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I should be using a lateral inflow in a channel routing in HEC-HMS. I applied two planes as my sub-basins and defined a sub-collector.The outflow from the planes is applied to the sub-collector as lateral inflow. until now everything is ok .but HEC-HMS has no routing method parameter for sub-collector. manual says that the surface runoff on the two planes is ALWAYS routed using the kinematic wave method.however, we have the choice of using another method.still, I have no problem.my problem is beginning from this point that I have to fill the information about collector and channel. my model has not any channel or collector. Best Regards,