Water at \(35^{\circ} \mathrm{C}\) is pumped through a horizontal, \(200-\mathrm{m}\)-long, \(30-\mathrm{mm}\)-diameter tube at \(0.25 \mathrm{~kg} / \mathrm{s}\). Over time, a 2-mm-thick layer of scale of surface roughness \(e=200 \mu \mathrm{m}\) is deposited on the interior tube wall. Determine the pressure drop from the entrance to the exit of the tube and the required pump power for the clean and fouled conditions.