Getting there...
If you take a look at the "pump roundup" thread, you'll find lots of graphs. Those graphs indicate what kind of flow you can expect, using different pumps.
All pumps deliver their maximum flow rate when there is no restriction, aka 0 head, aka no pressure drop.
When you put the pump in a cooling loop, there are restrictions, and there is pressure.
The pump will deliver the flowrate that matches the pressure drop on those graphs.
Pressure is measured between two points. For a waterblock, once you've established the flow rate, it's only a matter of calculating the restrictions, in order to come up with a figure, for the expected pressure drop. This pressure drop is between the inlet, and the outlet.
Note that the graphs that come with pumps will give you the pressure drop between the pump inlet and outlet. The total restriction in your rig will be composed of the waterblock, and the rad (tubing is usually not a factor).
So yes, if you give me the inner dimensions of the block, I'll take a shot at calculating the flow restriction. The equation you posted doesn't really have anything to do with it. and I mean that it's not complete.
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