The speed of flow v of a liquid through an orifice in the wall of the vessel containing this liquid is given by
P0 - Pressure applied on the surface of the liquid
P - Pressure at the exit of the liquid by the orifice
The flow is given by
S - area of the orifice
m - coefficient of outflow
The time of flow is:
Q - - volume of liquid flowed in the time t
GRAVITY FLOW
S0 - surface area of the liquid flowed
COEFFICIENT OF OUTFLOW
The coefficient of outflow, depends on the geometry of the exit orifice, according to the following table:
FLOW IN CHANNELS
SPILLWAYS
Flow: 
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