Determine the flow rate of water at \(25^{\circ} \mathrm{C}\) in a 3000 -m-long pipe of diameter \(20 \mathrm{~cm}\) under a pressure gradient of \(20 \mathrm{kPa}\). Assume a relative roughness parameter of \(2.3 \times 10^{-4}\). Use \(v=0.916 \times 10^{-6} \mathrm{~m}^{2} / \mathrm{s}\) for the kinematic viscosity.