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redhawk1974

Blue Catfish
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Posts: 158
Reply with quote  #1 
I understand why Lakes have a draw down each winter but can someone explain why Summersville Lake is so drastic compared to others? I would not think it would have more water flow than some areas such as the New and some others.    Maybe it does but seems odd considering how much larger the lake is. 
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Bum

Brookie
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Reply with quote  #2 
It’s just for flood control downstream... gotta keep charleston above water...
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redhawk1974

Blue Catfish
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Reply with quote  #3 
Most All dams are for flood control and do not draw down that much lol.   Just do not understand why that one has to be so much. 
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Bum

Brookie
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Reply with quote  #4 
Has to relate to upstream drainage area, potential for snowpack runoff, spring storms, etc. potential for terrible flooding... need big empty lake to hold it back
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WVUPSC

Rainbow Trout
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Reply with quote  #5 
As Bum said, reservoirs are drawn down in the winter to accommodate spring runoff without flooding communities below. They fill them in the spring to normal pool levels for recreation, but also so there is sufficient water to release in dry times (summer and fall) for downstream water supply, navigation and water quality. By water quality I mean that pollutant discharge permits are based on min flows in rivers (think sustainable dilution) and these reservoirs help keep flows from going below those minimums in the dry months.
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SuperNatural

Hybrid Striped Bass
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Reply with quote  #6 
Just thought I'd mention... the south holston and watauga dams have been running wide open for almost a month straight...
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Bum

Brookie
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Reply with quote  #7 
Because math...
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cling

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Reply with quote  #8 
Each lake/dam has a very specific required range of operating conditions. For these flood control dams, there is likely a drawdown level that is mathematically determined to be able to contain a XX year flood. There are a lot of factors that come into play to calculate that, such as watershed area, hydrologic network layout, lake storage capacity, and perhaps the storage capacity of other nearby flood control structures.

Summersville is also very steep, meaning the vertical drawdown has to be more dramatic to get the same volume of water capacity, as compared to a lake without such steep sides.





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