Twenty years of annual maximum rainfall depths are given below. Determine the rainfall depths to be used for storm structure design for the following annual return periods: 2, 5, 10, 25, 50, & 100 year.
15 min. rainfall
2.06 1.27 1.01 1.10
1.36 1.31 1.06 1.07
1.10 1.08 1.16 1.70
1.16 1.08 1.02 1.14
1.00 0.97 1.13 0.98