RETURN FREQUENCIES FOR PRECIPITATION AMOUNTS AT BOISE, IDAHO

return 24 hr precipitation (inches)          actual observed at Boise (1931-1996)
 freq	     Boise    5000 ft   7000 ft					
 100	      2.8      3.4       3.6             5 min       0.34							
  50	      2.6      3.0       3.2	        10 min       0.51
  25          2.2      2.6       3.o		15 min       0.69
  10	      1.8      2.4       2.6		30 min       1.00
   5          1.6      2.0       2.2		60 min       1.12
   2          1.2      1.5       1.8

return 6 hr precipitation (inches)           mean annual precipitation (inches)
 freq        Boise    5000 ft   7000 ft
 100          1.7      2.0       2.1            2800 ft      12.1         
  50          1.5      1.7       1.8            4000 ft      20.0
  25          1.4      1.6       1.7            5000 ft      22.0
  10          1.2      1.4       1.5            6000 ft      25.0
   5          1.0      1.2       1.3            7000 ft      27.0
   2          0.8      0.9       1.0

return 1 hr precipitation (inches)
 freq        Boise    5000 ft   7000 ft
 100          1.0      1.2       1.2
  50          1.0      1.1       1.1
  25          0.8      0.9       0.9
  10          0.7      0.7       0.8
   5          0.5      0.6       0.6
   2          0.4      0.4       0.5

return 30 min precipitation (inches)
 freq        Boise    5000 ft   7000 ft
 100          0.83     0.92      0.97
  50          0.77     0.85      0.87
  25          0.63     0.70      0.71
  10          0.51     0.57      0.63
   5          0.40     0.44      0.47
   2          0.34     0.35      0.38

return 15 min precipitation (inches)
 freq        Boise    5000 ft   7000 ft
 100          0.60     0.67      0.70
  50          0.55     0.62      0.63
  25          0.46     0.51      0.51
  10          0.37     0.41      0.46
   5          0.29     0.32      0.34
   2          0.25     0.25      0.28

return 10 min precipitation (inches)
 freq        Boise    5000 ft   7000 ft
 100          0.47     0.53      0.55
  50          0.44     0.49      0.50
  25          0.36     0.40      0.41
  10          0.29     0.33      0.36
   5          0.23     0.25      0.27
   2          0.20     0.20      0.22

return 5 min precipitation (inches)
 freq        Boise    5000 ft   7000 ft
 100          0.30     0.34      0.36
  50          0.28     0.31      0.32
  25          0.23     0.26      0.26
  10          0.19     0.21      0.23
   5          0.15     0.16      0.17
   2          0.13     0.13      0.14


2/9/03


precip return frequency.txt