Rigole de la montagne

Last updated
Rigole de la montagne Rigole de la montagne02.jpg
Rigole de la montagne

The rigole de la montagne (English: trickle of the mountain) was an important facet of the Canal du Midi, engineered by Pierre-Paul Riquet in southern France. The canal itself was built during 1666-1681. A critical aspect of the Canal du Midi was the supply of sufficient water to feed the canal. Each boat traversing its length would require a large quantity of water in the locks in order to climb or descend.

Contents

The original plan was to take water from the Sor River at Revel via the rigole de la plaine and transport it to the Bassin de Naurouze to provide a source of water for the canal. To placate mill owners fearful that they would lose too much water from the Sor, the rigole de la montagne would supplement the Sor upstream from the rigole de la plaine at Conquet. It was to collect water from the Alzau stream, as well as others, and divert them to the River Sor at Conquet. [1] [2]

In 1664, Louis Nicolas de Clerville had the idea for a single large dam of the Laudot valley near Saint Ferreol, which became the Bassin de Saint-Ferréol. He also had the idea of digging a tunnel through the Cammazes ridge to connect the rigole de la montagne to the reservoir in the valley without utilizing the Sor river at all. [2] In 1686, the engineer, Marshal Sebastien Vauban, extended the rigole de la montagne7.2 kilometres (4.5 mi) from Conquet to connect it to the Bassin de St. Ferréol. The path included a 121-metre (132 yd) long, 2.7-metre (9 ft) diameter tunnel at the village of Les Cammazes. [1]

To reduce leakage in some locations, the trench is lined with bricks. [3] Beautiful walking paths accompany the waters flow.

The following is translated from the French Wikipedia article of this same name:

The channel begins at the intake of the Alzau (altitude 645 metres (2,116 ft)) to Arfons in the Black Mountains and empties into the rigole de la plaine, which supplies water to the Canal du Midi. The trench collects waters from the southern slope of the Black Mountains. It collects water from different streams, especially Bernassonne, the Alzau, the Lampy, and Rieutord, and the dammed Galaube. It runs south of the reservoir Cammazes (which did not exist at the time of construction of the canal).
A little further south of the village Les Cammazes, the channel changes its slope and passes to the north side. To cross the mountain, it goes through a tunnel masonry arch, the arch of Vauban, also called Breakthrough Cammazes. The tunnel is 122 metres (400 ft) long and 3 metres (9.8 ft) wide. The bridge was designed by the architect Vauban, after the death of Riquet. The front of the exit tunnel was rebuilt in the 18th century. Before the digging of the tunnel, the Rigole Mountain fed the Sor River in Conquet at an altitude of 620 metres (2,030 ft). The Sor was captured by the trickle of the plain near Sorèze at the Bridge Crouzet (altitude 245 metres (804 ft)). Leaving the Breakthrough Cammazes, the channel flows into the stream of Laudot, which itself feeds the reservoir Bassin de Saint-Ferréol.

Related Research Articles

Canal du Midi

The Canal du Midi is a 240 km (150 mi) long canal in Southern France. Originally named the Canal royal en Languedoc and renamed by French revolutionaries to Canal du Midi in 1789, the canal was at the time considered one of the greatest construction works of the 17th century.

Pierre-Paul Riquet

Pierre-Paul Riquet, Baron de Bonrepos was the engineer and canal-builder responsible for the construction of the Canal du Midi.

Sainte-Anne River (Beaupré)

Ste-Anne-du-Nord River is a tributary of the northwest shore of the Saint Lawrence river where it flows at the height of Beaupré. This river flows in Capitale-Nationale, in the province of Quebec, Canada. The river passes through Canyon Sainte-Anne before joining the Saint Lawrence River at Beaupré.

Canal Latéral de la Garonne Canal in France

The Canal de Garonne, formerly known as Canal latéral à la Garonne, is a French canal dating from the mid-19th century which connects Toulouse to Castets-en-Dorthe. The remainder of the route to Bordeaux uses the river Garonne. It is the continuation of the Canal du Midi which connects the Mediterranean with Toulouse.

Summit-level canal

A summit-level canal is an artificial waterway connecting two separate river valleys. The term refers to a canal that rises then falls, as opposed to a lateral canal, which has a continuous fall only. Summit-level canals were an essential step in developing transport systems connecting different parts of a country before the railways or modern road transport.

Malpas Tunnel

The Malpas tunnel carries the Canal du Midi under the d'Ensérune hill in Hérault, France. Excavated in 1679, it was Europe's first navigable canal tunnel and is a monument to the determination of Pierre-Paul Riquet, the chief engineer. It is located in the commune of Nissan-lez-Ensérune near to the archaeological site Oppidum d'Ensérune.

Canal de lOurcq Canal in northeastern France

The Canal de l'Ourcq is a 108.1 km (67.2 mi) long canal in the Île-de-France region with 10 locks. It was built at a width of 3.20 m (10.5 ft) but was enlarged to 3.7 m (12 ft), which permitted use by more pleasure boats. The canal begins at Port-aux-Perches near the village of Troesnes, where it splits from the channeled River Ourcq, and flows to the Bassin de la Villette, where it joins the Canal Saint-Martin. Paris requires 380 000 m3 of water daily for cleaning the sewer system, gutters, and parks. The Canal de l'Ourcq provides about half of the requirement. Since 1983, the waterway has been designated for use by pleasure craft, and its water is designated for non-drinking uses.

Locks on the Canal du Midi

There are 91 working locks on the Canal du Midi along its 240-kilometre (150 mi) course from the Bassin du Thau on the Mediterranean coast to the junction with the Canal lateral a la Garonne in Toulouse. There are a further 13 locks on the 37-kilometre (23 mi) La Nouvelle branch which runs through Narbonne to the Mediterranean at Port-la-Nouvelle. The locks are all under the management of the French navigation authority, Voies navigables de France.

La Nouvelle branch

The La Nouvelle branch is a 37.3-kilometre (23.2 mi) branch of the Canal du Midi in Aude, southern France which runs from the Canal du Midi through Narbonne and on to the Mediterranean. It is made up of three waterways: the first 5.1 kilometres (3.2 mi) is the Canal de Jonction from the Canal du Midi to the Aude, the second section is 800 metres (2,625 ft) of the Aude itself and the third is the 31.6 kilometres (19.6 mi) Canal de la Robine which enters the Mediterranean at Port-la-Nouvelle. The La Nouvelle branch is designated a UNESCO World Heritage Site as part of the Canal du Midi and is managed by the French navigation authority, Voies navigables de France.

Bassin de Saint-Ferréol

The Bassin de Saint-Ferréol was created as the result of a large earth dam across the mouth of the valley of Laudot stream at St. Ferréol in the Montagne Noire. It was originally proposed by Chevalier de Clerville and accepted by Pierre Paul Riquet as an integral part of the Canal du Midi. Riquet needed to provide a sufficient water reservoir to allow the locks to function year round, even in the dry summer season. The dam was begun on 15 April 1667 and was completed in four years. It was the first dam built specifically to supply water to a navigable canal and was by far the greatest single work of civil engineering undertaken during the building of the Canal du Midi.

Seuil de Naurouze

The Seuil de Naurouze, or Col de Naurouze, is the highest point of the Canal du Midi in southern France. It is the watershed point identified by Pierre-Paul Riquet when he designed and built the canal. Water falling on the western side of this point flows to the Atlantic Ocean and on the eastern side to the Mediterranean Sea. It is on the border of the department of Haute-Garonne and the department of the Aude.

Bassin de Naurouze

The Bassin de Naurouze is an octagonal holding tank, created during the building of the Canal du Midi as designed and built by Pierre-Paul Riquet. It was abandoned a few years after construction of the canal because of its recurrent silting problems. The flow of water from the Bassin de Saint-Ferréol joins the Canal du Midi at this point near the Seuil de Naurouze. Riquet hoped to build a city around the basin and also considered building a port. However, it easily filled with silt and its use discontinued. A lawn replaced the empty pool, and it is crossed by a straight path lined with plane trees.

Cesse Aqueduct

Cesse Aqueduct is one of several aqueducts, or water bridge, created for the Canal du Midi. Originally, the canal crossed the Cesse on the level. Pierre-Paul Riquet, the original architect of the canal, had placed a curved dam 205 metres (673 ft) long and 9.10 metres (29.9 ft) high across the Cesse in order to collect water to make the crossing possible; the aqueduct replaced this dam.

Louis Nicolas de Clerville, a.k.a. Chevalier de Clerville, held many military positions during his life in France in 1610–1677. He was associated with Pierre-Paul Riquet and the building of the Canal du Midi.

Rigole de la plaine

The critical feature of the Canal du Midi was to provide sufficient water to ensure that the lock system continued to function, even through the summer months. The first part of this endeavor was the rigole de la plaine. It carried water from the Sor River, at Pontcrouzet, to the Bassin de Naurouze, where the water was to enter the canal. This was done in 1667.

Bassin de Lampy

The Bassin de Lampy was created during 1777 and 1781 when a dam was placed on the Lampy Valley in the Aude department in south-central France. The reservoir provides a source of water for the Canal du Midi. It was originally proposed in 1665 by the commission created by Louis XIV of France to evaluate Pierre-Paul Riquet's plan for the canal enterprise.

The balancing of incoming and outgoing water allows the Canal du Midi to operate as it does. Each time a lock operates, large quantities of water are either required to fill it or dump from it into the lower level pound. There must be a constant source of water in order to fill and the excess water dumped must have a place to exit the canal without it overflowing. Being able to provide this water source was one of the most important problems to be solved by Pierre Paul Riquet, its creator.

Riquet Obelisk

The Riquet Obelisk is dedicated to the creator of the Canal du Midi, Pierre-Paul Riquet. In 1827, the heirs of Riquet built the monument. The obelisk has a dedication: "To Pierre-Paul Riquet, Baron Bonrepos, author of the Two Seas Canal in Languedoc". It is erected near the site of the former octagonal holding tank, called the Bassin de Naurouze, created during the building of the Canal du Midi.

Couzon (Gier)

The Couzon is a river in the Loire department of France, a tributary of the Gier, which in turn is a tributary of the Rhône. A dam on the river, built to serve as a reservoir for the Givors canal, now provides drinking water to the town of Rive-de-Gier.

The rivière du Mont Saint-Étienne is a tributary of the Sainte-Anne river, flowing on the north bank of the Saint Lawrence River, in the unorganized territory of Lac-Jacques-Cartier and the municipality of Saint-Ferréol-les-Neiges, in the La Côte-de-Beaupré Regional County Municipality, in the administrative region of Capitale-Nationale, in the province of Quebec, in Canada.

References

  1. 1 2 Rolt, L. T. C. (1973). From Sea to Sea. Ohio University Press. ISBN   9780713904710.
  2. 1 2 Mukerji, Chandra (2009). Impossible Engineering: Technology and Territoriality on the Canal du Midi. Princeton University Press. ISBN   978-0-691-14032-2.
  3. "Montagne-Noire Rigole-de-la-Montagne" . Retrieved 12 October 2009.