|Jan12-13, 05:51 PM||#18|
Flow rate of water dropping out of a pipe
Your point about a local hump in the pipe trapping an air bubble is a good one, however.
|Jan14-13, 03:12 AM||#19|
My original question had a lot to do with why the pipe is delivering so little water. It's possible that there is an air pocket, but it's also possible that there are roots in the pipe. I do clean the pipe every year and in doing so I remove a small amount of silt and fine roots from the pipe, but this only increases the flow marginally.
The conclusion so far is that there is no sense in dividing the pipe into 2, which would facilitate better cleaning and inspection, because that would not increase the flow of the 2 halves. Why not, is not clear to me, but I accept the advice on this point.
Perhaps you could explain, if the head of water is caused by the dimensions of the pipe, why can't I remove the head by reducing the dimensions? I can see that the diameter of the pipe is a restriction to the flow, but I don't see why the length of the pipe is not relevant. I can't imagine the water not flowing through the pipe if it were only 30cm long instead of 30m, because the friction loss would be so much smaller.
If I had an open pit 30m long with a 10cm inlet and outlet, are we saying that the outlet would not allow any more water to pass than it does now?
|Jan14-13, 04:30 AM||#20|
My advice is to cross a local farmer's palm with silver.
Since you live in an area of good surface and groundwater many farmers will have a land drainage plough such as this.
You could get a new P2 pipe in plastic installed easily and cheaply this way, but go for at least 6 inches. A 30 mete run is almost nothing, This pipe comes on 100m+ rolls.
Much smaller machines are also in use but you get the idea from here.
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