According to Chezy's formula, velocity of flow through a pipeline is given by – - (1) $v = m\sqrt{Ci}$ - (2) $v = i\sqrt{mC}$ - (3) $v = C^2\sqrt{mi}$ - (4) $v = C\sqrt{mi}$ - (5) Question not attempted Where m is hydraulic mean depth and i is head lost in friction per unit length and ‘C’ is the Chezy's constant.

Chezy's formula is an empirical formula used in hydraulics to estimate the average flow velocity in open channels and pipes. It is given by: $v = C \sqrt{mi}$ where: - $v$ is the average velocity of flow. - $C$ is Chezy's coefficient, which depends on the roughness of the channel/pipe and the flow conditions. - $m$ is the hydraulic mean depth, which is the ratio of the cross-sectional area of flow (A) to the wetted perimeter (P). $m = A/P$. For a circular pipe flowing full, $m = D/4$, where D is the diameter. - $i$ is the hydraulic gradient, which is the head lost due to friction per unit length of the pipe/channel. $i = h_f / L$, where $h_f$ is the head loss and $L$ is the length.