Mike, the beauty of your forum is that it is full of instant classics. If you can elaborate on the sixth order polynomial expression for volume flows, that would be particularly appreciated. However, if it is proprietary, I understand.

It could also be helpful with respect to the real time 20 day MF because final separation volume to determine LEV/SEV is not known until the EOD. If it could be estimated throughout the day, it might improve the accuracy of the intraday readings.

Also, you mentioned that linear extrapolation was not suitable. This makes sense if the procedure is to take the first 30 minutes of volume and assume that each of the following periods will contain the same volume. However, one thing I've experimented with is to measure the percent deviation of volume for the current day, x minutes into the day, from the average volume for the first x minutes going back y days. Then, apply that percent deviation to the average EOD volume for the prior y days to get an estimate of the current day's EOD volume.