Georgia Canoe - Kayak PaddlersA website for paddlers maintained by the Georgia Canoeing Association
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| Lake Lanier vs Math |
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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 43,560x144 = 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 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. |
| Last Updated ( Wednesday, 26 August 2009 15:49 ) |
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Comments
Liked the math, and it appears to be absolutely correct. The evaporation rate of 0.25 in./day is very close to typical summertime estimates. Of course, there are some smaller tributaries between the gauges and the lake itself, as well as other streams which flow directly into the lake. These account for the water that Atlanta drinks and for the 3 or 4 CFS that's actually allowed to flow downstream of Atlanta.
To prevent the water from evaporating so rapidly, we could build a "carport" type structure over the lake. And we could probably use the same crews that will build the fence between the US and Mexico. Excellent public works project!
On a more serious note, I enjoyed paddling with you Saturday. You mentioned that you had posted an article about your pump installation, but I can't seem to find it. Can you tell me how to get to it?
Thanks.
Tom