Talk:Disi Water Conveyance

Elevation difference between Disi and Amman
The elevation difference between Disi and Amman is not 1,300m, as indicated in the article. The source does say 1,300m, but the source is wrong. Amman is at about 1,000m above sea level and Disi is certainly not below sea level. It is rather at about 700m above sea level, so that the difference in altitude is about 300m.--Mschiffler (talk) 09:17, 28 February 2011 (UTC)
 * If you're right, there could always be hills or other barriers that they have to go up and back down the other side. Then they count all the ups.  For example, if you go up a 100m hill and then back down 70m on the other side, you've still climbed 100m that day.  But, that could all be wrong.  If we get a source that says 300m, we can change it.  --E♴ (talk) 14:44, 28 February 2011 (UTC)
 * The dynamic pumping head of the conveyor is given as about 800m according to the website of an engineering consulting firm involved in the project:http://www.ccjo.com/Projects/Environment/DISIMUDAWWARATOAMMANWATERCONVEYANCESYSTEM/tabid/559/Default.aspx. Another article says it is 1000m:http://www.globalwaterintel.com/archive/10/6/general/amman-looks-to-boost-supply-and-plug-the-leaks.html There is indeed a mountain range between Disi and Ma'an, a city through which the pipeline passes. Water first has to be pumped up, then flows down by gravity until it reaches a low point South of Amman, and then has to be pumped up again. The pipeline follows the road from Saudi Arabia to Ma'an and then the road to Amman. As a rough approximation, I checked the altitudes along the roads using Google Earth. On that basis the first elevation differential starts at about 800m in Disi-Mudawara (not 700m as I had said from memory above) reaching a high point at about 1150m from where water flows down by gravity to about 700m. The second elevation differential is about 300m up to the reservoirs near Amman. The two differentials (450m and 300m) add up to 750m, close enough to the 800m figure quoted above. The source for the 1300m figure is the journal of the Institute of Electrical and Electronics Engineers, which is a source that one would normally trust. But in this case I believe they probably did not double-check their primary source (which is not indicated in the article quoted). I leave it up to you to keep the article as it is or to make the change.--Mschiffler (talk) 21:00, 28 February 2011 (UTC)
 * Well, I see you know what you're talking about, and you do have point.  I wouldn't want to change it myself without a source, but if you change it, I won't change it back. --E♴ (talk) 00:10, 1 March 2011 (UTC)

Missing points
Since this article has been nominated as a good article and a good article has to be, among other things, broad in coverage I wanted to point out two important issues that should in my view be addressed in order to make the article broad in coverage:
 * The aquifer is shared with Saudi Arabia, which uses large amounts of water from the same aquifer for irrigation in the Tabuk Province. Withdrawal in Saudi Arabia affects the availability of water for the Disi conveyor and vice versa.
 * Compared to the technical issues, financing is, in my view, not covered sufficiently. Loans for the project are provided by the French Development Agency and the European Investment Bank. The project is executed as a Build-operate-transfer project. This means that high fees will have to be paid to the private operator for the supply of bulk water to Amman, which will exercise an upward pressure on water tariffs or end up as a fiscal burden for the government. It may be useful to also mention the high level of non-revenue water in Amman and Zarqa, as well as the effort to reduce it.--Mschiffler (talk) 07:08, 15 March 2011 (UTC)
 * Thanks. I'll try and work on it later this afternoon, although you are, of course, welcome to work on the article too. --  E♴  (talk)  13:42, 15 March 2011 (UTC)
 * I added a lot of information- hopefully this covers it. Thanks for the suggestions. --  E♴  (talk)  00:18, 16 March 2011 (UTC)
 * Consortiums, BOTs, contracts. Often complex and confusing but necessary to mention. These are some good comments I mentioned in the GA review, feel welcome to help in anyway.--NortyNort (Holla) 11:53, 5 April 2011 (UTC)

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