COE maximum cfs on the dams???

[Handicrappie]

Anybody know what is the maximum rate they can let water out if need be? Saw where Grenada was at 5100 and was just curious.


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[Rees Guide]

They can do a little more than that at Grenada, have seen it even with the sidewalk down there and it was prolly 3 feet below that last night.

[Handicrappie]

Guess its safe to say its more than 5100 then..... Next question is how much water does 5100 or more take off the lake a day????


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[Rees Guide]

Took just over 5 inches from Sunday at noon till yesteday at noon, on a stand still now with this rain and will most likely be on a rise at next hours report. This link shows Genada and you can navigte from there to show the others, you can check levels all the way bck to when they were built.
Rivergages.com - Station Information ForYalobusha River @ Grenada Dam (Inlet)

[Handicrappie]

So would it be reasonable to say that for every 1000 cfs the dam is open be equivalent to approximately a .1 off the lake a day?


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[Rees Guide]

Be close but water level comes into play and each lake is different, been watching and logging some stuff in a journal for a couple of years now on Grenada. If the lake is in the 190s that formula works pretty good get to the 205 and up range and its less than that.
With the rivergages link and dated pics I dont have to put as much in the journal, mostly like amp access at water levels and such.

[Pops]

Max flow at Sardis is around 7500 cfs. I don't think COE can do that now with lake near minimum pool. Just not enough water to fill up the outlet tunnel.

[KDAVID1]

agree with Pops. even with the lower flow right now there is a strong current for sure (at the intake that is)

[bfish]

Hydralic capacity is the term you looking for to describe the max. discharge which is 52,000 cfs.

To figure drawdown amount, convert flow (measured in Cubic Feet per Second) in your time period (12 hr or 24 hr) to acre-feet. Acreage of the reservoir at full pool is often listed (9800 acres).

GRENADA DAM DAM (Grenada Lake)

Just quick estimate puts 5200 cfs for 24 hours at about 4-5 inch drawdown (minus any new inflow) for a 10k acre lake.

[Rees Guide]

Not sure that 52000 is possible, pipe was dang near full yesterday with 5100cfs coming out, no way they can get 10 times that much more out unless lake level could push more out when it is high. Cool link, thanks.