# With tuberculation of the pipes, roughness of the pipes _______ and carrying capacity of the pipes _______.

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With tuberculation of the pipes, roughness of the pipes _______ and carrying capacity of the pipes _______.
1. increases, increases
2. increases, decreases
3. decreases, increases
4. decreases, decreases

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Correct Answer - Option 2 : increases, decreases

Explanation:

Tuberculation:

It is the formation of mounds of reddish-brown iron-oxide on a pipe's interior. This phenomenon is classified as a type of bacteria-driven corrosion and is typically associated with older iron pipesTuberculation is caused by the action of microorganisms in the pipe medium.

Hazen-William formula to calculate the flow velocity in pipe is

V = 0.85 CH R0.63 S0.54

Where, V = Velocity in m/s

C= Coefficient of hydraulic capacity of the pipe material (Hazen-William's coefficient)

The smoother the pipe, the greater is the value of CH.

R = Hydraulic mean depth

S = Slope of the energy line

The carrying capacities of pipes decrease with time because with the passage of time their surfaces go on becoming rougher.