Wasser fließt ins Kanalnetz

sewer system

Bevor Abwasser in der Kläranlage gereinigt werden kann, muss es gesammelt und transportiert werden. Dies geschieht über ein weit verzweigtes Kanalnetz mit Nebensammlern, Hauptsammlern und Pumpwerken. Für die Regenwasserbehandlung sind zusätzliche Anlagen im Kanalnetz vorhanden.  Rund 102.500 Einwohner aus dem Stadtgebiet sowie aus Ergolding, Altdorf, Furth (Ortsteil Arth) und Kumhausen sind an das Landshuter Kanalnetz angeschlossen.

It counts for kilometers about as much as the distance from Landshut to Bolzano: around 370 kilometers of sewer pipes are located under the urban roads and paths. The largest part are so-called mixed water channels (206 km). In them, the dirt and rain water runs to the sewage treatment plant in Landshut-Dirnau, where it is purified and returned to the natural cycle via the Isar River.

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The other part of the network consists of separate dirt and rainwater channels, the so-called separation system. Rainwater drains here to relieve the rest of the drainage system in separate channels - in the case of the district Achdorf, for example, these open in the Rossbach or in the northern Wolfgangiedlung the rainwater is introduced via infiltration from the earth's surface directly into deeper soil layers. Therefore, residents in the areas with separation system must pay special attention to ensure that no harmful substances come into the rainwater channel. Otherwise they will get into the natural waters without being cleaned up and disturb the ecological balance.

By the way, car washing is generally prohibited in Landshut on public roads.

Unangenehme Gerüche

Causes of odors from the canal

Unfortunately unpleasant odors in the channel can not be avoided. But sometimes it comes to massive odor nuisance outside the channel. This may be due to the fact that the water consumption is continuously decreasing, which also causes less sewage to flow in the sewers. Due to the low flow rate, sludge settles faster and the decay processes lead to odor nuisance. This process is exacerbated by high temperatures and longer droughts in summer.

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As a rule, there is sufficient air circulation in the sewer system that prevents toxic or foul-smelling gases from concentrating in one place. This natural air circulation may be disturbed by unfavorable structural conditions in the sewage system but also due to weather conditions.

Occasionally it also leads to unauthorized discharges into the sewer system, which favor the formation of foul-smelling gases. Another cause is channel blockages.

What countermeasures are taken by public utilities?

The sewer system of the city of Landshut is regularly cleaned by Stadtwerke Landshut with special vehicles. At the points of the sewer system where regular flushing is not enough, we install odor traps, artificial ventilation, filter systems or seal the drainage cover odor-tight. In addition, we monitor the discharges into our sewer system and regularly take wastewater samples, which we analyze in our sewage treatment laboratory.

If there are massive odor problems from the sewer over a longer period of time, please contact the Wastewater Department of Stadtwerke - by phone at 0871 1436 2503 or by e-mail abwasserbeseitigung@stadtwerke-landshut.de.

sewer cleaning

The public sewer system of Landshut with a total length of more than 370 km must be cleaned regularly. Otherwise it can lead to deposits and as a result to unpleasant smells and blockages. It thus ensures the dewatering comfort of the inhabitants, but also contributes significantly to the value retention of the sewer network.

Frequently Asked Questions (FAQ) & Info

How is the channel cleaning performed?

For sewer cleaning, a sewer cleaning vehicle from Stadtwerke Landshut or a contracted contractor is used. The removal of the deposits takes place with a cleaning nozzle on a long hose. Due to the water, which flows out of the nozzle at high pressure, the wall of the sewer pipe is effectively cleaned. At the next manhole, the dissolved deposits are extracted with a suction hose.

Impairments after a canal flush?

The sewage system is a reliable, proven and approved process, which normally runs unnoticed by local residents. However, the purge vehicle's engine and pumps need to run during the purge, and there may be bottlenecks in narrow streets due to the size of the vehicle.

The flushing process creates an overpressure or underpressure in the public canal. If this can not be compensated for in the site drainage system, it may very rarely be the case that there is leakage of water in the area of drains, especially in toilets. If the water of the trap (siphon) is sucked out completely or partially under negative pressure, an unpleasant odor from the channel over the sanitary objects can freely enter the apartment.

Eliminate odor problems after a channel flush?

Run water into the basins or flush the toilets to close the siphon again. If your property drainage system is properly installed, the pressure will be equalized through the ventilation openings of your inspection shaft and via the duct ventilation above the roof. If the ventilation of your property drainage system is impaired, improperly planned or carried out, or does not exist at all, water may escape from the odor locks of the toilets or drains.

If you experience these problems, we recommend having your property drainage system inspected by a specialist company for the ventilation device and making the necessary changes.

Reinigung des öffentlichen Kanalnetzes