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Wait, Mexico’s share is (as seems from both your comment and the link) specified in absolute terms rather than as a percentage like the US states? Leaving no allowance for that amount not existing?

More specific link:

https://en.wikipedia.org/wiki/Colorado_River_Compact#Provisi...

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Minute 319 [1] determines how water allocations will change during conditions of drought or surplus. This is also covered a little at the end of the Wikipedia article.

In a max drought scenario (Lake Mead surface elevation <1,025 feet) it looks like delivery requirements would be reduced by 125,000 acre-feet, with different delivery thresholds above that range.

1. https://www.ibwc.gov/Files/Minutes/Min319_Env_Fact_Sheet.pdf

I believe that the water to be supplied to Mexico via the river was of such poor quality that we ended up either trucking or directly purifying a set volume of water downstream to meet our treaty obligations.

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