total time to inlet 2 along hydraulic path A as shown in figure 10-10 is 6.0 minutes plus the travel time in pipe segment 1-2. For the purpose of this example, assume this travel time is about 0.1 minute. Therefore, total time is 6.1 minutes. However, total time to inlet 2along hydraulic path B as shown in figure 10-10 is 10minutes (given). Thus, time of concentration is taken as