Graupa Bach

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Graupa Bach
Data
Water code DE : 5371914
location Saxony ( Germany )
River system Elbe
Drain over Elbe  → North Sea
source Graupa , northeast of the location
51 ° 0 ′ 35 ″  N , 13 ° 55 ′ 34 ″  E
Source height 305.8  m above sea level NHN
muzzle Pillnitz , 150 m south of the Dampfschiffstrasse / Söbrigener Strasse junction Coordinates: 51 ° 0 ′ 19 ″  N , 13 ° 52 ′ 25 ″  E 51 ° 0 ′ 19 ″  N , 13 ° 52 ′ 25 ″  E
Mouth height approx.  110  m above sea level NHN
Height difference approx. 195.75 m
Bottom slope approx. 32 ‰
length 6.1 km
Catchment area 6.6 km²
Left tributaries Bach from Söbrigen
Right tributaries Deep Grundbach, cattle boat, Söbrigener Weinberggraben

The Graupaer Bach is a 6.1 km long right tributary of the Elbe with the main flow direction west. It rises east of the Borsberg and flows through the eponymous Graupa district of Pirna , as well as Oberpoyritz and Pillnitz in the south of the Dresden district of Loschwitz . Along the agriculturally used areas, the largely straightened brook is considered to be a conditionally natural body of water, but in the inner city it is built up in several places.

course

The Graupaer Bach and its tributaries arise in the natural area of ​​the Wachwitzer-Pillnitzer slopes (→  Dresden Elbe slopes ), which is characterized by a steep slope on granodioritic subsoil along the Lusatian thrust . The source lies east of the Borsberg in the slopes northeast of Graupa. From there, the brook flows along the Sauteichweg to the south-east, before heading west before the Graupa locality. Along the northern edge of the Graup settlement, the brook flows through a wide Mulde valley to the Borsbergbad outdoor pool . In this short section, the stream has already covered 155 meters in altitude, and it will be around 40 meters to the mouth.

The stream then flows through Großgraupa and on to Kleingraupa, where it passes the village square and shortly thereafter marks the border between Graupa and Oberpoyritz at around 100 meters, which is also the city boundary between Pirna (north) and Dresden (south). For comparison: the total length of the city limits of the Saxon state capital is 139.65 km. A few meters later, the Graupaer Bach takes on the Tiefen Grundbach, which flows through the Tiefen Grund , a valley that descends steeply in parts from Borsberg to Kleingraupa in the north and through which the shared city limits also run in sections.

Oberpoyritz on the Borsberghang, the course of the Söbrigener Weinberggraben can be seen in the foreground, while the Graupaer Bach flows behind the viewer.
At the former Oberpoyritz district fire brigade , the Graupaer Bach crosses under the village square (in the photo in front of the telephone booth )

The further course of the Graupaer Bach takes place in a straightened river bed in an agricultural area north of the Graupaer and the Lohmener Straße until it enters the Oberpoyritz center. The stream, which is now partly fortified with bank walls and partly built over, picks up the cattle messenger also coming from the north at the village square. After leaving the town center, the straightened stream flows again on a flat slope through agricultural areas and takes up the Söbrigener Weinberggraben, which is only a few hundred meters long. After passing the Schöpsdamm, the stream is a little more south than before.

From the crossing under Lohmener Straße ( Staatsstraße 167 ) in Pillnitz, the Graupaer Bach flows in a south-westerly direction. Shortly before its mouth, south of Söbrigener Straße, it takes on a westward flowing stream from Söbrigen on the left.

The river flows into the Elbe at the level of the Pillnitz Elbe Island a few meters before the landing stage for the Saxon steamship (White Fleet). Historical maps show that the estuary was located further west several centuries ago; the former estuary can no longer be identified.

Flood

Over 80% of the land use in the Dresden section is through fields / grassland and forest, whereas settlement and traffic areas only take up a small proportion. It is similar in the Pirna section.

The Graupaer Bach has only a low discharge, so that it does not seem to have any water in Graupa during the summer months. At the mouth of the Elbe it has an average natural low water of 0.02 m³ / s (= 20 liters per second), with annual floods the amount can swell up to twenty times and with ten-year floods it can even be 8.3 m³ / s. The steep upper course, straightening of the stream bed and the partial construction in settlement areas with only small culverts ensure, on the one hand, that the stream can swell quickly in heavy rain, and on the other hand, the flood can no longer run off solely in the stream bed, especially in local areas. Among other things, this led to damage to the village square in Kleingraupa as a result of the August flood in 2010 and to weeks of backwater in Pillnitz during the June flood in 2013 . In the long term, it is planned to disclose some piped sections to improve flood protection .

Protected areas

Part of the catchment area extends over the landscape protection area (LSG) d32 Elbe slopes Dresden-Pirna and Schönfelder Hochland , the estuary is in the extensive FFH area Elbe valley between Schöna and Mühlberg .

On the Oberpoyritz village square is the natural monument (ND) 85 stem oak Dorfplatz Oberpoyritz , parallel to the stream in front of Pillnitz are the oaks on Schöpsdamm (ND 52), nine stately old stem oaks . The 50 protected biotopes in the catchment area include orchards, dry and semi-arid lawns as well as lean fresh and mountain meadows.

supporting documents

  1. ↑ a b c d e f g h i j k l State capital Dresden, The Lord Mayor, Environment Agency (ed.): Graupaer Bach water profile . ( Online as PDF ; 2.4 MB - as of September 30, 2011).
  2. ↑ Location, area, area. State capital Dresden, accessed on December 16, 2016 .
  3. ↑ The deep reason. Heimatverein Graupa, accessed on December 16, 2016 .
  4. ↑ Reeds on the ravine. Heimatverein Graupa, accessed on December 16, 2016 .
  5. ↑ Dried up stream bed in autumn 2018. In: Mapillary. October 12, 2018, accessed November 2, 2018 .
  6. ^ Minutes of the 12th meeting of the Graupa local council (ORG). (PDF; 74 KB) November 2, 2010, accessed December 16, 2016 .
  7. ↑ Flood damage on the Graupaer Bach will be removed. State capital Dresden, August 1, 2016, accessed on February 1, 2017 (press release).
  8. ↑ Protected areas according to the Nature Conservation Act. (PDF; 331 kB) In: Umweltatlas 06/2014. Environmental Office of the City of Dresden, p. 6 , accessed on December 16, 2016 .