Alternate solution:
If you have those flow meters, then transfer a measured
qty of water through them again, note measurments. Repeat an
odd number of times (5+) with increasing known qty of water.
Plot your numbers, extrapolate the curves (which should be
more or less linear), and a little bit of spreadsheet magic
and there you go ...
I don't know if this is practical or not. I can help you with
the number crunching, if needed.
Sajjad
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