Lake Lanier = 38,000 acres at full pool (From Wikipedia)
1 acre = 43,560 square feet
1 square foot = 144 square inches
Multiplying 38,000x 43,560×144 = 238,360,320,000 square inches
Evaporation varies by temperature, relative humidity, water temperature, wind, and sunlight.
ASSUMING that 1/4” evaporated yesterday:
59,590,080,000 cubic inches floated away in the air.
1 cubic foot = 1,728 cubic inches
Translating to cubic feet,
34,485,000 cubic feet evaporated yesterday
1 cubic foot = 7.48051948 US Gallons
257,965,714 Gallons evaporated yesterday
It reads 258 MILLION Gallons blowing away in the wind.
1 day = 24 hours = 1440 minutes = 86,400 seconds
34,485,000 cubic feet /86,400 seconds=
399 CFS evaporated yesterday !!!!!!!!!!!!!
For perspective on August 13, 2009:
Upper Chattahoochee at Cornielia gauge shows 300 CFS.
Chestatee at Dahlonega gauge shows 100 CFS.
This means that virtually all the water from the Chattahoochee and Chestatee evaporated.