Write a function to compute the time to drain a cylindrical tank of diameter D from an initial level 
to a level h. The outflow occurs through a small circular orifice of diameter 
at the bottom of the tank, and the outflow Q can be computed with 
, where 
is a discharge coefficient, 
is the area of the orifice, and g is the acceleration of gravity, which should be taken as 9.81 m/s
.
to a level h. The outflow occurs through a small circular orifice of diameter at the bottom of the tank, and the outflow Q can be computed with , where is a discharge coefficient, is the area of the orifice, and g is the acceleration of gravity, which should be taken as 9.81 m/s. 
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