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As a rule of thumb in U.S. water management, one acre-foot is taken to be the planned water usage of a suburban family household, annually. In some areas of the desert Southwest, where water conservation is followed and often enforced, a typical family uses only about 0.25 acre-feet of water per year. One acre-foot/year is approximately 893 gallons (3.38 m³) per day.
The acre-foot (or more specifically the time rate unit of acre-foot per year) has been used historically in the U.S. in many water-management agreements, for example the Colorado River Compact, which divides 15 million acre-feet (MAF) per year or (586 m³/s) among seven western U.S. states.
Elsewhere in the world, where the metric system is in common use, water volumes can be expressed in either cubic metres (as in flow rates of cubic metres/second, or "cumecs") or, for water usage, storage or irrigation volumes, in kilolitres (kL, = 1 cubic metre), megalitres (ML, = 1,000 cubic metres), or gigalitres (GL, = 1,000,000 cubic metres). One acre foot is approximately equivalent to 1,233 cubic meters.
originally posted by: pimptriggs
back in 2008 and 2009 it was this low once before. looks like only 2 or 3 feet in difference,
i would maybe just watch and see if it does go lower than this.
People seem surprised when they learn that human activity can cause quakes, said Leonardo Seeber, a research professor at Lamont-Doherty Earth Observatory at Columbia University, but the cause-and-effect is only common sense.
"It's not surprising that if you change the stress regime, even by a little, you can trigger earthquakes."
Reservoirs are not a small change. Dams make it possible to move vast weight from one place to another. Lake Mead, at its current level, contains more than 16 million acre-feet of water. That's more than 5 trillion gallons of water, at 8 pounds per gallon, or more than 20 billion tons.
Quakes can also be triggered when you take weight off the ground in mining and quarrying. Injecting and extracting vast amounts of water, as is done in hydraulic fracturing operations, can be triggers, Seeber said.
Dams have caused major earthquakes in China and India, he said. "This belief that if you trigger earthquakes, they are going to be small, is simply not true," he said.
Posted May 22, 2015 - 12:01pmUpdated May 23, 2015 - 10:33am
4.8-magnitude earthquake shakes Las Vegas;