Question: Derive an expression for the time to drain an open hemispherical vessel of radius R from a liquid height H 1 to a liquid height

Derive an expression for the time to drain an open hemispherical vessel of radius R from a liquid height H1 to a liquid height H2 through an orifice of area
if the vessel has an inflow of liquid of constant rate, Q. Is the use of the equation constrained by any system parameters?

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