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PROJECT: Calculated by: Date:
FREQUENCY: Checked by: Date:
A I C Q Sum of Q SLOPE SECTION V L Tn Sum of T Volume
Acres in/hr cfs cfs fps ft min min cf
A-1 Undeveloped 1.16 1.45 0.699 1.179 1.179 56' Street 327 9 9 Initial Area 3,155.14
Sanja Perica, Sarah Dietz, Sarah Heim, Lillian Hiner, Kazungu Maitaria, Deborah Martin, Sandra Pavlovic, Ishani Roy, Carl Trypaluk, Dale Unruh, Fenglin Yan, Michael Yekta, Tan Zhao, Geoffrey
Bonnin, Daniel Brewer, Li-Chuan Chen, Tye Parzybok, John Yarchoan
NOAA, National Weather Service, Silver Spring, Maryland
PF_tabular | PF_graphical | Maps_&_aerials
PF tabular
PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)1
DurationAverage recurrence interval (years)
1 2 5 10 25 50 100 200 500 1000
5-min0.095
(0.080-0.115)0.127
(0.107-0.154)0.171
(0.143-0.207)0.208
(0.172-0.253)0.259
(0.207-0.328)0.300
(0.235-0.388)0.343
(0.261-0.454)0.388
(0.287-0.529)0.450
(0.318-0.642)0.499
(0.340-0.738)
10-min0.136
(0.114-0.164)0.183
(0.153-0.220)0.245
(0.205-0.297)0.298
(0.247-0.363)0.372
(0.297-0.470)0.430
(0.336-0.556)0.491
(0.374-0.651)0.555
(0.411-0.759)0.644
(0.456-0.920)0.715
(0.488-1.06)
15-min0.165
(0.138-0.199)0.221
(0.185-0.266)0.297
(0.248-0.359)0.360
(0.298-0.439)0.449
(0.359-0.568)0.520
(0.407-0.672)0.594
(0.453-0.788)0.672
(0.497-0.918)0.779
(0.552-1.11)0.865
(0.590-1.28)
30-min0.259
(0.217-0.311)0.346
(0.290-0.417)0.465
(0.389-0.562)0.565
(0.468-0.689)0.705
(0.563-0.891)0.816
(0.638-1.05)0.932
(0.710-1.24)1.05
(0.779-1.44)1.22
(0.865-1.74)1.36
(0.925-2.01)
60-min0.396
(0.332-0.476)0.530
(0.444-0.638)0.712
(0.595-0.860)0.864
(0.716-1.05)1.08
(0.862-1.36)1.25
(0.976-1.61)1.43
(1.09-1.89)1.61
(1.19-2.20)1.87
(1.32-2.67)2.07
(1.42-3.07)
2-hr0.587
(0.493-0.707)0.769
(0.645-0.927)1.02
(0.850-1.23)1.22
(1.01-1.49)1.51
(1.21-1.91)1.75
(1.36-2.25)1.98
(1.51-2.63)2.24
(1.65-3.05)2.58
(1.83-3.69)2.86
(1.95-4.23)
3-hr0.728
(0.611-0.876)0.948
(0.795-1.14)1.25
(1.04-1.51)1.50
(1.24-1.82)1.85
(1.48-2.33)2.12
(1.66-2.74)2.41
(1.84-3.19)2.71
(2.00-3.70)3.13
(2.21-4.46)3.45
(2.36-5.11)
6-hr1.03
(0.867-1.24)1.35
(1.13-1.62)1.77
(1.48-2.13)2.11
(1.75-2.58)2.60
(2.08-3.28)2.98
(2.33-3.85)3.37
(2.57-4.47)3.79
(2.80-5.17)4.35
(3.08-6.21)4.80
(3.27-7.10)
12-hr1.36
(1.14-1.64)1.80
(1.51-2.17)2.39
(2.00-2.89)2.87
(2.38-3.50)3.53
(2.83-4.46)4.05
(3.16-5.23)4.57
(3.48-6.06)5.11
(3.78-6.98)5.85
(4.14-8.34)6.42
(4.38-9.50)
24-hr1.79
(1.58-2.07)2.44
(2.16-2.83)3.30
(2.91-3.83)4.00
(3.49-4.67)4.94
(4.18-5.96)5.67
(4.70-6.98)6.41
(5.19-8.07)7.16
(5.65-9.27)8.19
(6.21-11.0)8.98
(6.58-12.5)
2-day2.15
(1.90-2.48)3.02
(2.67-3.49)4.18
(3.68-4.84)5.12
(4.47-5.98)6.41
(5.42-7.73)7.41
(6.15-9.12)8.43
(6.83-10.6)9.49
(7.49-12.3)10.9
(8.29-14.7)12.1
(8.85-16.8)
3-day2.32
(2.05-2.67)3.31
(2.92-3.83)4.64
(4.09-5.38)5.74
(5.01-6.70)7.25
(6.14-8.74)8.43
(6.99-10.4)9.65
(7.82-12.2)10.9
(8.62-14.1)12.7
(9.63-17.1)14.1
(10.3-19.6)
4-day2.49
(2.20-2.88)3.60
(3.17-4.16)5.08
(4.47-5.89)6.31
(5.51-7.37)8.02
(6.78-9.67)9.36
(7.76-11.5)10.8
(8.71-13.5)12.2
(9.64-15.8)14.3
(10.8-19.2)15.9
(11.7-22.2)
7-day2.84
(2.51-3.28)4.13
(3.64-4.77)5.87
(5.17-6.81)7.34
(6.41-8.57)9.39
(7.95-11.3)11.0
(9.14-13.6)12.7
(10.3-16.0)14.5
(11.5-18.8)17.1
(13.0-23.0)19.2
(14.0-26.7)
10-day3.02
(2.67-3.49)4.39
(3.88-5.08)6.28
(5.53-7.28)7.87
(6.88-9.20)10.1
(8.57-12.2)11.9
(9.90-14.7)13.8
(11.2-17.4)15.9
(12.5-20.5)18.7
(14.2-25.2)21.0
(15.4-29.3)
20-day3.61
(3.19-4.16)5.30
(4.68-6.13)7.67
(6.75-8.89)9.70
(8.47-11.3)12.6
(10.7-15.2)15.0
(12.4-18.5)17.5
(14.2-22.1)20.3
(16.0-26.2)24.1
(18.3-32.5)27.3
(20.0-38.0)
30-day4.24
(3.75-4.90)6.24
(5.50-7.21)9.05
(7.97-10.5)11.5
(10.0-13.4)15.0
(12.7-18.1)17.9
(14.9-22.1)21.0
(17.1-26.5)24.4
(19.3-31.6)29.3
(22.2-39.4)33.2
(24.3-46.2)
45-day4.93
(4.36-5.69)7.22
(6.37-8.35)10.5
(9.23-12.2)13.3
(11.7-15.6)17.6
(14.9-21.2)21.0
(17.4-25.9)24.8
(20.1-31.2)28.8
(22.7-37.3)34.7
(26.3-46.7)39.5
(29.0-55.0)
60-day5.66
(5.00-6.53)8.22
(7.25-9.50)11.9
(10.5-13.8)15.2
(13.2-17.7)19.9
(16.9-24.1)23.9
(19.9-29.5)28.3
(22.9-35.6)33.0
(26.0-42.6)39.8
(30.1-53.6)45.4
(33.3-63.2)
1 Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS).
Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values.
Please refer to NOAA Atlas 14 document for more information.