Help- Pump Head measure for waterfall

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I'm trying to buy a correct size pump for my waterfall.
I need to measure pump head. Is it the distance between
surface of water and top of the waterfall? or distance between
surface of water and inlet of the waterfall. I have a biofall where inlet
from the pump is about 1.5ft below the top of the watefall and water fills up
bottom to top. Any help would be appreciated...
 
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Head also includes the size and length or your pipe (friction) also the numbers od 45's and 90's you use.
 

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