Which of the following equations as suggested by Colebrook and White gives the increase in roughness of a new surface (?0) with age/time (t) (where, ? = roughness of the surface after timet. ? = a co-efficient to be experimentally determined) ?

A. ? = ?0 + ?.t4

B. ? = ?0 + ?.t

C. ? = ?0 + ?.t3

D. ? = ?0 + ?.t2

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