Our neighborhood of three acre horse properties is watered by a concrete open irrigation canal that runs between the properties.
The most simple flooding is managed by opening a port into the canal and blocking the canal with a dam. When guided into a small ditch it floods the property and waters the pastures.
My property has pipes the same size as the ports that carry the water under the fence onto my land.
Now I want water on the front of the property in an area I cannot normally flow to, so I would like to run pipe under my gravel drive some 300 feet and bring a port into my forward pasture. I also know some of the neighbors have tried this and failed, but the details of the failure are unknown to me, (and them obviously).
I work with aircraft instrumentation, but it seems clear that if the port is below water level, then water must go in. I even think on my current 10 foot pipes there is something of suction/syphon going on as we get a LOT of water out of a small pipe (12 inches). But if I then turn this pipe down 3 feet, extend it 300 feet and bring it back up to the surface... should the pipe be larger to allow for friction losses; should the pipe be the same size for some undefined syphon effect... or should I plan on installing an open riser to break any syphon...?
I can take the loss of the pipe I will fill but never empty, but it must flow fast enough to keep up with supply, i.e. the current 10 foot section of 12 inch I use now is not a bad measure. But how does one calculate things like head pressure on an open canal?
Any and all welcome, thanks in advance;
Emmett
hydraulic law? What's happening in the pipe? This?
