Determines non standardized diâmeters for the pipe sections, that assure equal velocities in all of them. Two calculations possibilities are offered: (a) from each section, two exit pipes emerge, or (b) une exit pipe emerges. Given: the water temperature, the flow to be distributed, the number of sections (up to 12) the upstream section diameter, the exit pipes diameter and the pipes internal roughness, determines: a) the flow, velocity and velocity gradient for each exit pipe; for each section of the distribution pipe: the flow, diameter, velocity and velocity gradient.