As for the market, when it approaches water it meets all sorts of obstacles: water is difficult to move, difficult to measure, difficult to price and often difficult to charge for, since many people think it should be free.
The Tennessee Valley Authority said it was taking the unusual flood-prevention measure of spilling 1.5 million gallons of water per second through the Kentucky Dam near Paducah from the Tennessee River into the Ohio River.
The trick is a series of sensors that monitor water levels and measure how quickly they rise.
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Rosemary Butler AM, chair of the legislation committee, raised concerns that the practical implications in relation to the provision and maintenance of a water supply have yet to be fully resolved and its potential impact of the proposed measure on the affordable housing agenda.
In water the temperature changes are a good measure of relative enthalpy changes.
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So the oil-services companies devised techniques (such as the Q-Fin system from WesternGeco and the Nautilus system from CGGVeritas) to measure and adjust the position of the streamers as they travel through the water.
Roughly 1, 200 years later, the Greeks used water dripping through holes in stone vessels to measure the passage of hours.
Mike Maryon, from the council, said that had worked as a temporary measure but was not sufficient to deal with the "amazing" amounts of water at the weekend.
This is already beginning to happen in parts of both India and China, where farmers are learning how to measure the water they pump, how to use it to greatest effect and thus how to sustain aquifer levels.
Beijing has about 100 cubic meters of water available per person, well below the U.N. standard of 1, 000 cubic meters per person, a threshold used to measure chronic water shortage.
In Arkansas, where conditions are the driest they've been since 1925, according to one widely used measure of short-term drought, ranchers have been selling off cattle to avoid having to feed and water them, said Arkansas Department of Agriculture spokesman Zach Taylor.
These are able to measure the spectrum of the light reflected from a cloud so accurately that Dr Rosenfeld could deduce the average size of its water droplets from the amount of light that they reflected.
Several teams of scientists trying to measure how much methane is actually being released have reported seeing vast bubbles coming up through the water - although analysing how much this matters is complicated by the absence of similar measurements from previous decades.
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