On a network with diffluences (classical on irrigation canals whereas rare for rivers), the calculation of the steady-state water line performs iterations to distribute the flow arriving from upstream into each reach downstream of the diffluence point.

By default, the distribution is initialized from the relative surface of reaches located downstream from the diffluence. When this default distribution would cause negative initial flow rates in some branches of the network, the user can change these settings by double-clicking the node causing the problem and change the distribution of the flow between the diversion reaches leaving from this node.