Paul where do you get your numbers from above
The radius of earth is 6400 km or 4000 miles
You seem to have lost a decimal point :-)
Next 80% of the earth's water is surface water the other 20% is either ground water or atmospheric water vapour.
These are Graces numbers (
http://earthobservatory.nasa.gov/Features/WeighingWater/weighing5.php)
The earth's total amount of water is about 344 million cubic miles made up of
315 million cubic miles is seawater
9 million cubic miles is groundwater
7 million cubic miles is frozen in polar ice caps
From =>
http://en.wikipedia.org/wiki/Current_sea_level_rise
The melting of small glaciers and polar ice caps on the margins of Greenland and the Antarctic Peninsula melt, would increase sea level around 0.5 m. Melting of the Greenland ice sheet or the Antarctic ice sheet would produce 7.2 m or 61.1 m of sea level rise, respectively
So if 7 million cubic miles only lifts see level by 61-70m then it is reasonable to assume 9 million cubic miles of groundwater will only lift it by around same say 80m.
Altogether if the poles all meleted and all the groundwater was lifted we have maxium of 150 meters or 400 ft so just at the top of the pyramids.
Given the ground heights around the middle east there would still be a hell of a lot of land above water.
Thats just going off know facts without any calcs but if you redo and recheck your calcs you should hopefully agree with those figures.