David,
Lift height may be a factor, especially with vertical doors and not the usual
swinging doors.
After all, the vertical doors have to go down below the river bed bottom and
that may limit the maximum lift per lock.
Remember that no door is ever opened with a water depth differential across it.
Bill
On Dec 7, 2019, at 14:38, David Young <dsy@xxxxxxxxxxxxx> wrote:
Hi Bill!
Actually, no. I don't know... but I can surmise. The total lift at the Iron
Gates, depending on water levels in the river, is between 20 & 28 meters (or
roughly 65 to 115 feet).
I would think at 115 feet lift on a single gate would make it almost
impossible to open. Thus, the two-stage approach.
If someone has a better idea, I'm all ears, as I'd like to know, too!
David.
David,------
I've been through all the locks on the Erie Canal, those up the Hudson
to Lake Champlain and all of those on the passage up the Elbe from
around Berlin, across a connecting canal, and down the Danube to
Budapest and I never saw a dual chamber lock.
Any idea why these were built this way?
Thanks,
Bill
On Dec 7, 2019, at 09:32, David Young <dsy@xxxxxxxxxxxxx> wrote:
From a number of off-list emails, it is apparent that some (perhaps
most) of us have never gone through a lock on a river and are unclear
on how they work.
So, I've put together 6 images, with a few notes. For those who want
to know more, or just like looking at more photos, it's here:
http://www.furnfeather.ca/look/irongates.html
Enjoy!
David.
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