Posted by jd on August 26, 2005 at 16:04:50:
In Reply to: Re: TN river speed? posted by cob on August 26, 2005 at 09:46:09:
I don't reckon math was your favorite subject in school? hehe. Ok, from a quick look at a USGS quad map, the river is approximately 1300 feet wide below G-dam. I think an average depth of 17 feet is fair. Therefore, the area is 22,100 CF. A good average TVA flow in the area seems to be 40,000 CFS. Therefore, the speed is 40,000/22,100 or 1.81 ft/sec. As your GPS might tell you if you were a particle of water, you are going 1.23 miles per hour. Since this is average velocity, it will be higher at the surface and lower at the bottom. Your GPS from your boat will not give you the water speed, but rather, your drift speed. That considers friction and drag which is sure enough a tough calculation that would require lots of assumptions and be useless.
In summary, I think SURFACE speed of 2 mph downstream from a dam where complete mixing has occurred should be close enough. Let us know if this somehow leads to the catch of a lifetime!!
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