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Head loss can be found by manipulating the Bernoulli equation as follows:
Ideal fluid: [P1/ρg] + Z1 + [V12/2g] = [P2/ρg] + Z2 + [V22/2g] (assuming no energy loss)
Where P = pressure at the point
ρ = density of the fluid at all points in the fluid.
Z = elevation of the point above some reference plane (i.e. distance from top and/or bottom
surface of the filter media to the bottom reference plane in this case)
V = fluid flow speed at a point on a streamline
Non-ideal fluid: [P1/ρg] + Z1 + [V12/2g] = [P2/ρg] + Z2 + [V22/2g] + H
(Where H = Head loss or energy head)
∴ H = [(P1-P2)/ρg] + (Z1-Z2) + [(V12-V22)/2g]
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