Ognon Aqueduct
Encyclopedia
The Ognon Aqueduct is one of several aqueducts on the Canal du Midi
. It was built in 1826-27 to replace the troublesome level crossing of the Ognon River
.
The seemingly little River Ognon
which normally trickles underneath the canal
can, in the event of a cloudburst
in the hills, can swell to such an extent that it floods the canal
. The lock keeper
then has to close the floodgate
preventing through navigation
until the floods subside.
Canal du Midi
The is a long canal in Southern France . The canal connects the Garonne River to the on the Mediterranean and along with the Canal de Garonne forms the Canal des Deux Mers joining the Atlantic to the Mediterranean. The canal runs from the city of Toulouse down to the Étang de Thau...
. It was built in 1826-27 to replace the troublesome level crossing of the Ognon River
Ognon (Franche-Comté)
The Ognon is a river of eastern France. It is a left tributary of the Saône, which it joins in Pontailler-sur-Saône. Its source is in the Vosges mountains near the Ballon d'Alsace.The Ognon flows through the following départements and towns:...
.
The seemingly little River Ognon
Ognon (Franche-Comté)
The Ognon is a river of eastern France. It is a left tributary of the Saône, which it joins in Pontailler-sur-Saône. Its source is in the Vosges mountains near the Ballon d'Alsace.The Ognon flows through the following départements and towns:...
which normally trickles underneath the canal
Canal
Canals are man-made channels for water. There are two types of canal:#Waterways: navigable transportation canals used for carrying ships and boats shipping goods and conveying people, further subdivided into two kinds:...
can, in the event of a cloudburst
Cloudburst
A cloudburst is an extreme amount of precipitation, sometimes with hail and thunder, which normally lasts no longer than a few minutes but is capable of creating flood conditions.-Etymology:There are similar names for such events in other languages...
in the hills, can swell to such an extent that it floods the canal
Canal
Canals are man-made channels for water. There are two types of canal:#Waterways: navigable transportation canals used for carrying ships and boats shipping goods and conveying people, further subdivided into two kinds:...
. The lock keeper
Lock keeper
A Lock keeper, or lock operator looks after a canal or river lock, operating it and if necessary maintaining it or organizing its maintenance. Traditionally, the lock keeper lived on-site, often in a small purpose-built cottage. The occupation is dying out...
then has to close the floodgate
Floodgate
Floodgates are adjustable gates used to control water flow in flood barriers, reservoir, river, stream, or levee systems. They may be designed to set spillway crest heights in dams, to adjust flow rates in sluices and canals, or they may be designed to stop water flow entirely as part of a levee or...
preventing through navigation
Navigation
Navigation is the process of monitoring and controlling the movement of a craft or vehicle from one place to another. It is also the term of art used for the specialized knowledge used by navigators to perform navigation tasks...
until the floods subside.