
Studying the area, I have learned today a new concept in water management: "Interruptible customers". The whole Western United States is suffering a severe drought situation. The Colorado River basin has received no more than half of its normal amount of rain. The Americans have a plan calling for the implementation of aggressive water conservation measures – the curtailment (or reduction) of water supplies to agriculture and customers other than cities and industry, reducing releases for environmental needs and implementing further water-use reduction measures for all customers under drought contingency plans. The latest projections indicate that the next “trigger point” will be reached on Jan. 1, 2009, causing the cutting off supply to interruptible customers . If weather patterns hold, we’ll likely see further curtailment measures.
The Mexicali Valley receives its water thanks to the 1944 Water Treaty relating to the Colorado River, which provides that the USA will deliver a guaranteed annual quantity of 1,850,234,000 cubic meters. This is more water than has the Israeli Water System. My interlocutors here yesterday appeared unconcerned by any water problem or scarcity or drought or climate change, saying that the USA will always supply them all the water as obliged by the treaty. I hope it is so and they are not in the list of interruptible customers.
The Treaty also provides that the United States shall adopt measures to ensure that the water delivered annually to Mexico upstream of Morelos Dam shall have an average salinity of no more than 115 +30 parts per million over the annual average salinity of Colorado River water arriving at Imperial Dam. The USA has set up a desalination plant at Yuma to provide better water for agriculture, and possibly also to comply with the Treaty. Apparently, the Treaty assumed hat water would be used for power generation, and that the problem was the disposition of surpluses, not prolonged droughts. Nor a change in the climate.
















































