Quote:
Originally posted by deeppitt
Wow!
I had estimated my flow at about 1700 GPH. I just rebuilt my sump and included a channel where I could measure the water speed. Then, knowing the channel cross-sectional area, I calculated the actual water flow. It came out to be about 2400 GPH.
I just tried this head loss calculator, and it says I should have 2480 GPH! Amazing... the calculator was pretty much dead-on.
Who would have thunk..... 
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Your channel measurement sounds cool, how do you measure the velocity of the water?