Someone has suggested that all the water needed to flood the Earth existed as liquid water surrounding the globe (i.e., a "vapour canopy"). This, of course, is staggeringly (edited word). What is keeping that much water from falling to the Earth? There is a little property called gravity that would cause it to fall.
Let's look into that from a physical standpoint. To flood the Earth, we have already seen that it would require 4.252 x 10^9 km^3 of water with a mass of 4.525 x 10^21 kg. When this amount of water is floating above the Earth's surface, it stored an enormous amount of potential energy, which is converted to kinetic energy when it falls, which, in turn, is converted to heat upon impact with the Earth. The amount of heat released is immense:
Potential energy: E=M*g*H, where
M = mass of water,
g = gravitational constant and,
H = height of water above surface.
Now, going with the Genesis version of the Noachian Deluge as lasting 40 days and nights, the amount of mass falling to Earth each day is 4.525 x 10^21 kg/40 24 hr. periods. This equals 1.10675 x 10^20 kilograms daily. Using H as 16,000 meters), the energy released each day is 1.73584 x 10^25 joules. The amount of energy the Earth would have to radiate per m^2/sec is energy divided by surface area of the Earth times number of seconds in one day. That is: e = 1.735384 x 10^25/(4*3.14159* ((6386)^2*86,400)) = 391,935.0958 j/m^2/s.
Currently, the Earth radiates energy at the rate of approximately 215 joules/m2/sec and the average temperature is 280 K. Using the Stefan- Boltzman 4th power law to calculate the increase in temperature:
E (increase)/E (normal) = T (increase)/T^4 (normal)
E (normal) = 215
E (increase) = 391,935.0958
T (normal) = 280.
Turn the crank, and T (increase) equals 1800 K.
The temperature would thusly rise 1800 K, or 1,526.84 C (that's well above melting temperature of lead). It would be highly unlikely that anything short of fused quartz would survive such an onslaught. Also, the water level would have to rise at an average rate of 5.5 inches/min; and in 13 minutes would be in excess of 6 ft deep.
Finally, at 1800 K water would not exist as liquid.
By Dr. Marty Leipzig at:
*http://www.holysmoke.org/cretins/fludmath.htm