 1961.

In 1963, after repeated pumping attempts while observing the water quality, the geological and hydrological conditions and their changes, the decisive water law negotiation took place in December.

Particular attention had to be paid to the Lobau oil port and the central tank farm, which were heavily bombed during the Second World War , which led to heavy contamination of the subsoil with oil.

The oil processing industry demanded that the city project be rejected, but the Supreme Water Authority rejected this request as legally and factually unfounded.

construction

Information board

The municipal council issued the building permit on March 20, 1964, and the construction site was set up on April 6 of the same year.

A water tank with a capacity of 30,000 cubic meters, a lift and an operating building were built. In order to be able to connect the Lobau groundwater works with the three horizontal filter wells (Groß Rohrwörth, Alter Kreuzgrund and Gänshaufen) to the pipeline network, a pipeline with a total length of 12,140 meters was built (diameter 1,000 and 1,200 millimeters) through which the water approximately 3.25 Hours reached the city's pipe network. The Gänshaufen fountain is the furthest away from the elevator at almost four kilometers.

The construction work was delayed by a prolonged flood in the spring and summer of 1965. The resulting extremely high groundwater level filled the trunks of the supply lines (loss of time about seven months) and the construction pits for the water tank and the lift (loss of time about two months).

A total of six different official procedures were necessary for the construction of the plant:

  • Water law procedure: The water law procedure included the pumping tests, the protected area and the container.
  • Building authority procedure: The building authority procedure included, among other things, the construction of the wells, the valve chamber as well as the containers, the lifting gear and the operating building.
  • Electricity law procedure: The electricity law procedure comprised the construction of a 20 kV line approximately 15 kilometers long, which was necessary to operate the Lobau groundwater works.
  • Telecommunications law procedure: The telecommunications law procedure included the construction of a private telecommunications system.
  • Legal proceedings under railway law: The legal proceedings under railway law comprised the crossing of the pipeline, which connects the groundwater works with the urban pipe network, with the Eastern Railway at the underpass of Kaisermühlenstrasse in the 22nd district of Vienna on Mühlengrund.
  • Mining law proceedings: The mining law proceedings concerned crossings of oil and gas pipelines.

Horizontal filter well

The three horizontal filter wells have a shaft diameter of four meters and a depth of 11.9 to 13.5 meters. At a depth of 8.4 to 11.5 meters, 12 horizontal filter tubes between 288 and 309.6 meters were driven in a star shape. The cost of such a well was about 2.5 million shillings, (about 182,000 euros).

Installation

The Lobau groundwater works was officially put into operation on June 3, 1966 in the presence of Hubert Pfoch , the City Councilor responsible for public facilities , the Mayor of Vienna Bruno Marek and the Federal President Franz Jonas and other guests of honor.

Contaminated central tank farm in Lobau (oil port)

Since the bombing of the Lobau central tank farm and the Lobau oil port, both the soil and the groundwater have been contaminated with oil. In October 2002, work began to prevent contamination of the groundwater in the area of ​​the Lobau groundwater works (including the construction of barrage wells ). From 2003 to 2009, however, the site was finally secured by erecting a cut-off wall in the upstream and by creating a row of barrier wells and a barrier element in the downstream.

Web links

Individual evidence

  1. ^ Federal President Jonas handed over the groundwater works "Untere Lobau" to the company Rathauskorrespondenz from June 3, 1966

Coordinates: 48 ° 9 ′ 43 ″  N , 16 ° 31 ′ 34 ″  E