Drum weir

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Schematic representation of the drum weir
A drum weir on the Clackamas River, Oregon, USA

The drum weir (also: drum gate ) is one of the movable weirs with overflow lock. M. Desfontaines constructed this type of weir for the first time; it was realized in the Damery weir on the Marne in 1857.

A drum weir is particularly suitable for medium water levels and very large water levels. Although it requires a particularly complex defense substructure and an elaborate control system, it blends in inconspicuously into the landscape, as there are no superstructures or visible drives.

function

A drum weir consists of a cylindrical sector-shaped hollow body which, when open, rests in a sector chamber and is rotatably mounted on the upstream side.

To activate the weir, head water is allowed to flow into the sector chamber via inlet valves. The buoyant hollow body floats and lifts the retaining wall until the desired retaining height is reached. For lowering, the water is drained from the sector chamber into the underwater.

advantage

Since the damming body is moved and carried by the water in the sector chamber over its entire width, a drum weir can bridge large damming widths without causing significant strength problems. Separate drives such as the roller weir are not required.

Compared to the sector weir

The drum weir is very similar in function and construction to the sector weir, whose triangular float, however, is pivoted on the underwater side instead of the upper water side. Furthermore, in contrast to the sector weir, the drum weir has a closed cross section.

literature

  • Kurt Lecher, Hans-Peter Lühr, Ulrich CE Zanke: Pocket book of water management . 8th completely revised edition. Vieweg, Wiesbaden 2003, ISBN 3-528-02580-8 .
  • Theodor Strobl, Franz Zunic: Hydraulic engineering. Current principles, new developments . Springer, Berlin et al. 2006, ISBN 3-540-22300-2 .

Web links

Individual evidence

  1. ↑ Vide: Annales des Ponts et Chaussees , 5th series, vol. vi, 1873, p. 98
  2. ↑ Kurt Lecher; Hans-Peter Lühr; Ulrich CE Zanke: Pocket book of water management , Vieweg + Teubner; Edition: 8th, 2001, p. 584
  3. ↑ This similarity has historically led to different translations. The English term “drum gate” is correctly translated as drum gate (drum weir) in the Zentralblatt der Bauverwaltung , 1926, p. 122, in other works (magazine: Wasserwirtschaft, Vienna, 1926, p. 437) with sector weir.