Referring to Example 11.11, determine the pipe size (concrete) that would be required to convey the design

Question:

Referring to Example 11.11, determine the pipe size (concrete) that would be required to convey the design flow away from the first inlet. If the minimum pipe size specified by community standards is 12 in., what is the depth of flow in the pipe at peak flow (0.914 cfs)? What is the travel time per 100 feet of pipe?