As farmers try to be more productive, as in Canterbury, and want to take more water, either for free or at an expense [ as I just heard somebody ranting at on Morning Report] there is a warning coming from Iraq.
http://www.nytimes.com/2010/06/13/science/earth/13shatt.html?th&emc=th
Here the reduction in flow of the river is permitting salt water to encrouch up the river from the sea and also the flushing effect is greatly reduced leading to pollution. Perhaps we are just too clever us humans and one eyed in our endeavours.
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