The Montech water slope is a type of
canal inclined plane
An inclined plane is a type of cable railway used on some canals for raising boats between different water levels. Boats may be conveyed afloat, in caissons, or may be carried in cradles or slings.
History
Inclined planes have evolved over the ...
built on the
Canal de Garonne
Canals or artificial waterways are waterways or engineered channels built for drainage management (e.g. flood control and irrigation) or for conveyancing water transport vehicles (e.g. water taxi). They carry free, calm surface flow un ...
, in the commune of
Montech
Montech (; oc, Montuèg) is a commune in the Tarn-et-Garonne department in the Occitanie region in southern France.
On the Canal de Garonne
Canals or artificial waterways are waterways or river engineering, engineered channel (geo ...
,
Tarn-et-Garonne
Tarn-et-Garonne (; oc, Tarn e Garona ) is a department in the Occitania region in Southern France. It is traversed by the rivers Tarn and Garonne, from which it takes its name. The area was originally part of the former provinces of Quercy and ...
, Southwest
France
France (), officially the French Republic ( ), is a country primarily located in Western Europe. It also comprises of Overseas France, overseas regions and territories in the Americas and the Atlantic Ocean, Atlantic, Pacific Ocean, Pac ...
. It is managed by the publicly owned
Voies navigables de France
(VNF, en, Navigable Waterways of France) is the French navigation authority responsible for the management of the majority of France's inland waterways network and the associated facilities—towpaths, commercial and leisure ports, lock-keeper's ...
and by-passes a series of five
locks
Lock(s) may refer to:
Common meanings
*Lock and key, a mechanical device used to secure items of importance
*Lock (water navigation), a device for boats to transit between different levels of water, as in a canal
Arts and entertainment
* ''Lock ...
. The slope is used for larger vessels up to 40 metres in length, while smaller boats continue to use the locks.
The slope has been out of service since an engine failure in 2009, and was scheduled to reopen in the summer of 2020.
Operating principles
The principle of the
water slope
A water slope (french: Pente d'eau) is a type of canal inclined plane built to carry boats from a canal or river at one elevation up or down to a canal or river at another elevation.
History
In 1885, German engineer Julius Greve published draf ...
is based on a sloping channel up or down which a wedge of water retained by an (almost) watertight gate is moved. This technique was invented in the 19th century by the German engineer
Julius Greve and described by the French engineer
Jean Aubert in 1961.
The Montech water slope was inaugurated in July 1974.
An evenly sloping concrete channel is fitted with a gate at the top, round which a continuous trickle of water is allowed to flow, to compensate for any leakage. The lower gate, which can be lifted, is mounted on a yoke between two ex-railway locomotives, which run on concrete tracks ether side of the channel.
To allow a boat to ascend, the lower gate is lifted, the boat enters the channel, and then the gate is lowered behind it, leaving it floating on an isolated a wedge of water. The locomotives ascend the slope, pushing the water wedge in front of the lower gate. When the water level in the wedge matches that of the upper canal, the upper gate is opened and the boat is allowed to float free. To descend the process is reversed.
Details of the machinery
By virtue of its power and ingenuity the slope's mobile barrier is the key to the system. It consists of:
* Two locomotives, rigidly connected together by a cross-piece which spans the channel, with the locomotives travelling on the channel's banks.
* The gate, which acts as a big slide-valve, connected to the rigid cross-member by an arm.
* A horizontal beam serving as a shock absorber between the boats and the gate.
Each diesel electric locomotive has a power of distributed to drive motors on each of the four axles, each with two large pneumatic tyres.
The three contact faces of the gate with the channel are equipped with seals to keep the wedge of water in place. The gate is raised or lowered using a hydraulic ram.
The shock absorber is a hydraulically levelled hinged metal frame. It allows boats to be connected to the gate during ascents and descents. An electronic system keeps motion gentle and smooth. Finally triple brakes slow the system without jerks.
Design features
* Weight of the engines: 200 tonnes
* Pushing effort: 60 tonnes
* Speed: 4.5 km/h
* Volume of water moved: 1,500 m
* Slope of the channel: 3%
* Height of the slope: 13.30 m
* Depth of water wedge moved: 3.75 m
* Length of the water wedge: 125 metres
* Power of the locomotives: 2 ×
* Length of the channel: 443 m
* Width of the channel: 6 m
* Duration of passage: about 6 minutes
* Length, width and capacity of the boats: 38.5 m, 5.5 m and 250 tonnes.
Publicity
The Montech water slope was featured in an episode of the 2005
BBC #REDIRECT BBC #REDIRECT BBC
Here i going to introduce about the best teacher of my life b BALAJI sir. He is the precious gift that I got befor 2yrs . How has helped and thought all the concept and made my success in the 10th board exam. ...
...
's French Odyssey.''
Shown as a segment of "Mysteries of the Abandoned" (2018) S2:E7 - Amazon Ghost Town
Also featured in an episode of "Abandoned Engineering" on the Yesterday channel in the UK (Series 2, episode 6).
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