November Reservoir System Update
Tennessee Valley Authority (TVA)
Posted: 11/1/2010 River NeighborsRain and runoffRain for the first three weeks of October was only 24 percent of normal, but a series of fast-moving storms on Oct. 25 and 26 dumped two to four inches of rain across the Valley. The month ended with a rainfall total of 2.89 inches, which is 97 percent of normal. Rainfall in the eastern Tennessee Valley for the year totaled 34.63 inches at the end of October, which is 7.47 inches below normal. Runoff (the amount of water that reaches the river system when it rains instead of being absorbed into the ground) was 86 percent of normal in the eastern Valley.
Reservoir elevations
|
Tributary Reservoir Elevations¹ |
||
Reservoir |
Nov. 1, 2010 |
Jan. 1 |
South Holston |
1712.1 |
1708 |
Watauga |
1947.7 |
1952 |
Cherokee |
1050.7 |
1045 |
Douglas |
969.5 |
954 |
Fontana |
1670.9 |
1653 |
Norris |
1004.7 |
1000 |
Chatuge |
1920.1 |
1918 |
Nottely |
1766.3 |
1762 |
Hiwassee |
1497.4 |
1485 |
Blue Ridge |
1625.1 |
1668 |
Tims Ford |
885.8 |
873.1 |
Normandy |
868.5 |
864 |
1 Water elevation at the dam in feet above mean sea level
2 Flood-guide elevations show the amount of storage allocated for flood damage reduction during different times of the year. The amount of storage varies with the potential flood threat. Flood-guide elevations are lowest from Jan. 1 through mid March because winter storms are generally larger, occur more frequently, and produce more runoff. Flood-guide elevations increase between mid-March and June 1 as the risk of flooding decreases. They are highest from June 1 through Labor Day to support summer reservoir recreation. After Labor Day, TVA begins the unrestricted drawdown to Jan. 1 flood-guide elevations.
Reservoir operations
From September through
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