HOME
The Info List - Dreisam


--- Advertisement ---



The Dreisam
Dreisam
(Celtic: *tragisamā, "the very fast one"[1]) is a 29 km long river, and a tributary of the Elz in the German state of Baden-Württemberg. The waters of the Dreisam
Dreisam
feed the famous Freiburg Bächle
Freiburg Bächle
runnels.

Contents

1 Geography 2 Floods 3 Drainage basin and tributaries 4 Usage 5 References 6 Literature 7 External links

Geography[edit] The Dreisam
Dreisam
originates in the Dreisam
Dreisam
valley (Dreisamtal) which is located in the Southern Black Forest
Black Forest
(Südschwarzwald). The origin of the river can be found close to a bridge on the Landesstraße
Landesstraße
127 which leads from Kirchzarten
Kirchzarten
to Stegen. Here, two streams, the Rotbach and Wagensteinbach, meet to form the Dreisam
Dreisam
river. This confluence is located in the western part of the Southern Black Forest
Black Forest
Nature Park below the so-called Höllental, where the Rotchbach flows through, and the Wagensteigtal. From there on the Dreisam, which was canalized, flows towards the west and reaches Freiburg at the eastern end of Ebnet. Along the way the Dreisam
Dreisam
meets the Krummbach and Brugga, two streams originating south of the Dreisam, as well as the Eschbach stream which flows north of the Dreisam. The river leaves the Black Forest at the Freiburg soccer stadium called Schwarzwald-Stadion and continues flowing westwards. In the eastern part of the city, water is withdrawn from the river at Sandfang. It is used to supply the Gewerbekanal, an industrial canal, and the famous Freiburg Bächle with water. A division of the river into a northern and southern branch takes place in the historic city center. The majority of the southern branch flows back into the Dreisam
Dreisam
directly west of the Höllentalbahnbrücke bridge which is located in the Stühlinger district. The remaining water runs through the areas Eschholz and Bischofslinde towards the west and ultimately flows back into the Dreisam
Dreisam
near Lehen. The northern branch of the river runs often subterraneously through the northwestern historic center of the districts Beurbarung and Brühl and flows westwards of Gundelfingen into Schobbach. Schobbach then again leads into the Glotter
Glotter
at Nimburg-Bottingen. As a result, the Freiburger Bächlewasser flows into the Dreisam
Dreisam
only shortly before Riegel. In the urban area of Freiburg, the Dreisam
Dreisam
itself runs in northwestern direction along the B31. After crossing under the A5 the river flows through March, at the eastern edge of the Kaiserstuhl as well as the western edge of Nimberg towards Riegel, where it leads into the Elz. From 1817 to 1842 the Dreisam
Dreisam
was canalized in its whole length from Kirchzarten
Kirchzarten
to Riegel under the leadership of Johann Gottfried Tulla.[2] However it should be renaturalized in the east of Freiburg at a length of 800m.[3] It overcomes 199m height, from Kirchzarten
Kirchzarten
(337m NHN) until its mouth into the Elz (178m) at Riegel. 135m above or southwards of the river mouth the Glotter
Glotter
leads into the Dreisam, coming from south-southeastern. Northeastern of St. Michaelsberg (241 m NHN), the Alte Dreisam, from south-southwestern, flows into the direct mouth of Dreisam
Dreisam
and Elz. Floods[edit] The 15 km long Leopoldskanal branches off right below the confluence of the earlier mentioned Elz. This canal is used to drain water to the Rhine
Rhine
if the Dreisam
Dreisam
has high-water. The canal ends north-west of Rheinhausen, south-west of Rust and west of the Naturschutzgebiet
Naturschutzgebiet
Taubergießen. The Dreisam's catchment area is especially prone to flooding due to the steep typography and the climatically and orographically high precipitation. From the Feldberg to the Pegel Ebnet the average slope is at 21° or rather 43% downhill grade. Because of its round shape the area has a high aspect ratio of 0.7 and a high circularity ratio of 0.55 which leads to temporal runoff concentration and thus can quickly lead to flooding. The aquifer, which consists primarily of solid rock, absorbs little water and hence leads to quick drainage, particularly in cases of heavy rainfall. Because of melting snow and heavy rainfalls in spring, the maximum amount of draining water runs off in April. Even though the heaviest rainfalls occur in summer, the high water consumption of the local vegetation only leads to secondary drainage maximums. In March 1896 a historic flood killed two people and destroyed several bridges. Among the people that were killed was Carl Siegel, a German jurist. Nowadays floods do usually not cause major damages since the Dreisam
Dreisam
was secured on both sides through walls and channelized from Freiburg onward. However, on December 23, 1991 there was a flood that caused damage in the eastern part of Freiburg. The riverside paths below the bridges of the Mannheim-Basel-Karlsruhe-railway, called Rheintalbahn in German, are often flooded during high water. Even though warning signs have been put up along the path, two cyclists died there in 2010 and 2013 during a flood. In order to prevent accidents like this, the city is planning to install boom gates along the path.[4] Drainage basin and tributaries[edit] The drainage basin of the Dreisam
Dreisam
as far as Riegel covers 568 km². In Germany
Germany
it is therefore characterized as a drainage basin of medium size. The drainage system of the Dreisam
Dreisam
has many branches and can be characterized as a complex first degree river regime which is marked by two major discharges. A maximum discharges can be measured in spring as a result of melting snow. Another major discharge can also be measured in summer or fall depending on when it is raining the most. There are a couple of rivers that coalesce with the Dreisam, which are the headwater streams Rotbach and Wagensteigbach and (ordered towards downstream): Krummbach (which is also called Zastler Bach in the upper section), Brugga, Eschbach and Glotter. Usage[edit] The waters of the Dreisam
Dreisam
used to drive mills and such yield energy for industrial establishments like gem grinderies and tanneries. Today there are still small river power stations like at the Sandfang. In the past, people even caught salmon in the Dreisam, today however, the fishery does no longer have any importance.[5] Nowadays, the Dreisam with its bank paths and meadows serves as a recreational to take walks, refreshing swims or have barbecues. The Dreisam
Dreisam
is also of significance in the matter of individual traffic since on the south bank there are bikeways and on both sides motorways that lead to the city center of Freiburg and the “Zubringer Mitte” (highway 31a) to Beratzhausen. Since 2011, the Dreisam
Dreisam
is also used at the venue of an annual duck race fund-raiser that starts in Freiburg’s city center. Thousands of numbered rubber ducks are tossed into the river and flow a few hundred meters upstream before being fished out again. Coordinates: 47°59′N 7°50′E / 47.983°N 7.833°E / 47.983; 7.833 References[edit]

^ Maier, Bernhard (2003). Kleines Lexikon der Namen und Wörter keltischen Ursprungs. Munich: C.H. Beck OHG. p. 49. ISBN 3-406-49470-6.  ^ Himmelsbach, Iso (2005). Bachabschlag – Von Bächen und Kanälen in Freiburg/Br. Freiburg/Br. p. 39. ISBN 3-00-017055-3.  ^ Mauch, Uwe. "Freiburg: Ein neues Bett für die Dreisam". [badische-zeitung]. Retrieved 2013-08-06.  ^ Höhl, Simone. "Freiburg: Sicherheit: Schranken sollen Radler bei Dreisam-Hochwasser stoppen". badische-zeitung.de.  External link in website=, title= (help); Missing or empty url= (help); access-date= requires url= (help) ^ "Dreisam". badische-seiten.de.  External link in website=, title= (help); Missing or empty url= (help); access-date= requires url= (help)

Literature[edit]

Lange, Jörg (2007). Die Dreisam
Dreisam
– Vergangenheit, Gegenwart und Zukunft. Laori publisher ISBN 978-3-935737-54-8.

External links[edit]

Wikimedia Commons has media related to Dreisam.

Lauf und Einzugsgebiet der Dreisam
Dreisam
at: Map services of the Baden-Württemberg
Baden-Württemberg
State Office for the Environment, Survey and Conservation (Landesanstalt für Umwelt, Messungen und Naturschutz Baden-Württemberg) Dreisam
Dreisam
– Geschichte eines Flusses, die unserer Region den Namen gab (Interessengemeinschaft zur Renaturierung der Dreisam), vom 25. Februar 1999, auf ig-dreisam.de Verzeichnis zum Dreisamtal zwischen Freiburg und Buchenbach, auf freiburg-dreisamtal.de Das Ende der Dreisam, bebilderter Bericht über eine Fahrradtour Freiburg–Mündung der Dreisam
Dreisam
in den Rh

.