It’s a not very well known fact that in the U.K. canals have ‘trap doors’ to drain the canal for cleaning or for emergency usage to drain the canal.
This one is at Lock 89 on the Rochdale Canal in Manchester, marked by an arrow on the side of the toe path of the canal.
It drains into the long ago culverted River Tib that runs 16-20 feet below the canal and runs to the nearby River Medlock.
The ‘trap door’ is by no means large.
But that wooden hatch, built into a wooden frame was built 215 years ago, just sitting there, doing it’s job, waiting to be utilised.
As amazing as these were built be hand with very little in the way of machinery, just as amazingly they built in a redundancy into something as simple as a canal, also amazing is that these canals though extremely busy when built are still be used today and have stood the test of time.
After the clean up, looking nearly new again.