1. It's old (obviously). Boards (for walking across) seem too rotted
to hold much weight.
2. I don't think it's wide enough for a tractor to drive across, but
it's obviously not just for human foot traffic, right?
3. The ditch of water beneath it is maybe 10-15 feet wide. I think
it's a man-made tributary from the Chippewa River. It seems to run
neatly along the boundaries of farm quarter sections in the area. The
bridge seems to connect two farms across the water.
Was the water used for irrigation, do you think? What role did the
bridge play? Thanks if you can help (or direct me to another source).
Looks like a pulley bridge where only one side is opened up
one side up into the air) to let traffic (boats) through.
There's probably a hundred and one things that the water was
for but since it was made to open, the water was definitely
to bigger waters. Most likely dug wider and deeper by man
accumudate irragation for the two farms.
in WA who is just guessing.....
That looks like a canal for transporting small barges... often they
would be spanned by variously configured Bascule bridges... used for
foot, cart, and livestock traffic. The one you depicted is probably
no longer used.
I suspect that the "bridge" served to hold a "hydralic ram" which uses the
velocity of the water to pump a small portion of the water to the level of
the surrounding fields.
OR, it could just be a structure to hold a water turbine is the center of
The structure in the middle tooks like something used to pull something
normall in the stream bed to the level of the bridge floor for maintenance.
I do but I'd love to see a cite that would prove me wrong. I have a use for
such a beast.
A stream can certainly be used to do that with a hydraulic ram but the
stream must allow the water to drop into the ram not just flow past it
gently like the water does in a slow moving irrigation channel.
I'd certainly be very interested to see a pic of any hydraulic ram that
works as you say it will. I can't see how a slow moving stream can make
use of the water hammer effect that gives the 'ram' its name but I'd
certainly like to know more details. Can you post a cite please.
The system I referred to sat right on the edge of the stream. The
stream was a 'gentle one'. The input pipe ran a distance up the
stream so I guess you could say 'dropping into the ram'. Yes, there
has to be an elevation difference but there is no "dropping into the
ram' in any sense the normal person would use.
You could look it up on the 'net.
Sorry Harry K but I'm tagging onto a response from Billy. (Thanks Billy for
responding as otherwise I wouldn't have seen this) I have not ever seen any
post from you Harry on this subject but your comment suggests that you have
written something on this before. I have seen no other post from you other
than this reply from Billy.
As I mentioned earlier, a stream can indeed be used to operate a ram. And
indeed it can be used in just the way you describe. But as I also wrote
there MUST be a drop. That drop does not have to be like a mini waterfall
immediatley above the ram. It can as you mention come from a considerable
distance upstream (usually by pipe) to allow for the drop into the ram.
Any 'normal person' with half a brain cell should be able to figure out that
water flowing to a ram downstream from an intake pipe forms a 'drop'. And a
'drop' there must be (at least there must be a drop unless they have
inveneted something new that no longer operate using water hammer
I never said any such thing!!!! But in an odd way, you have hit the nail on
the head as to why the bridge could never have been used for a hydraulic ram
A 'head' of water can be provided by a pipe bring the water some distance as
we've both already agreed. It CAN also be provided by a waterfall or even a
header tank (not that I mentioned any means of how the drop was achieved to
the ram despite what you erroneously thought).
But to go back to that bridge which is high above an irrigation channel. As
you probably know, irrigation channels are a body of slow moving water and
they are on very gently slope. Just how far upstream do you think the inlet
pipe would need to be to provide a head for a hydraulic ram situated that
high above the water on that particular bridge? That bridge never held any
ram because as we both know, there needs to be that 'drop'. How many miles
would a pipe have been run back up that irrigation channel to allow a drop
to run a ram sitting up on that bridge?
I don't know if I have you kfed or not. I tend to killfile habitual drongos
or loonies. Sometimes posts just go missing. It seems to be happening more
as time goes on and ISPs are getting funny about usenet.
Referring to the photo, I disagree with "high above".
One of the puzzling things about the possibility of it having been used
as a conventional bridge is that it was set down into cuts in the banks.
Also, the previous exchange in context was:
John Gilmer wrote:
"I suspect that the "bridge" served to hold a "hydralic ram" which uses
the velocity of the water to pump a small portion of the water to the
level of the surrounding fields."
"Nope. Hydraulic rams need a head of water above the pump so that the
water drops into the ram. - its the action of the water falling into
the ram that makes the pumping happen."
Part of the reason I interpreted your "drops" and "falling" literally was
that you were explicitly disagreeing ("Nope") with what John G wrote.
Well you may disagree but it'd be at least 4 ft to the top of a hydraulic
ram situated on that bridge.
Am I now missing posts from you too? I haven't seen anything from you about
how you were interpreting what I wrote, but if you'd asked I'd have told you
that "Nope" was in reference to the structure being used to hold a ram.
Except ... it's the bridge you refer to as being "... high above an
irrigation channel." It's unknown whether the hypothetical ram was
situated on the bridge or suspended from it.
My participation in the thread had been about the OP's and other bridges,
not pumps/hydraulic rams. So, you didn't miss any (previous) post of
mine in which I commented on hydraulic rams.
Now, I am confused. Are you saying you meant the "Nope" to refer to the
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