You would only have to siphon a little bit(an inch over the med. sea level), then it would flow and increase all by itself.

We they get everything set up to my specs, and for the right price, I'll do it.

Dip, close, raise and lay over, open. like siphoning from a ditch. No suction needed.

 

Probably work ok with a 3 inch irrigation channel. I 'd like to see that done with a 30 or 40 inch pipeline!!

 

One could use a pig. Same principle. It won't take much force if the lift is short.

 

That project down in Chile, is a little different. Here, they're gonna use solar power to pump ocean water up to 2 high reservoirs, and then produce hydro power back down to the ocean.

I thought they had oil, but apparently they have to import most.

 

I saw an identical idea to use a fall from a reservoir to power a generator but it was filled by pumps acting on ocean waves instead of solar power. I think it was a Japanese island.

 

BR-549 Use pigs??? Thats animal cruelty. PETA wouldn't like that (people eating tasty animals).

 

An inside plug on a string.

 

You can't pull a siphon over 10 meters. I don't know the terrain but I'm guessing that's the prohibitive factor.

 

You can't pull a siphon over 10 meters. I don't know the terrain but I'm guessing that's the prohibitive factor.

At sea level... at high altitudes it's even lower

 

I was trying to find a reference for seawater but couldn't. It's denser, but has lower vapor pressure also. I suspect the density is the bigger factor and that means you get even less elevation when siphoning seawater. But I was hoping to find the number. I suppose it can be calculated from the vapor pressure and density but it's too late at night for that.

 

I was trying to find a reference for seawater but couldn't. It's denser, but has lower vapor pressure also. I suspect the density is the bigger factor and that means you get even less elevation when siphoning seawater. But I was hoping to find the number. I suppose it can be calculated from the vapor pressure and density but it's too late at night for that.

Vapor pressure is the same as distilled water (to two significant digits). Density is about 3% higher. So, 9.97 rounds to 10 meters from my point of view.

As for earlier comment of desalination, the pressure used determines the amount of desalinated water yield by reverse osmosis. That is, the higher the pressure, the more desalinated water can be obtained from each liter of seawater. The higher the pressure, the more energy required. Yield is less than 10% fresh water per unit of sea water (usually much less).

 

Vapor pressure is the same as distilled water...

How can that be? The boiling point is elevated by the salt. I'll admit it's been a while since I did thermodynamics.

 

How can that be? The boiling point is elevated by the salt. I'll admit it's been a while since I did thermodynamics.

BP elevation is a function of (a) boiling point elevation constant of the solvent (0.5 for water), (b) molal concentration of solute = 3.5% NaCl is 35 grams per kg water or, 0.6 moles and (c) number of ions the solute ionizes into.

Delta T = BP elevation constant x molal concentration x # of ions/solute mole

Delta T = 0.5 x 0.6 x 2 = 0.6 degrees C.

A half degree of boiling point elevation is not going to change the first two significant digits of room temperature vapor pressure.

 

Ah, yes ok. I misread your comment about two sig figs as referring to two figures after the decimal, and thus completely missed your point. The difference between fresh and brackish water is not going to affect most siphons.

 

Sorry for the short notice. There is a show on Nova in a few minutes for an update on the project.

 

Who needs to pump? The Dead Sea is some 400 meters below sea level.

That area is called the "Danakil Depression" in Northern Ethiopia and it's the lowest part of the earth's crust on dry land..

 

I guess if its below the MEd level they could just use a siphon. Dunno whos gunna suck on the end of the pipe to get it started though?

Siphons are fairly common in large water projects such as the Lower Colorado River Project in Owens Valley of California.

 

Death Valley -80 meters.

Danakil Depression -100 meters.

Dead Sea -400 meters.

Plenty of crust around sea.

The project will never be done. That nova episode was an eco propaganda ad against it.

There was no information about the project, only about the damage the project would do.

Another one sided article.

I hardly watch nova anymore. Program description was mis-leading.

Sorry about that.