what is an irragation canal?
956994
A permanent irrigation conduit constructed to convey water from the source of supply to one or more farms.
121975
The machine consists of a screw inside a hollow pipe. The lower end of the device is put in the water, and the screw is then turned (usually by a windmill or by animal or human labor). As the bottom end of the tube turns, it scoops up an amount of water. This puddle of water will slide up in the spiral tube as the shaft is turned, until finally it falls out from the top of the spiral tube and feeds the irrigation system.
96724
pyloric portion (pylorus): includes the pyloric antrum (the entryway to the pyloric canal), the pyloric canal, and the pylorus proper, which thickens to form the pyloric sphincter. It is separated from the body by the angular notch. (Greek, pyloros = gatekeeper, Latin, antrum = cave)
370056
In short (ok bad choice of words), we need it to extract as much as we can from the food we eat. Long canal = large internal surface areafor absorption. There are lots of other adaptations to increase this as well.
993075
irrigation channels???
190822
Checking the barrel for obstructions?
639446
That is a mighty big canal you are talking about building. That is way to much man power and way to difficult to accomplish. And what good would it do?
922456
It is called a meander or an oxbow.  Wikipedia has a good explanation.
866711
tell you what I know off the top of my head.\n\nA lined canal is just that - a ditch lined with something, usually either concrete or a film membrane, to conserve water by preventing it from seeping into the ground. This is especially important where the canal crosses a lot of sandy ground where water percolates easily into the substrate, and/or in areas where water is a very limited, valuable commodity, as it is in the Southwestern U.S. It's not terribly important, usually not cost effective - and maybe even completely unnecessary - in canals that flow over extremely dense, clay soils, or where there is plenty of it.\n\nLots of people oppose the lining of canals, however, because stopping the seepage dries up wetlands and trashes agriculture in areas that depend on the water that finds it's way into areas adjacent to the canals, either in the form of runoff or the recharging of local aquifers.
1169821
Here are some sites. Don't know exactly what you're looking for.\n\nhttp://www.lmnoeng.com/Flow/SmallOrificeGas.htm\nhttp://www.mysolv.com/OrificeCalcIn.asp\nhttp://www.gpengineeringsoft.com/pages/pdtpipedrop.html\nhttp://www.eng-applications.com/orifice.htm\nhttp://www.controlengineering.se/flowcalc/flowcalceng.htm\nhttp://www.pipeflowcalculations.com/
78375
Simply stated, RO is a membrane process, which removes both organic molecules and salt ions from a solution (typically water). The membrane sieves organic molecules and repels salt ions while passing pure water through the micropores in its surface.\n\nThe driving force behind RO is pressure, which is typically supplied by a centrifugal pump. This pressure is needed to overcome the inherent osmotic pressure of the solution and to supply enough energy to force water through membrane pores which are only about 5 angstroms in diameter (by comparison, a human hair has a diameter of about 500,000 angstroms).\n\nThe basic components of an RO system are the prefilter, a pump, and sepralators (spiral-wound membrane elements). The sepralators are placed in stainless steel or PVC housings, which are then manifolded together.\n\nRO systems operate in a crossflow mode whereby a single stream is fed into the RO and flows across the membrane surface. Two streams exit--the permeate and the concentrate. The permeate stream contains the water which passes through the membrane and is purified. The concentrate stream contains the water, salt ions, and organic molecules that do not pass through the membrane; the concentrate is typically plumbed to drain.\n\nThe advantage of operating in the crossflow mode is that it minimizes plugging of the very small membrane pores. However, as a result of crossflow operation, only a percentage of the feed is collected as permeate. This ratio of the permeate to the feed is called the "recovery" of the RO. Though it would seem that one would want to have as high a recovery as possible, there is a trade off--the higher the recovery goes, the poorer the permeate quality becomes. In practice, the majority of RO systems producing less than 15,000 gallons of permeate per day operate at 33% or 50% recovery.
1176123
Responses without sources are not answers, just opinions.\n\nA tidal bore (or just bore, or eagre) is a tidal phenomenon in which the leading edge of the incoming tide forms a wave (or waves) of water that travel up a river or narrow bay against the direction of the current. As such, it is a true tidal wave (not to be confused with a tsunami).
63716
It's called the bore evacuator. It softens the backward recoil energy of the gun when it fires by providing an enlarged space for the proppelant gases to expand into.
65968
The water in the toilet is inside a "knee", basically an s-shaped combination of curved tubes. If the far side of the tube develops underpressure, some of the water will be pulled over into the far side, and water level will sink.\n\nPressure on the far side can oscillate. Usually the waste water system is connected to outside pressure via a separate chimney. On windy days, this chimney may act like a jet pump, reducing the inner pressure of the canalisation, so that water will be sucked into the falling side when the oscillation goes that way, lowering the water level.\n\nAnother possible source of oscillation are huge amounts of water flushed at once, moving down the tube pushing all the air below and leaving lower pressure above.\n\nBarometric pressure shouldn't really come into this, since canalisation and the open air are connected. However high or low the pressure, it ought to be the same inside the canalisation unless strong wind makes the chimneys act like jet pumps.\n\nNow, at which air pressures do you observe strong wind?
702037
I have never heard of the term.  I would guess that it is the distance from the furthest portion of a tributary area to the outlet of the area.
15792
It is that shape because it comes down a long shape tunnel and with pressure. So it is compress together.
529863
It's a man-made tributary, called the Chain-of-Rocks canal.  It was made to bypass a particularly difficult part of the Mississippi River for the barges.