yeah it is cool. cost a lot to build, but, running costs are minimal. like £10 a day . they charge each tourist £8 to £10 for a 10 min ride on it. 20 ppl every 20 mins. cuts out 5 hours work to just 5 mins. the doors open down like( |.| \./ _._ \./ |.| ) if that makes sense. all the water in between gets pumped out. the area underneath it is dry.

gate picture
 

should be the picture for the gate

Wow, thanks- cool pic!

Welcome to the Cellar, grapyn.:D

Yes, your operation description is perfectly clear.
The picture shows the set up perfectly.
Thanks for answering my question, plus.

Undertoad, Scottie was supposed to be from Linlithgow - just a matter of minutes from the wheel.