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Which of the following equations as suggested by Colebrook and White gives the increase in roughness of a new surface (ε0) with age/time (t) (where, ε = roughness of the surface after time 't'. α = a co-efficient to be experimentally determined)?

Which of the following equations as suggested by Colebrook and White gives the increase in roughness of a new surface (ε0) with age/time (t) (where, ε = roughness of the surface after time 't'. α = a co-efficient to be experimentally determined)? Correct Answer ε = ε<sub>0</sub> + α.t

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