Expected return periods (2 months to 100 years)
for Indiana storms with the indicated lifetimes (5 mins to 10 days)

The following table is courtesy of the Midwestern Climate Center



                Sectional Mean Frequency Distributions for Storm Periods of 5 Minutes to 10 Days
                         and Recurrence Intervals of 2 Months to 100 Years in Indiana


                                                Section (Climate Division) code

                                 01     Northwest                  06      Eastcentral
                                 02     Northcentral               07      Southwest
                                 03     Northeast                  08      Southcentral
                                 04     Westcentral                09      Southeast
                                 05     Central
                                 
                                     Rainfall (inches) for given recurrence interval

Section Duration  2-mo    3-mo    4-mo    6-mo    9-mo    1-yr    2-yr    5-yr   10-yr   25-yr   50-yr  100-yr
 01     10-day    2.07    2.50    2.88    3.38    3.89    4.23    4.84    5.79    6.67    8.03    9.23   10.58
 01      5-day    1.68    2.01    2.27    2.63    3.03    3.29    3.84    4.70    5.50    6.81    7.99    9.37
 01      72-hr    1.53    1.80    2.04    2.36    2.71    2.95    3.46    4.24    4.97    6.10    7.17    8.38
 01      48-hr    1.40    1.64    1.83    2.12    2.44    2.65    3.12    3.87    4.56    5.58    6.52    7.58
 01      24-hr    1.33    1.55    1.69    1.96    2.23    2.42    2.89    3.61    4.22    5.22    6.10    7.12
 01      18-hr    1.25    1.45    1.59    1.84    2.09    2.27    2.72    3.39    3.97    4.91    5.73    6.69
 01      12-hr    1.16    1.35    1.48    1.71    1.94    2.11    2.51    3.14    3.67    4.54    5.31    6.19
 01       6-hr    1.00    1.16    1.27    1.47    1.67    1.82    2.17    2.71    3.16    3.91    4.57    5.34
 01       3-hr    0.85    0.99    1.08    1.26    1.43    1.55    1.85    2.31    2.70    3.34    3.90    4.56
 01       2-hr    0.77    0.90    0.98    1.13    1.29    1.40    1.68    2.09    2.45    3.03    3.54    4.13
 01       1-hr    0.63    0.73    0.80    0.92    1.05    1.14    1.36    1.70    1.98    2.45    2.87    3.35
 01     30-min    0.50    0.58    0.63    0.73    0.83    0.90    1.07    1.34    1.56    1.93    2.26    2.63
 01     15-min    0.36    0.42    0.45    0.53    0.60    0.65    0.78    0.97    1.14    1.41    1.65    1.92
 01     10-min    0.28    0.33    0.36    0.41    0.47    0.51    0.61    0.76    0.89    1.10    1.28    1.50
 01      5-min    0.16    0.19    0.20    0.23    0.27    0.29    0.35    0.43    0.51    0.63    0.73    0.85
 

Section Duration  2-mo    3-mo    4-mo    6-mo    9-mo    1-yr    2-yr    5-yr   10-yr   25-yr   50-yr  100-yr
 02     10-day    2.04    2.45    2.83    3.33    3.83    4.16    4.75    5.64    6.45    7.69    8.80   10.03
 02      5-day    1.68    2.01    2.28    2.64    3.04    3.30    3.80    4.62    5.38    6.57    7.63    8.85
 02      72-hr    1.48    1.74    1.97    2.28    2.62    2.85    3.33    4.10    4.79    5.88    6.86    8.00
 02      48-hr    1.37    1.60    1.78    2.06    2.37    2.58    3.02    3.73    4.36    5.36    6.25    7.28
 02      24-hr    1.30    1.51    1.65    1.91    2.17    2.36    2.78    3.43    4.00    4.90    5.67    6.54
 02      18-hr    1.22    1.42    1.55    1.80    2.04    2.22    2.61    3.22    3.76    4.61    5.33    6.15
 02      12-hr    1.13    1.31    1.43    1.66    1.89    2.05    2.42    2.98    3.48    4.26    4.93    5.69
 02       6-hr    0.97    1.13    1.24    1.43    1.63    1.77    2.09    2.57    3.00    3.68    4.25    4.90
 02       3-hr    0.83    0.97    1.06    1.22    1.39    1.51    1.78    2.20    2.56    3.14    3.63    4.19
 02       2-hr    0.75    0.88    0.96    1.11    1.26    1.37    1.61    1.99    2.32    2.84    3.29    3.79
 02       1-hr    0.61    0.71    0.78    0.90    1.02    1.11    1.31    1.61    1.88    2.30    2.66    3.07
 02     30-min    0.48    0.56    0.61    0.70    0.80    0.87    1.03    1.27    1.48    1.81    2.10    2.42
 02     15-min    0.35    0.41    0.45    0.52    0.59    0.64    0.75    0.93    1.08    1.32    1.53    1.77
 02     10-min    0.28    0.32    0.35    0.41    0.46    0.50    0.58    0.72    0.84    1.03    1.19    1.37
 02      5-min    0.15    0.18    0.20    0.23    0.26    0.28    0.33    0.41    0.48    0.59    0.68    0.78
 

Section Duration  2-mo    3-mo    4-mo    6-mo    9-mo    1-yr    2-yr    5-yr   10-yr   25-yr   50-yr  100-yr
 03     10-day    1.81    2.18    2.52    2.96    3.40    3.70    4.25    5.12    5.84    6.96    8.01    9.16
 03      5-day    1.52    1.82    2.06    2.38    2.74    2.98    3.46    4.18    4.81    5.83    6.76    7.80
 03      72-hr    1.35    1.59    1.79    2.08    2.39    2.60    3.01    3.68    4.27    5.21    6.06    7.01
 03      48-hr    1.27    1.48    1.65    1.91    2.20    2.39    2.77    3.38    3.92    4.78    5.57    6.45
 03      24-hr    1.19    1.38    1.51    1.75    1.99    2.16    2.52    3.04    3.52    4.29    5.02    5.77
 03      18-hr    1.12    1.30    1.42    1.64    1.87    2.03    2.37    2.86    3.31    4.03    4.72    5.42
 03      12-hr    1.03    1.20    1.32    1.52    1.73    1.88    2.19    2.64    3.06    3.73    4.37    5.02
 03       6-hr    0.89    1.04    1.13    1.31    1.49    1.62    1.89    2.28    2.64    3.22    3.76    4.33
 03       3-hr    0.76    0.88    0.97    1.12    1.27    1.38    1.61    1.95    2.25    2.75    3.21    3.69
 03       2-hr    0.69    0.80    0.88    1.01    1.15    1.25    1.46    1.76    2.04    2.49    2.91    3.35
 03       1-hr    0.56    0.65    0.71    0.83    0.94    1.02    1.18    1.43    1.65    2.02    2.36    2.71
 03     30-min    0.44    0.51    0.56    0.65    0.74    0.80    0.93    1.12    1.30    1.59    1.86    2.13
 03     15-min    0.32    0.37    0.41    0.47    0.53    0.58    0.68    0.82    0.95    1.16    1.36    1.56
 03     10-min    0.25    0.29    0.31    0.36    0.41    0.45    0.53    0.64    0.74    0.90    1.05    1.21
 03      5-min    0.14    0.17    0.18    0.21    0.24    0.26    0.30    0.36    0.42    0.51    0.60    0.69
 


Section Duration  2-mo    3-mo    4-mo    6-mo    9-mo    1-yr    2-yr    5-yr   10-yr   25-yr   50-yr  100-yr
 04     10-day    2.32    2.80    3.22    3.79    4.36    4.74    5.43    6.47    7.33    8.50    9.48   10.65
 04      5-day    1.85    2.21    2.50    2.90    3.34    3.63    4.24    5.15    5.97    7.25    8.31    9.55
 04      72-hr    1.64    1.93    2.18    2.53    2.91    3.16    3.76    4.53    5.34    6.43    7.45    8.55
 04      48-hr    1.53    1.79    1.99    2.30    2.65    2.88    3.38    4.12    4.75    5.77    6.66    7.65
 04      24-hr    1.45    1.68    1.84    2.13    2.42    2.63    3.12    3.83    4.47    5.39    6.17    7.01
 04      18-hr    1.36    1.58    1.73    2.00    2.27    2.47    2.93    3.60    4.20    5.07    5.80    6.59
 04      12-hr    1.26    1.47    1.60    1.85    2.11    2.29    2.71    3.33    3.89    4.69    5.37    6.10
 04       6-hr    1.08    1.26    1.38    1.60    1.81    1.97    2.34    2.87    3.35    4.04    4.63    5.26
 04       3-hr    0.92    1.08    1.18    1.36    1.55    1.68    2.00    2.45    2.86    3.45    3.95    4.49
 04       2-hr    0.84    0.98    1.07    1.24    1.41    1.53    1.81    2.22    2.59    3.13    3.58    4.07
 04       1-hr    0.68    0.79    0.87    1.00    1.14    1.24    1.47    1.80    2.10    2.53    2.90    3.29
 04     30-min    0.53    0.62    0.68    0.79    0.89    0.97    1.15    1.42    1.65    1.99    2.28    2.59
 04     15-min    0.39    0.45    0.50    0.58    0.65    0.71    0.84    1.03    1.21    1.46    1.67    1.89
 04     10-min    0.30    0.35    0.38    0.45    0.51    0.55    0.66    0.80    0.94    1.13    1.30    1.47
 04      5-min    0.18    0.20    0.22    0.26    0.29    0.32    0.37    0.46    0.54    0.65    0.74    0.84
 

Section Duration  2-mo    3-mo    4-mo    6-mo    9-mo    1-yr    2-yr    5-yr   10-yr   25-yr   50-yr  100-yr
 05     10-day    2.13    2.56    2.95    3.47    3.99    4.34    5.06    6.07    6.96    8.36    9.57   10.86
 05      5-day    1.73    2.07    2.34    2.71    3.12    3.39    3.97    4.86    5.66    6.91    8.07    9.44
 05      72-hr    1.52    1.79    2.02    2.34    2.70    2.93    3.45    4.27    5.04    6.15    7.17    8.31
 05      48-hr    1.42    1.66    1.85    2.14    2.47    2.68    3.18    3.94    4.63    5.65    6.56    7.55
 05      24-hr    1.35    1.57    1.72    1.99    2.26    2.46    2.92    3.64    4.25    5.16    5.95    6.84
 05      18-hr    1.27    1.48    1.62    1.87    2.13    2.31    2.74    3.42    3.99    4.85    5.59    6.43
 05      12-hr    1.18    1.37    1.50    1.73    1.97    2.14    2.54    3.17    3.70    4.49    5.18    5.95
 05       6-hr    1.02    1.18    1.29    1.50    1.70    1.85    2.19    2.73    3.19    3.87    4.46    5.13
 05       3-hr    0.86    1.00    1.10    1.27    1.44    1.57    1.87    2.33    2.72    3.30    3.81    4.38
 05       2-hr    0.79    0.92    1.00    1.16    1.32    1.43    1.69    2.11    2.46    2.99    3.45    3.97
 05       1-hr    0.64    0.74    0.81    0.94    1.07    1.16    1.37    1.71    2.00    2.43    2.80    3.21
 05     30-min    0.50    0.58    0.64    0.74    0.84    0.91    1.08    1.35    1.57    1.91    2.20    2.53
 05     15-min    0.36    0.42    0.46    0.53    0.61    0.66    0.79    0.98    1.15    1.39    1.61    1.85
 05     10-min    0.29    0.33    0.36    0.42    0.48    0.52    0.61    0.76    0.89    1.08    1.25    1.44
 05      5-min    0.17    0.19    0.21    0.24    0.28    0.30    0.35    0.44    0.51    0.62    0.71    0.82
 

Section Duration  2-mo    3-mo    4-mo    6-mo    9-mo    1-yr    2-yr    5-yr   10-yr   25-yr   50-yr  100-yr
 06     10-day    2.13    2.57    2.96    3.48    4.00    4.35    5.00    6.00    6.82    8.30    9.55   11.05
 06      5-day    1.62    1.93    2.19    2.54    2.92    3.17    3.75    4.68    5.50    6.90    8.20    9.68
 06      72-hr    1.45    1.70    1.92    2.22    2.56    2.78    3.30    4.15    4.98    6.06    7.25    8.55
 06      48-hr    1.36    1.59    1.77    2.06    2.36    2.57    3.01    3.73    4.40    5.54    6.55    7.70
 06      24-hr    1.26    1.47    1.61    1.86    2.12    2.30    2.76    3.37    3.89    4.65    5.29    6.05
 06      18-hr    1.19    1.38    1.51    1.75    1.99    2.16    2.59    3.17    3.66    4.37    4.97    5.69
 06      12-hr    1.10    1.28    1.40    1.62    1.84    2.00    2.40    2.93    3.38    4.05    4.60    5.26
 06       6-hr    0.95    1.10    1.20    1.39    1.58    1.72    2.07    2.53    2.92    3.49    3.97    4.54
 06       3-hr    0.81    0.94    1.03    1.19    1.35    1.47    1.77    2.16    2.49    2.98    3.39    3.87
 06       2-hr    0.73    0.85    0.93    1.08    1.22    1.33    1.60    1.95    2.26    2.70    3.07    3.51
 06       1-hr    0.59    0.69    0.76    0.87    0.99    1.08    1.30    1.58    1.83    2.19    2.49    2.84
 06     30-min    0.47    0.54    0.60    0.69    0.78    0.85    1.02    1.25    1.44    1.72    1.96    2.24
 06     15-min    0.34    0.40    0.43    0.50    0.57    0.62    0.75    0.91    1.05    1.26    1.43    1.63
 06     10-min    0.26    0.31    0.34    0.39    0.44    0.48    0.58    0.71    0.82    0.98    1.11    1.27
 06      5-min    0.15    0.18    0.20    0.23    0.26    0.28    0.33    0.40    0.47    0.56    0.63    0.73
 

Section Duration  2-mo    3-mo    4-mo    6-mo    9-mo    1-yr    2-yr    5-yr   10-yr   25-yr   50-yr  100-yr
 07     10-day    2.53    3.05    3.52    4.14    4.76    5.17    5.99    7.29    8.46   10.28   11.91   13.74
 07      5-day    1.96    2.35    2.66    3.08    3.54    3.85    4.54    5.64    6.66    8.25    9.72   11.32
 07      72-hr    1.80    2.11    2.39    2.77    3.18    3.46    4.10    5.12    6.02    7.49    8.79   10.28
 07      48-hr    1.65    1.93    2.15    2.50    2.87    3.12    3.68    4.56    5.35    6.62    7.77    9.08
 07      24-hr    1.52    1.77    1.93    2.24    2.54    2.76    3.27    4.00    4.65    5.66    6.52    7.47
 07      18-hr    1.42    1.66    1.81    2.10    2.38    2.59    3.07    3.76    4.37    5.32    6.13    7.02
 07      12-hr    1.32    1.54    1.68    1.94    2.21    2.40    2.84    3.48    4.05    4.92    5.67    6.50
 07       6-hr    1.14    1.32    1.45    1.68    1.90    2.07    2.45    3.00    3.49    4.24    4.89    5.60
 07       3-hr    0.97    1.13    1.24    1.43    1.63    1.77    2.09    2.56    2.98    3.62    4.17    4.78
 07       2-hr    0.88    1.02    1.12    1.30    1.47    1.60    1.90    2.32    2.70    3.28    3.78    4.33
 07       1-hr    0.71    0.83    0.91    1.05    1.20    1.30    1.54    1.88    2.19    2.66    3.06    3.51
 07     30-min    0.56    0.65    0.71    0.83    0.94    1.02    1.21    1.48    1.72    2.09    2.41    2.76
 07     15-min    0.41    0.48    0.52    0.61    0.69    0.75    0.88    1.08    1.26    1.53    1.76    2.02
 07     10-min    0.32    0.37    0.41    0.47    0.53    0.58    0.69    0.84    0.98    1.19    1.37    1.57
 07      5-min    0.18    0.21    0.23    0.27    0.30    0.33    0.39    0.48    0.56    0.68    0.78    0.90
 

Section Duration  2-mo    3-mo    4-mo    6-mo    9-mo    1-yr    2-yr    5-yr   10-yr   25-yr   50-yr  100-yr
 08     10-day    2.39    2.88    3.32    3.90    4.49    4.88    5.74    6.95    7.99    9.60   11.04   12.64
 08      5-day    1.90    2.27    2.57    2.98    3.42    3.72    4.50    5.54    6.43    7.71    8.88   10.18
 08      72-hr    1.70    1.99    2.25    2.61    3.00    3.26    3.88    4.82    5.65    6.92    7.99    9.14
 08      48-hr    1.61    1.88    2.10    2.43    2.80    3.04    3.61    4.41    5.13    6.18    7.14    8.13
 08      24-hr    1.48    1.72    1.88    2.18    2.47    2.69    3.17    3.90    4.49    5.40    6.15    7.06
 08      18-hr    1.39    1.62    1.77    2.05    2.33    2.53    2.98    3.67    4.22    5.08    5.78    6.64
 08      12-hr    1.29    1.50    1.64    1.90    2.15    2.34    2.76    3.39    3.91    4.70    5.35    6.14
 08       6-hr    1.11    1.29    1.41    1.64    1.86    2.02    2.38    2.93    3.37    4.05    4.61    5.30
 08       3-hr    0.95    1.10    1.20    1.39    1.58    1.72    2.03    2.50    2.87    3.46    3.94    4.52
 08       2-hr    0.86    1.00    1.09    1.26    1.44    1.56    1.84    2.26    2.60    3.13    3.57    4.09
 08       1-hr    0.69    0.81    0.88    1.02    1.16    1.26    1.49    1.83    2.11    2.54    2.89    3.32
 08     30-min    0.55    0.64    0.70    0.81    0.92    1.00    1.17    1.44    1.66    2.00    2.28    2.61
 08     15-min    0.40    0.47    0.51    0.59    0.67    0.73    0.86    1.05    1.21    1.46    1.66    1.91
 08     10-min    0.31    0.36    0.39    0.45    0.52    0.56    0.67    0.82    0.94    1.13    1.29    1.48
 08      5-min    0.18    0.20    0.22    0.26    0.29    0.32    0.38    0.47    0.54    0.65    0.74    0.85
 

Section Duration  2-mo    3-mo    4-mo    6-mo    9-mo    1-yr    2-yr    5-yr   10-yr   25-yr   50-yr  100-yr
 09     10-day    2.35    2.83    3.26    3.83    4.41    4.79    5.62    6.85    7.87    9.42   10.90   12.33
 09      5-day    1.86    2.23    2.52    2.92    3.36    3.65    4.29    5.22    6.06    7.39    8.54    9.90
 09      72-hr    1.67    1.96    2.22    2.58    2.96    3.22    3.87    4.77    5.53    6.75    7.80    8.95
 09      48-hr    1.55    1.82    2.02    2.34    2.70    2.93    3.53    4.40    5.13    6.22    7.19    8.20
 09      24-hr    1.36    1.58    1.73    2.00    2.27    2.47    3.03    3.81    4.42    5.39    6.20    7.12
 09      18-hr    1.28    1.48    1.62    1.88    2.13    2.32    2.85    3.58    4.15    5.07    5.83    6.69
 09      12-hr    1.18    1.38    1.50    1.74    1.98    2.15    2.64    3.31    3.85    4.69    5.39    6.19
 09       6-hr    1.02    1.18    1.29    1.50    1.70    1.85    2.27    2.86    3.32    4.04    4.65    5.34
 09       3-hr    0.87    1.01    1.11    1.28    1.45    1.58    1.94    2.44    2.83    3.45    3.97    4.56
 09       2-hr    0.79    0.92    1.00    1.16    1.32    1.43    1.76    2.21    2.56    3.13    3.60    4.13
 09       1-hr    0.64    0.74    0.81    0.94    1.07    1.16    1.42    1.79    2.08    2.53    2.91    3.35
 09     30-min    0.50    0.58    0.64    0.74    0.84    0.91    1.12    1.41    1.64    1.99    2.29    2.63
 09     15-min    0.37    0.43    0.47    0.54    0.62    0.67    0.82    1.03    1.19    1.46    1.67    1.92
 09     10-min    0.29    0.33    0.36    0.42    0.48    0.52    0.64    0.80    0.93    1.13    1.30    1.50
 09      5-min    0.17    0.19    0.21    0.24    0.28    0.30    0.36    0.46    0.53    0.65    0.74    0.85