time of concentration is based on the hydraulic path with the longest travel time.hydraulic path A was eliminated in the analysis for segment 2-3.total time along path B to inlet 3 is 10 minutes plus the travel time in pipe segment 2-3, which we will assume for now to be 0.5 minutes. Therefore, total time is 10.5 minutes. total time to inlet 3 along hydraulic path C as shown in figure 10-10 is 10 minutes (given). Thus, time of concentration is taken as