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Passage under canal


MIKE P

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  • 2 weeks later...
On 04/05/2021 at 08:44, David Mack said:

 

 

 

 

Syphons (the conventional sort, not inverted) were fitted to some weirs on the Lee as part of flood prevention works in the 1970s. They consist of a concrete roof over part of the weir crest, with solid walls either side, and the roof extending to just above normal water level on the upstream side and well down the slope on the downstream side. When the river is in flood the upstream entrance becomes submerged, and the flowing water gradually draws the air out to start the syphon operating (in much the same way as sucking air out of a tube to start a syphon). The advantage of the syphon is that it will shift much more water than a simple weir crest of the same length, so can be used where space is limited. When the flow decreases and the upstream level drops, air is admitted through the inlet and the syphon action stops. In low flow conditions it just operates as a normal weir.

 

 


came across this diagram of the Ware Weir siphon in the London Canal Museum archive today

 

 

B75D2738-B18B-4B68-8DFD-C9596ACCE554.jpeg

  • Greenie 1
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Don't forget the Hotopp lock used on the Elbe-Lübeck Canal, which used air pressure generated by water flowing over an enclosed weir to operate the lock. Everything works almost silently.

https://www.wsa-elbe.wsv.de/Webs/WSA/Elbe/DE/Wasserstrassen/06_Elbe-Luebeck-Kanal/Schleusenprinzip_Hotopp.pdf?__blob=publicationFile&v=1

 

1900 Hotopp 128.jpg

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