BP originally estimated up to 1,000 barrels (42,000 US gal) a day was leaking from the wellhead. On April 28, NOAA said that the rate was probably five times that initially estimated by BP, i.e. 5,000 barrels (210,000 US gal).
John Amos, a geologist who has worked as a consultant with oil companies on measuring oil spills, said that figure is the “extremely low end” of their estimates, putting a more realistic figure at 20,000 barrels a day.
Other sources using satellite imagery have put that number as high as 25,000 barrels (1,100,000 US gal) a day
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