Pfettrach

BW

Template: Infobox River / Obsolete

The Pfettrach is a left tributary of the Isar River.

It rises north of Obersüßbach in the forest area Gschwandholz at an altitude of 480 m above sea level. NN. After 21 kilometers it flows northeast of Landshut Altstadt at an altitude of 385 m above sea level. NN in the Little River Isar.

The Pfettrach is the most important waters in the northeastern district of Landshut. Its catchment area covers about 167 km ². The most important tributary is the Further Bach.

Before and early 20th century the Pfettrach was also called Hirsch Auerbach.

Nature and Environment

The Pfettrach is notorious for its annual high water and flooding. Trigger this are often heavy rain, however, the largest water levels are usually in the spring when the snow melts recorded. In this case, the level increases fivefold (from 25 cm to 150 cm in January 2011, see References).

Bridges and adjacent cultivations are destroyed here regularly. The two existing in the village Pfettrach bridges in wood construction in 1934 replaced by a highly water-resistant concrete construction, which in 1982 again reinforced.

In Altdorf there to control since 2010, an air pressure -regulated rubber dam around the drain. It replaced the lock built in 1952. In addition, the bank has been restored to the adjoining land between Ganslberg and Altdorf- center, so that no more breaks its banks and floods in the creek. From Altdorf to Löschenbrand similar fortifications are to be created by 2020. The located just upstream of the weir Hirschenauer Bridge in Station Road ( with the same phases as the Pfettracher bridges) was 2011/2012 completely renovated to meet the expected increase in water level as well as to increased traffic requirements. The records of the water levels at the measuring point Löschenbrand ended 29 March 2012 and documented Hochwasserereingisse over 175 cm on 20 February 1999, over 150 cm on 13 January 2011 14 January, 2004 March 21, 2002 and March 21, 2000. On 25 August 2005, the 150 cm were just missed. The measuring point in Altdorf continues the records.

Until the mid-20th century, the Pfettrach was also used for the disposal of domestic waste water - by partially presdented small wastewater treatment plants. Meanwhile, the whole catchment is connected to a central sewer system, only occasionally there are in exposed locations Kleineinleiter, however, had to be renewed by the amendment of the Waste Water Charges Act 2006 to the disposal facilities. For drinking water supply ( e) does not serve the Pfettrach. The area has ample reason and deep water, the water supply meets the purpose association Pfettrach group. The water quality of Pfettrach is therefore generally classified as very good, which can be seen from the local fish species. Mention may be made, inter alia, Grayling, chub, brook and rainbow trout, stone loach, three-spined stickleback, Elrike, gudgeon, dace, arbor, roach and Schneider. Occasionally also attract eels from the River Isar her up. Reported sightings of the rare cancer are unconfirmed.

In addition, the catchment area of the stream provides habitat for rare species such as the kingfisher observable, the egret or the beaver.

Historical useful

The Pfettrach was used until the mid-20th century by Mühlwerken for timber and grain processing. Some street and place names such as Mühlkanalstraße, Haunmühle and Mühlbach testify. To this end - and also for flood control - the stream has been repeatedly postponed and provided with a channel running parallel. A tap of the channel now runs underground in the area of the sports ground in Pfettrach at the valley road (48 ° 34 ' 21 " N, 12 ° 4' 32 " O48.57250312.075428 ). Other remnants of the canal system still exist on the stretch between Arth and Aich at 48 ° 34 ' 56 " N, 12 ° 3' 50 " O48.5822112.06401.