Here's about the best break down I have seen from Leo at Cumberland Transit:
the .7 means the average hourly discharge in cps, so .7 would be 700 cps per hour over a 24 hour period. (16800 cfs over 24 hours)
The sluice gate allows for 250 (+/-) depending on the lake level. so 24 times 250 = roughly 6000 cfs
subtract the 6000 cfs from the 16800 for 24 hours
They are sluicing in addition to the sluice gate while they generate and that is roughly 1500 cfs per hour per gate
so they will generate @ 10800 cfs approximately, one generator is about 3800 CFS if the gate is fully opened
divide 10800 by 3800 = 2.8 hours minus sluicing for 2 hours and it comes out to very close to 2 hours
when figuring that you have to take some things into consideration like assuming that the gates are fully opened when they generate or sluice and that the generation in cfs includes the sluice and that you have to subtract that out of the equation to figure how many hours they will generate. It isn't dead nuts on but it is very close and you can usually get very close on how long they will generate, just not when they will
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