# Tank drain time
# Scope: Constant-area tank draining by gravity; no outlet submergence or viscous loss.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

tankArea = 0.2 m^2
holeDiameter = 10 mm
initialHeight = 0.5 m
finalHeight = 0.1 m
coefficient = 0.62
gravity = 9.81 m/s^2

holeArea := pi*holeDiameter^2/4 [m^2]
duration := 2*tankArea*(sqrt(initialHeight)-sqrt(finalHeight))/(coefficient*holeArea*sqrt(2*gravity)) [s]

check drain time budget: duration <= 1200.0 s

scenario alternative: tankArea = 0.16 m^2