F = r·Q·(V2-V1) [N]
r = Density of liquid [kg/m3]
r fresh water = 1000 [kg/m3]
r saltwater = 1025 [kg/m3]
Q = Discharge/ flow rate [m3/s]
V1 = Mean velocity before [m/s]
V2 = Mean velocity after [m/s]
Force is negative, because it is a reaction force
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