NASA: Huge Freshwater Loss In the Middle East

dstates writes with news from NASA about the state of available water in the Middle East. From the NASA article: "'GRACE data show an alarming rate of decrease in total water storage in the Tigris and Euphrates river basins, which currently have the second fastest rate of groundwater storage loss on Earth, after India,' said Jay Famiglietti, principal investigator of the study and a hydrologist and professor at UC Irvine. 'The rate was especially striking after the 2007 drought. Meanwhile, demand for freshwater continues to rise, and the region does not coordinate its water management because of different interpretations of international laws.'" dstates adds: "Water is a huge global security issue. To understand the middle east, you need to understand that the Golan Heights provides a significant amount of the water used in Israel. Focusing on conflicts and politics means that huge volumes of valuable water are being wasted in the Middle East, and this will only exacerbate future conflicts. Water is a serious issue between India and China. And then there is Africa. U.S. food exports are in effect exporting irrigation water drawn from the Ogallala aquifer. Fracking trades water for energy, and lack of water limits fracking in many parts of th world. Think about it."

Comments

Re:At the rate that we're drinking water...

[dj245]

Water that is absorbed by the ground and isn't directed into aquifers or similar structures is effectively lost. The rest is lost to the ocean or to evaporation. Granted, you could desalinate the ocean, but then the question becomes what to do with the leftover material, which is an environmental issue unto itself.

You sell it, duh!

Have you priced Sea Salt lately?

We still have operating salt ponds aorund the San Francisco Bay. Often easily identified by their giant piles of salt. Now if they trapped the water evaporated it would be a Win-Win.

These ponds are intended to collect salt, and the water is lost. You can't use a pond for desalination on an industrial scale*. One common method is to boil the water in a partial vacuum to obtain vapor, and discard the brine. Brine's boiling temperature increases the saltier it gets, so at some point it becomes uneconomical to extract the water. Plus transporting brine is easier than bulk damp salt- you just pump it. You could then put the brine in a pond and let nature run its course, but the amount of land required would probably be prohibitive since desalination on useful scales is BIG. It is much easier and cheaper to just pump the brine back to the sea and deal with the environmentalist complaints. Maybe in the future regulations will be stricter but the places that need this water the most are the kind of places that won't care about a saltier ocean.

Incidentally, most desalination processes use large amounts of energy, so that is why the easier water is used up first.

*you can desalinate using a pond or other small body of water on very small scales, but this is not economical on large scales. It is done in survival situations however.