A: Area
C: Flow coefficient (non-dimensional)
d: density ( water density = 1000kg/m³)
D: Diameter
g: Gravity 9.8 m/s²
K: Flow coefficient (dimensional) (Kv)(Cv)
Q: Flow rate
SG: Specific gravity (1 for water)
v: Velocity
Δh: Head Drop (high of fluid)
ΔP: Pressure Drop

v	=	C	� SQRT ( 2 � g �	Δh	)
cm/min cm/s ft/h ft/min ft/s fph fps in/s ips km/h km/s mi/s mi/min mph m/s				cm ft in m mi mm nmi yd